Warm Light Research Articles

High color rendering index WLEDs enabled by multi-band tuning of InP quantum dots

Quantum dots (QDs) represent a significant class of fluorescent materials, offering the potential to reduce power consumption and enhance the color rendering index (CRI) of white light-emitting diode (WLED) devices. However, the presence of toxic elements such as Cd and Pb in traditional fluorescent QDs limits their widespread commercial application. Compared to the broad emission characteristics of environmentally friendly AgInS2 and CuInS2 QDs, the narrower linewidth of InP-based core-shell QDs is advantageous for developing WLED devices with a higher CRI. In this study, we employed a multistage heating method to synthesize a series of amino-phosphine-based InP/ZnSe core-shell QDs, which exhibited emission wavelengths ranging from 535 to 650 nm, narrow emission linewidths of 43-47 nm, and high photoluminescence quantum yields of 60%-80%. Subsequently, six different color QDs are used to fabricate a WLED device. The best WLEDs show not only bright warm light (correlated color temperature = 3323 K) with a maximum luminous efficacy of 74.1 lm W-1, but also excellent color quality (CRI Ra = 93, as well as R9 = 94.8, and R13 = 97.1). These results indicate remarkable progress in InP-based WLEDs for high-quality lighting applications.

Impacts of human behaviors involving sound and light exposure in sleep environments on sleep and mental disorders: A cross-sectional study

Creating an optimal sleeping environment is essential. Few studies have examined how common individual behaviors alter the daily sleep environment and the subsequent health impacts of these changes among the general population. This study presented a cross-sectional analysis of 13,157 Chinese college students, utilizing binomial logistic regression models and mediation effect analysis to elucidate the associations between human behaviors involving sound and light exposure in sleep environments and outcomes related to sleep disorders, depression, and anxiety. Our results indicated that noise exposure, listening to white noise and content-based audio (audiobooks, crosstalk, and radio) before sleep, watching electronic screens in a dim environment, using noise-canceling tools during sleep, adjusting room light to be on during sleep, and using light-blocking tools during sleep was associated with an increased risk of sleep disorders by 54.9–343.4 %. The risk of mental disorders increased by 0.325–4.379 times. Pathetic (odds ratio (OR) = 1.568) and stirring music (OR = 1.279) were associated with a higher risk of sleep disorders, while gentle music was correlated with a lower risk (OR = 0.842). Additionally, warm light and gentle/cheerful music were associated with lower depression and anxiety risks (OR = 0.635–0.733). Sleep quality was found to partially mediate the relationship between these human behaviors and mental disorders, and mental disorders also mediated the relationship between these behaviors and sleep disorders. The research findings offer a scientific foundation for optimizing sleeping environments through behavior control.

Carbon quantum dots derived from rice straw doped with N and S and its nanocomposites with hydroxypropyl cellulose nanocomposite

As biomass, rice straw (RS) is often valorized as a precursor of green products. In this respect, the RS-based carbon quantum dots (CQDs) are synthesized doped with N and S during the preparation. Synergistic doping with lipoic acid and ethylenediamine can vastly increase the yield of CQD from rice straw from 6.14 % to 62.8 %, and sulfur doping plays a more important role on the surface functional groups of the quantum dots. Further assessment is achieved toward the performance of SN-CQDs-hydroxypropyl cellulose nanocomposites. The optical behavior of synthesized SN-CQDs, and the critical concentration of its liquid crystal behaviors, at which the anisotropic phase begins to emerge, is approximately 1 %. Incorporating it into HPC, especially at 5 %, provided nanocomposite films with effective liquid crystal, tensile strength, and thermal stability. This sample's texture reveals a planar structure with colors ranging from yellow to red. The synergistic effect of incorporating SN-CQDs is shown by improving the strength to ~282.1 %, and the activation energy increased from 583.6 kJ.mol−1 to 615.1 kJ/mol. HPC-SN-CQDs can be assembled into an LED device, emitting warm light, of which CIE coordinate is (0.34,0.43).

