Illumination Applications Research Articles

Spatially and temporally resolved laser/optical diagnostics of combustion processes: From fundamentals to practical applications

Laser diagnostic techniques have for more than five decades been used for gaining a deepened understanding of various combustion processes. The main reason for this is the possibility of non-intrusive measurements of key combustion parameters, e.g. species concentrations, temperatures and velocities, with high spatial and temporal resolution. The present paper will describe some development of the techniques themselves, followed by applications of relevant diagnostic techniques for studies of combustion phenomena and then more applied activities often related to challenges in an industrial environment.The paper is not meant to be a complete review of the entire research field but rather a survey with a majority of the contributions from the author's laboratory. After a short introduction and background (including some historical remarks), some common laser diagnostic techniques will be briefly described. Then some emerging techniques will be described. The first such area to be covered will highlight the use and application of structured illumination through Frequency Recognition Algorithm for Multiple Exposures, FRAME, enabling high speed visualization, 3D imaging and multiple species detection using one standard laser/detector. Furthermore, single ended diagnostics using Scheimpflug LIDAR and backward lasing using short pulse Stimulated Emission will be described and exemplified.In the category of studies of combustion phenomena, the paper will focus on diagnostic challenges and applications when studying combustion of some renewable fuels; solid biomass, ammonia and metals. When studying these fuels, often species not so commonly encountered when using fossil fuels are of interest, e.g. alkali containing species, e.g. KOH, KCl as well as nitrogen bound species, e.g. NH, NH2.In the field of applied diagnostics, preferably in an industrial environment, examples will be given from IC engines, gas turbines as well as full-scale industrial furnaces. In these phenomenological and industrial applications laser-induced fluorescence, Raman scattering and thermographic phosphorescence were mainly utilized, with some examples of photo-fragmentation LIF as well as non-liner techniques, IR-DFWM and CARS.The paper is concluded with a summary and some thoughts about the future.

Effect of Y3+ on the structural and photoluminescence properties of yttrium-doped sodium borate glass.

Glass of the composition 70%B2 O3 -(30-x)%Na2 O-x%Y2 O3 with x = 0, 0.5, 1, 1.5, 2, and 2.5 mol% was manufactured using the melt quenching method. X-ray diffraction tests indicated the amorphous structure of the glass, with the presence of some YBO3 clusters in the high yttrium content samples. Fourier transform infrared spectra analysis proved the presence of different borate groups and linkages, in addition to nonsystematic changes in the ratio BO3 /BO4 in the glass. The forming ability of the glass was found to be approximately stable for the low Y3+ content samples and increased for the heavily doped samples. The density of the samples was found to increase as the Y3+ concentration was increased, whereas the molar volume decreased. The bond strength of the examined glass suggested that a covalent nature was dominant between bonds. All the Y3+ -doped glass was found to emit greenish-cyan light when excited at . Photoluminescence intensity was shown to be enhanced by the generated YBO3 groups. The obtained correlated colour temperature values with 82.5% purity recommend the suitability of the glass for applications in outdoor illumination.

Load-Independent Hybrid Resonant Converter for Automotive LED Driver Applications

In this article, a hybrid resonant LED driver for automotive illumination applications is proposed. The employed <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> resonant network provides load-independent output current characteristic and accomplishes full soft-switching operation of the semiconductor devices within the desired input voltage range. To provide constant frequency operation and nonpulsating input current, a continuous conduction mode boost structure is merged into the resonant network. Also, the analog dimming capability range of 50%–100% is attained for the LED string by adjusting the main switches operating duty cycle. Detailed theoretical analysis of the proposed LED driver is presented. To verify the analysis and effectiveness of the proposed topology, a 40-W laboratory prototype is designed and implemented for the input voltage range between 8–18 V.

Study of low-temperature interconnection techniques for instant assembly of electronics on stretchable e-textile ribbons

This article addresses the research and development of a reliable interconnection technique for mounting surface mounted device components onto newly developed conductive stretchable textile ribbons. The alternative nonconductive adhesive bonding in which electrical contact is realized only by mechanical pressure and fixed by an adhesive and the conventional soldering technique were selected for examination. Assessment of the performance of these techniques and their usability for interconnecting components on conductive textile ribbons was also our research goal. Reliability tests of the electrical and mechanical properties of realized interconnections (dry heat, damp heat, washing, electrical current load, jerk, and stretch tests) were realized. The results show that the nonconductive adhesive technique results in good mechanical properties and acceptable median electrical resistance of less than 2 Ω even after 90 washing cycles. It is also very gentle and fully compatible with textile production due to the maximal processing temperature lower than 70°C, without the risk of short circuit occurrence. This technique is suitable for sensors, illumination or data transfer applications. While soldering results in excellent median electrical resistance of less than 20 mΩ, it is more complex and costly. Moreover, there is a risk of short circuits as well as of textile damage by the high thermal load over 150°C. Soldering is more suitable for power supply applications or heating. The above-mentioned results were also confirmed in a decision analysis with pairwise comparisons, involving company representatives considering introducing the above-mentioned interconnection techniques into their production. The nonconductive adhesive technique was evaluated as 15% better in overall decision analysis than the low-temperature soldering.

Encapsulation of AIEgens within Metal–Organic Framework toward High‐Performance White Light‐Emitting Diodes

AbstractWhite light‐emitting diodes (WLEDs) have a wide range of applications in display and illumination, however, it is still challenging to achieve efficient solid‐state white light‐emitting (WLE) materials due to the conventional quenching effect. Herein, a strategy of encapsulating aggregation‐induced emission luminogens (AIEgens) into the pores of metal–organic framework (MOF) to achieve high‐performance WLED is proposed. Two cationic dyes, 2,3,4,5‐tetrakis(4‐methoxyphenyl)oxazol‐3‐ium (MOTPO) and 1‐methyl‐4‐(4‐(1,2,2‐triphenylvinyl)phenyl)pyridin‐1‐ium (TPEPy) with bright blue and yellowish green emissions, respectively, are synthesized and successfully incorporated into the pore of anionic MOF ZJU‐28. The synergy of AIE characteristics and confinement effect within hybrid material result in an enhanced emission signal in comparison to each of the individual components. The single‐phase WLE material with Commission International de L'Eclairage coordinates of (0.35, 0.34) and the quantum efficiency of 64.9% is realized by optimizing the ratio between the two guests, which is almost the best among the reported WLE MOF composites to date. The resulting WLED demonstrates the maximum external quantum efficiency of 12.67% accompanied by the excellent color‐rendering index and correlated color temperature of 86 and 4076 K, respectively. Moreover, the WLE flexible film is also achieved. This work will provide new insights and strategies for the design of efficient WLEDs in the future.

Cultivation of Arthrospira platensis in Brewery Wastewater

Cultivation of photosynthetic microorganisms in wastewater is a potential cost-effective method of treating wastewater and simultaneously providing the essential nutrients for high-value biomass production. This study investigates the cultivation of the cyanobacterium Arthrospira platensis in non-diluted and non-pretreated brewery wastewater under non-sterile and alkaline growth conditions. The system’s performance in terms of biomass productivity, pollutant consumption, pigment production and biomass composition was evaluated under different media formulations (i.e., addition of sodium chloride and/or bicarbonate) and different irradiation conditions (i.e., continuous illumination and 16:8 light:dark photoperiod). It was observed that the combination of sodium bicarbonate with sodium chloride resulted in maximum pigment production recorded at the end of the experiments, and the use of the photoperiod led to increased pollutant removal (up to 90% of initial concentrations) and biomass concentration (950 mg/L). The composition of the microbial communities established during the experiments was also determined. It was observed that heterotrophic bacteria dominated by the phyla of Pseudomonadota, Bacillota, and Bacteroidota prevailed, while the cyanobacteria population showcased a dynamic behavior throughout the experiments, as it increased towards the end of cultivation (relative abundance of 10% and 30% under continuous illumination and photoperiod application, respectively). Overall, Arthrospira platensis-based cultivation proved to be an effective method of brewery wastewater treatment, although the large numbers of heterotrophic bacteria limit the usage of the produced biomass to applications such as biofuel and biofertilizer production.