A novel Na2Ca2Si3O9: Tb3+ glass ceramic with high luminescence efficiency and robust thermal stability for white LED lighting application

Given the increasing demand for white light emitting diode (WLED) lighting devices marked by high color rendering indices (CRI) and exceptional thermal stability, there is a burgeoning interest in developing emitters with enhanced performance. Rare earth (RE) ion-activated glass ceramics (GCs) have garnered significant attention due to their outstanding physicochemical and thermal stability, alongside their high luminescence efficiency. In this study, the GCs doped with Tb3+ ions in the Na2O-CaO-SiO2 system matrix were synthesized, incorporating Na2Ca2Si3O9 nanocrystals averaging less than 100 nm in size. Notably, these GC materials demonstrated superior luminescence efficiency in the green light emission under the irradiation of 376 nm light compared to the parent glass. A comprehensive analysis of fluorescence spectra revealed an impressive internal quantum efficiency of 87.34 % for this Tb3+-doped GC. Furthermore, the GC retained 90 % and 84 % of the initial luminescence intensity at 150 °C and 200 °C in comparison to the luminescence level at room temperature, showcasing exceptional resistance to fluorescence thermal quenching. Verification experiments utilized UV LED chip, (Sr, Ca)AlSiN3: Eu2+ red phosphor, BaMgAl10O17: Eu2+ blue phosphor, and Tb3+-doped GC to encapsulate the WLED device, achieving a remarkable CRI of 92, CIE chromaticity coordinates (0.3547, 0.3361), and a correlated color temperature (CCT) of 4550K. In conclusion, the experimental outcomes unequivocally underscore the significant application potential of these Tb3+-doped GCs in the territory of warm WLED lighting.

Highly Efficient Red Emission from Novel Sm3+ Doped Na3La(PO4)2 Nanophosphors for Optoelectronic Applications.

Solution combustion procedure was used to create a succession of Na3LaxSm1 - x(PO4)2 (x = 0.01-0.15mol) nanocrystals that generate a warm deep reddish light. Both HR-TEM and X-ray diffraction examinations were used to examine the morphology and crystalline phase analysis. Energy-dispersive X-ray analysis (EDAX) approves the elemental examination. The luminescence spectrum exhibits a decent reddish-orange emission at 700nm wavelength upon near-UV illumination, which aligns with the electronic transition 4G5/2 → 6H11/2. According to Dexter's idea, nearest neighbor interlinkages are responsible for the concentration quenching that occurs after the Sm3+ ion composition reaches 6 mol%. Additionally, a detailed evaluation of the radiative lifespan (0.7519 ms), quantum efficiency (77%), Non radiative rate (307.40), color temperature (3170K), color purity (99.2%) and color coordinates (0.652, 0.338) was conducted. The optical characteristics that have been observed indicate that Sm3+ doped Na3La(PO4)2 phosphors could be a good option for improving WLED efficiency and color quality.

Warm red light emitting Eu(III) complexes synthesis and analysis including computational methods for photonic applications

Six luminescent europium organic complexes have been synthesized and studied for their luminescent properties. The synthesized complexes were analyzed through elemental analysis, XRD, SEM, EDAX, FT-IR, NMR and thermogravimetry. The complexes exhibit crystalline behavior and possess decent thermal stability. Photoluminescence study on complexes were conducted in both solid and solution states, the results indicate the characteristic red emission. With the addition of ancillary ligands, water molecules are replaced from inner coordination sphere, leading to enhanced luminescence properties. The colorimetric parameters (CIE, CP%, CCT, u′, v′) suggest aptness of these complexes in red light illuminating OLEDs. The J-O parameters were calculated experimentally and theoretically with the help of LUMPAC software. Theoretical and experimental results agree well reflecting the efficacy of the outcomes. As a result of red emission, these complexes could have interesting photonics applications. The biological studies indicate the probable use of these complexes in the medical industry.

A bright red low symmetry nine-coordinate Eu3+ complex: Synthesis, crystal structure and photophysical studies

This paper reports a novel crystallographically characterized Eu3+ complex, [Eu(fod)3(terpy)] (fod = anion of 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione and terpy = terpyridine). The single crystal XRD result shows that the Eu ion have a nine-coordinated structure where Eu is attached to six oxygen atoms of three fod ligand and three nitrogen atoms of one terpyridine ligand with a coordination polyhedron as EuO6N3. The paramagnetic NMR result is in line with SC-XRD and confirms the same coordination structure of the complex in solution as well. The photophysical properties were studied in solid state, solution and as a thin film. The band gap value of the complex is determined which is found to be in the range of semiconductors, suggesting application of complex in optoelectronics. Upon excitation with UV-radiation, the complex displays characteristic emission transitions of europium ion. The complex shows high experimental emission lifetime in solid state which suggests that the antenna affect is effective in the present complex. Finally, various color parameters of the complex were calculated and the CCT value reveals the complex as a warm light source.

Light-driven incubation of Fusarium species and near-infrared spectroscopy for an early in vitro identification of Fusarium circinatum

This study explores the application of near-infrared (NIR) spectroscopy coupled with multivariate techniques for the rapid and accurate identification of four Fusarium species, with emphasis on the detection of Fusarium circinatum, the causative agent of “Pitch canker” disease in forests, cultured in vitro under distinct light conditions. The impact of two different incubation conditions, near-ultraviolet (NUV) and warm light, on the spectral characteristics of cultures was used as a strategy to improve the early fungal detection using spectroscopy. Spectral data were acquired using a portable NIR spectrometer at 48, 72, and 96 h post-cultivation from various zones of mycelial growth. The results showed distinct spectral profiles among Fusarium species, with notable variations depending on incubation light conditions and growth zones. NUV light conditions significantly improved species differentiation, especially in the central and middle zones of mycelial growth at 72 h post-cultivation (hpc). Partial least squares − discriminant analysis (PLS-DA) model under NUV light conditions provided the best identification strategy, achieving correct classification rates over 97% for all four species from 72 hpc and 82.5% of correct classification of F. circinatum. These findings demonstrate the effectiveness of the NIRS methodology supported with multivariate techniques and combined with optimization of light conditions and mycelial growth zone of cultures, for the early and rapid detection of Fusarium species in culture media, with potential implications for plant pathology diagnostics and disease management strategies.

Influence of uncomfortable environmental conditions on odor detection thresholds for n-butanol determined with a dynamic dilution olfactometer and in room air

Odor guide values (OGV) are used when a person is exposed to an odor in a room and complains about odor annoyance. OGV are derived from odor detection thresholds (ODT) measured under standard environmental conditions. The study question was whether uncomfortable environmental conditions alter odor perception and should therefore be considered when applying OGV. ODT for n-butanol were determined with an olfactometer and in room air. Twenty healthy, non-smoking volunteers (10 women/10 men, 19–50 years) were selected and trained compliant with the European Standard for Olfactometry EN 13725:2022. Standard conditions were an average temperature between 22 °C and 23 °C, warm light (2800 Kelvin), quiet fan noise (45 dB), 415 ppm carbon dioxide (CO2), and relative humidity between 34 % and 42 %. On each test day, one of five conditions was examined: high temperature (26°C), cold light (6500 Kelvin), traffic noise (70 dB with peaks up to 85 dB), 1000 ppm CO2 and 4000 ppm CO2. Comparability of log-transformed ODT values was assessed by Bland-Altman plot analysis. None of the five conditions systematically affected ODT, either when measured with an olfactometer or in room air. Compared to standard conditions (Limits of Agreement (± LoA) 1.03), the variability of ODT was higher at high temperature (± LoA 1.70) and traffic noise (± LoA 1.45), but not at cold light (± LoA 1.02), 1000 ppm CO2 (± LoA 0.87) or 4000 ppm CO2 (± LoA 0.93). The results show that OGV can be used in uncomfortable environmental conditions. However, because ODT were lower or higher in a few subjects at high temperatures and traffic noise, individual occupant’s perception of temperature and noise should always be considered when applying the OGV concept. Furthermore, the results confirm that the experimental determination of ODT should be performed under controlled and standardized environmental conditions.