Homogeneous distribution of phosphor particles inside resin using a vertical vibration method for efficient laser-based white light illumination.

We report what we believe to be an innovative method for the homogeneous distribution of phosphor particles inside the optical resin-based layer using a vertical vibrational technique for efficient laser-based white light illumination. In this method, single-stage vibration energy was efficiently used against phosphor sedimentation with the help of a mechanical vibrator system. The vertical vibrational energy was transferred to negate the downward gravitational effect acting on each phosphor particle. Therefore, the phosphor particles inside the layer were stable and uniformly distributed from the initial to final drying stages, creating approximate refractive index homogeneity inside the medium. The sedimentation problem was resolved, and all the optical parameters to support this method were properly analyzed and found to be stable and suitable for laser-based illumination applications.

Mechanisms behind multicolor tunable Near-Infrared triple emission in graphene quantum dots and ratio fluorescent probe for water detection

Developing environmental-friendly and low-cost strategies of synthesizing red-emission graphene quantum dots (R-GQDs) is a considerable challenge. Herein, we present the green and facile preparation of R-GQDs by using o-phenylenediamine (o-PD) and catechol as precursors via oxidation/polymerization and Schiff base reaction at low temperature (80 °C) for 3 hrs. Results show that the prepared R-GQDs exhibit triple fluorescence emissions, which is enabled by the introduce of different nitrogen (pyrrolic N, pyridinic N, and amino N) species on the surface of R-GQDs. Moreover, the R-GQDs are implemented to detect the moisture in different organic solvent. A highly sensitive ratiometric sensing of water in organic solvents is achieved, and the relationship between the change of fluorescence signal caused by moisture and the corresponding internal emission site is also determined. In the end, the multicolor light emissions of R-GQDs are realized by simply adjusting the polarity of surrounding solvents. And based on the solvatochromism of R-GQDs, the multicolor solid fluorescent powder and ink are prepared for illumination application. All in all, the above research work presents a novel R-GQDs for wide application in detecting and illumination.

Activating Energy Transfer Tunnels by Tuning Local Electronegativity of Conjugated Polymeric Backbone for High‐Efficiency OLEDs with Low Efficiency Roll‐Off

AbstractThermally activated delayed fluorescence (TADF) conjugated polymers are attractive for display and illumination applications owing to their excellent device performance and convenient device fabrication. However, conjugated polymers frequently encounter insufficient energy transfer from hosts to TADF units, lowering device performance. Herein, a strategy for improving light‐emitting performances through adjusting the local electronegativity of the polymeric backbones by inserting electron‐withdrawing atoms and activating energy transmission channels is proposed. Meanwhile, strongly electronegative atoms also affect the charge‐transfer natures (CT) of TADF polymers and minimize the energy difference between the lowest singlet and triplet states, leading to a rapid reverse intersystem crossing process through the vibronic coupling between 1CT and 3CT with extremely close energy levels. The produced TADF polymer, pBP‐PXZ, can achieve an external quantum efficiency (EQE) of 23.11%, exhibiting no roll‐off when the luminance is less than 200 cd m−2 whereas only a 3% EQE decrease at 500 cd m−2. The EQE can even maintain above 19% under 1000 cd m−2, which is the highest efficiency among TADF polymer‐based organic light‐emitting diodes (OLEDs) under high luminance. The study provides a new perspective for designing high‐performance OLEDs materials.