Behaviour quantification of Sm3+ in borotellurite glass phosphors for warm-colour illumination

Lighting in unconventional environments is closely related to eye health and circadian rhythms, making it essential for warm-colour light sources to align with technological advancements in solid-state lighting. Herein, warm light in spectral region over 550 nm is realised in Sm3+ doped multicomponent borotellurite (MBT-Sm) glass phosphors as colour converters for LEDs/LDs and their luminescent behaviours are quantified in detail. MBT-Sm glass phosphors standout for their high transparency and the large absorption/emission cross-section, with high quantum efficiency of 84.1 % and quantum yield of 19.15 % under violet LED excitation, and a high luminous flux of 3.33 lm under 50 mW laser. Remarkably, it not only possesses superior colour performance with the correlated colour temperature below 2000 K and colour purity up to 99.8 %, but also shows excellent heat resistance of luminescence. MBT-Sm glass phosphors show promising applications as colour conversion materials in innovative lighting technology.

Exploring the role of neutral ligands in modulating the photoluminescence of samarium complexes with 1,1,1,5,5,5-hexafluoro-2,4-pentanedione.

Four eight-coordinated luminescent samarium complexes of type [Sm(hfpd)3L2] and [Sm(hfpd)3L'] [where hfpd = 1,1,1,5,5,5-Hexafluoro-2,4-pentanedione L = tri-octyl-phosphine oxide (TOPO) and L' = 1,10-phenanthroline (phen), neocuproine (neoc) and bathocuproine (bathoc) were synthesized via a stoichiometrically controlled approach. This allows for precise control over the stoichiometry of the complexes, leading to reproducible properties. This investigation focuses on understanding the impact of secondary ligands on the luminescent properties of these complexes. Infrared (IR) spectra provided information about the molecular structures, whereas 1H and 13C nuclear magnetic resonance (NMR) spectra confirmed these structural details along with the coordination of ligands to trivalent Sm ion. The UV-vis spectra revealed the molar absorption coefficient and absorption bands associated with the hfpd ligand and photoluminescence (PL) spectroscopy demonstrated intense orange-red emission (648 nm relative to 4G5/2 → 6H9/2) from the complexes. The Commission Internationale de l'Éclairage (CIE) triangles indicated that the complexes emitted warm orange red light with color coordinates (x, y) ranging from (0.62, 0.36) to (0.40, 0.27). The investigation of the band gap as well as color parameters confirms the utility of these complexes in displays and LEDs.

MIRROR MAGIC: REFLECTING INNOVATION FOR EVERYDAY CONVENIENCE USING RASPBERRY PI

Smart is not an adjective anymore, Now it is an used for anything that improves functioning in multi-device environment, by simplifying our daily tasks by speeding up the information flow and allowing us to do incredible tasks in the twinkling of an eye. A smart mirror is a two-way with an electronic display behind the glass. The display can show the viewer different kinds of information in the form of widgets, such as weather, time and date and news updates. This project would be useful for busy individuals that want to multitask and stay informed while on the go.The basic design of smart mirror starts with two-way glass is the recommended types as it lets the graphics on the display come through clearer. Upon uploading the code to the device from android studio, all the prototypes and design that we have installed in the design module will be displayed. The electrical component to our project was a simple 19mm Computer monitor mounted to the back of the see through glass. In addition to, installation of PIR on and off sensor to different motion atmospheres is added. And an LED strip around the smart mirror comes with multiple luminosity levels from cool to warm light. The Google voice assistant feature has been implemented to control device with spoken commands. All of this works with Raspberry pi 3 A+ model which is a single board computer. To install the raspbian OS a micro SD card is needed prepared with an OS image all that will be running on the mirror will be coded on the same device at least a keyboard, mouse are required. One mode of interaction with smart is through the microphones. All the coding are written in python which most popular in the Raspberry pi community and it has all the libraries Mirror OS is the software we created for the smart mirror’s interface and it runs on the Raspbian (LINUX) ontop if the electron. The device must be connected to the Wi-fi in order to gather the data through online services.When every device such as phone, watch, TV, speaker has their smart versions, it doesn’t come as a surprise that mirrors they become smart too. KEYWORDS: IOT, PIR, RASPBERRY-PI, RASPBIAN OS, LINUX

Photoluminescence investigation of novel red emitting NaLa(1-x)MgTeO6: XSm3+ phosphor with high color purity for n-UV based warm WLEDS and anti-counterfeiting applications

Recently, red phosphors are extensively developed to find applications in phosphor converted white LEDs (pc-WLEDs) and anti-counterfeiting. In this work, samarium doped sodium lanthanum magnesium tellurate (NaLaMgTeO6:Sm3+) red emitting phosphors have been synthesized for the first time via solid state reaction method. Rietveld refinement of XRD pattern reveals monoclinic crystal structure of NaLaMgTeO6. Under 404 nm (6H5/2 → 4F7/2) n-UV excitation, NLMT:Sm3+ phosphor shows red emission at 643 nm (45/2 → 69/2) with color purity 100 % and the obtained CCT value corresponds to warm light source. Temperature-dependent PL analysis of NLMT:Sm3+ exhibits good thermal stability. The anti-counterfeiting security ink was developed using optimized phosphor and the information was encrypted on different surfaces using the prepared security ink. The encrypted data was decoded only by n-UV light. The aforementioned results revealed that NLMT:Sm3+ is a highly effective phosphor as a red component for pc-WLEDs and luminescent dye for anti-counterfeiting applications.

Synthesis and Spectroscopic Investigations of Sm3+ Activated ZrO2 and Na2ZrO3 as Warm Light Phosphors.

In this work, we investigate how the structural and optical characteristics of ZrO2 and Na2ZrO3 are influenced by Sm3+ ion doping. Urea-assisted combustion approach is employed by varying the molar concentration of Sm3+ ions in both the host lattices. XRD pattern revealed the monoclinic crystal system for both samples. XPS investigation has been examined to acquire the chemical information of the samples. FESEM is used to identify the morphology of the samples. The optimum molar concentrations of Sm3+ doped ZrO2 and Na2ZrO3 phosphors, as per photoluminescence (PL) findings, are 1.5mol% and 2mol%, respectively. CIE coordinates of ZrO2:Sm3+ and Na2ZrO3:Sm3+ are found to be (x = 0.59, y = 0.41) and (x = 0.61, y = 0.39) that corresponds to the amber region of color gamut. The optical bandgap for the synthesized samples is estimated using the UV-Vis diffuse reflectance spectra and the obtained values for the optimal concentration of dopant (Sm3+) in the ZrO2 and Na2ZrO3 samples are 4.61 and 4.94eV, respectively. The findings of the study reveal that the synthesized phosphors may be utilized as warm light phosphors and be a promising candidate for amber light-emitting diodes (LEDs).

Socially inclusive Lighting Design: exploring a method to enhance freedom of movement for marginalised groups.

Based on literature and field research, women and marginalised groups often experience unwanted attention in the public realm worldwide. This attention often produces a gendered fear, which can result in avoidance behaviour of urban public places. Universal design has been implemented to ensure everyone can access urban areas, but this access is still restricted for many vulnerable groups. This investigation aims to find relevant lighting design principles for making public urban spaces more inclusive for all marginalised groups. A literature review, case studies of three urban places, focus group interviews, and an experiment with torches in the field were the chosen methods to gain knowledge. The findings suggest that the participants experience fear in public places when they feel exposed as someone who can become a potential target. This results in a need to see their surroundings and have an awareness of the presence of others. In addition, the experiment showed how they wanted to use warm lighting and beautify the place by enhancing details. The conclusion suggests six different lighting design methods to create inclusive public areas, such as beautifying details and legibility with vertically lit surfaces. These six principles could make urban public places more socially inclusive for marginalised groups, women, and other vulnerable groups. The results should be compared and confirmed by using control groups with other non-marginalised groups.

Mn2+ doped SrSn(PO4)2 nanopowder for new novel LED material

In the current work, SrSn(PO4)2 with Mn2+ doped nanopowder was prepared by solid state reaction method at temperature 950 K. Mechanically, the equipped nanopowder was characterized by structural, spectral, optical, and luminescence investigations. Crystallite size, phase of the sample was explained by powdered XRD analysis. SEM and HR-TEM analyses provided information about the average particle size of nanopowder, while EDS analysis confirmed elemental composition. The selected area electron diffraction (SAED) pattern confirmed the sample crystalline nature by means of rings corresponding to its XRD planes. FTIR study was explained by fundamental symmetric and asymmetric modes of vibrations. Optical absorption spectrum exhibited the typical Mn2+ bands in visible region. EPR studies revealed the distorted octahedral site symmetry for Mn2+. PL spectrum showed less intense emission region. The evaluated CIE co-ordinate values indicate color precipitation and CCT value is greater than 5000k which reveals that the present Mn2+:STP is useful for warm light LED applications.

Tunable emission and energy transfer of Sm3+/Eu3+ activated/ co-activated Mg21Ca4Na4(PO4)18 phosphors for warm light emitting diodes and display applications

Tunable emission and energy transfer of Sm3+/Eu3+ activated/ co-activated Mg21Ca4Na4(PO4)18 phosphors for warm light emitting diodes and display applications

Synthesis, luminescentand computational analysis of red light emitting Eu (III) organic complexes for OLEDs

Six novel red photoluminscent eight co–ordinate Eu3+ complexes were synthesized by using 6–Chloro–chromone–3–aldehyde as main ligand (L) which are represented as [Eu(L3).X] where X is 2H2O (C1), 1,10-Phenanthroline (C2), Neocuproine (C3), 2,2′-Bipyridyls (C4), 5,6-Dimethyl-1,10-Phenanthroline (C5), Bathophenanthroline (C6). The above complexes synthesized by solution precipitation method were characterized by elemental analysis, EDAX analyzer to describes the presence of C, H, O, Cl and Eu. Scanning electron microscope (SEM) to indicates semicrystalline nature of complexes, transmission electron microscopy (TEM) to describes size of complexes lies in 55 to 60 nm, nuclear magnetic resonance (1H NMR) and infrared radiation (FT-IR) to describe the coordination between Eu3+ ion and ligand and ancillary ligands. Thermo-gravimetric analysis (TGA/DTA) tells that complexes are stable upto 290 °C, and photoluminescence (PL) analysis. By using PL data and luminescence decay time (τ), the transition rates, quantum efficiency and the Judd-Ofelt intensity parameters were determined. The luminescence emission spectra for complexes in both states show an intense emission peak (5D0→7F2) at 614 nm (solid) and at 613 nm (solution) of Eu3+ which is responsible to make them an efficient red color emitter in luminescent devices. These complexes are applicable in light emitting devices, traffic signals and home appliances. Percentage branching ratio (βr) and CIE color coordinates value of all synthesized complexes in both states were analyzed. The value of Percentage branching ratio (βr) is 79.92–84.65 % in solid state whereas in solution state the value lies in range 49.37–75.37 % and values of percentage branching ratio (βr) suggests that these complexes are used in lasers and radars systems. The color purity [CP(%)] values are found to be 92.96–94.31 % in solid and 81.24–93.70 % in solution. The band gap is calculated and found to be in the range of 3.7–3.9 eV and used in semiconductor and electroluminescent devices. The complexes (C1–C6) are considered as warm light source because the complexes heaving values of correlated color temperature (CCT) in between 2785 and 3024 K in solid state and 1734 to 2912 K in solution state, which can be efficiently used in LEDs present in hotels, lounges and in many home appliances. The above investigation suggests that synthesized complexes are significant emitters with broad area of utility in laser, electroluminescent materials and display devices.

Impact of ZnO on spectroscopic and luminescence characteristics of Sm2O3–SrO–B2O3 glasses for warm reddish orange light emitting applications

Sm2O3–SrO–B2O3 glasses containing ascending ratios of ZnO were created via the standard melt quenching approach. The optical and luminescent properties were assessed by analysing absorption, reflectance, excitation, and emission spectra obtained from measurements. The density, molar volume, metallization criterion, optical basicity, optical bandgap, Urbach energy, and dispersion parameters were evaluated and discussed. The spectral radiative transitions of the Sm3+ ion in different excited states were investigated using the Judd–Ofelt (J–O) theorem. The least square fit method was used to evaluate the J–O intensity parameters, which were subsequently utilized to determine radiative characteristics including transition probability, branching ratio, and lifetime. For all glasses, the reddish orange transition 4G5/2 → 6H7/2 demonstrated the highest strength and had the maximum values for stimulated emission cross section, radiative transition probability, and gain bandwidth. The chromaticity coordinates fell within the reddish orange region and the colour correlated temperatures ranged from 1840 to 1935 K, suggesting the suitability of the glasses for warm reddish orange emission-based laser and photonic applications.

The Impact of Light Conditions on Neural Affect Classification: A Deep Learning Approach

Understanding and detecting human emotions is crucial for enhancing mental health, cognitive performance and human–computer interactions. This field in affective computing is relatively unexplored, and gaining knowledge about which external factors impact emotions could enhance communication between users and machines. Furthermore, it could also help us to manage affective disorders or understand affective physiological responses to human spatial and digital environments. The main objective of the current study was to investigate the influence of external stimulation, specifically the influence of different light conditions, on brain activity while observing affect-eliciting pictures and their classification. In this context, a multichannel electroencephalography (EEG) was recorded in 30 participants as they observed images from the Nencki Affective Picture System (NAPS) database in an art-gallery-style Virtual Reality (VR) environment. The elicited affect states were classified into three affect classes within the two-dimensional valence–arousal plane. Valence (positive/negative) and arousal (high/low) values were reported by participants on continuous scales. The experiment was conducted in two experimental conditions: a warm light condition and a cold light condition. Thus, three classification tasks arose with regard to the recorded brain data: classification of an affect state within a warm-light condition, classification of an affect state within a cold light condition, and warm light vs. cold light classification during observation of affect-eliciting images. For all classification tasks, Linear Discriminant Analysis, a Spatial Filter Model, a Convolutional Neural Network, the EEGNet, and the SincNet were compared. The EEGNet architecture performed best in all tasks. It could significantly classify three affect states with 43.12% accuracy under the influence of warm light. Under the influence of cold light, no model could achieve significant results. The classification between visual stimulus with warm light vs. cold light could be classified significantly with 76.65% accuracy from the EEGNet, well above any other machine learning or deep learning model. No significant differences could be detected between affect recognition in different light conditions, but the results point towards the advantage of gradient-based learning methods for data-driven experimental designs for the problem of affect decoding from EEG, providing modern tools for affective computing in digital spaces. Moreover, the ability to discern externally driven affective states through deep learning not only advances our understanding of the human mind but also opens avenues for developing innovative therapeutic interventions and improving human–computer interaction.