White-Light GaN-μLEDs Employing Green/Red Perovskite Quantum Dots as Color Converters for Visible Light Communication

GaN-based μLEDs with superior properties have enabled outstanding achievements in emerging micro-display, high-quality illumination, and communication applications, especially white-light visible light communication (WL-VLC). WL-VLC systems can simultaneously provide white-light solid-state lighting (SSL) while realizing high-speed wireless optical communication. However, the bandwidth of conventional white-light LEDs is limited by the long-lifetime yellow yttrium aluminum garnet (YAG) phosphor, which restricts the available communication performance. In this paper, white-light GaN-μLEDs combining blue InGaN-μLEDs with green/red perovskite quantum dots (PQDs) are proposed and experimentally demonstrated. Green PQDs (G-PQDs) and red PQDs (R-PQDs) with narrow emission spectrum and short fluorescence lifetime as color converters instead of the conventional slow-response YAG phosphor are mixed with high-bandwidth blue InGaN-μLEDs to generate white light. The communication and illumination performances of the WL-VLC system based on the white-light GaN-based μLEDs are systematically investigated. The VLC properties of monochromatic light (green/red) from G-PQDs or R-PQDs are studied in order to optimize the performance of the white light. The modulation bandwidths of blue InGaN-μLEDs, G-PQDs, and R-PQDs are up to 162 MHz, 64 MHz, and 90 MHz respectively. Furthermore, the white-light bandwidth of 57.5 MHz and the Commission Internationale de L’Eclairage (CIE) of (0.3327, 0.3114) for the WL-VLC system are achieved successfully. These results demonstrate the great potential and the direction of the white-light GaN-μLEDs with PQDs as color converters to be applied for VLC and SSL simultaneously. Meanwhile, these results contribute to the implementation of full-color micro-displays based on μLEDs with high-quality PQDs as color-conversion materials.

Adaptive polymer fiber neural device for drug delivery and enlarged illumination angle for neuromodulation

Objective. Optical fiber devices constitute significant tools for the modulation and interrogation of neuronal circuitry in the mid and deep brain regions. The illuminated brain area during neuromodulation has a direct impact on the spatio-temporal properties of the brain activity and depends solely on the material and geometrical characteristics of the optical fibers. In the present work, we developed two different flexible polymer optical fibers (POFs) with integrated microfluidic channels (MFCs) and an ultra-high numerical aperture (UHNA) for enlarging the illumination angle to achieve efficient neuromodulation. Approach. Three distinct thermoplastic polymers: polysulfone, polycarbonate, and fluorinated ethylene propylene were used to fabricate two step-index UHNA POF neural devices using a scalable thermal drawing process. The POFs were characterized in terms of their illumination map as well as their fluid delivery capability in phantom and adult rat brain slices. Main results. A 100-fold reduced bending stiffness of the proposed fiber devices compared to their commercially available counterparts has been found. The integrated MFCs can controllably deliver dye (trypan blue) on-demand over a wide range of injection rates spanning from 10 nl min−1 to 1000 nl min−1. Compared with commercial silica fibers, the proposed UHNA POFs exhibited an increased illumination area by 17% and 21% under 470 and 650 nm wavelength, respectively. In addition, a fluorescent light recording experiment has been conducted to demonstrate the ability of our UHNA POFs to be used as optical waveguides in fiber photometry. Significance. Our results overcome the current technological limitations of fiber implants that have limited illumination area and we suggest that soft neural fiber devices can be developed using different custom designs for illumination, collection, and photometry applications. We anticipate our work to pave the way towards the development of next-generation functional optical fibers for neuroscience.

Photo-thermal process on BiFeO3 thin film

This study demonstrates that a photo-thermal process, namely a concurrently light illumination during annealing, is an effective method to develop a high-quality BiFeO3 (BFO) thin film. The wavelength-dependent light effect, which is determined by the photo absorption property of the sol-gel synthesized BFO solution, assisted in the decomposition of organic residues within the film during the thermal history. The photo absorption property of the BFO precursor varied with an exponential function of temperatures. By using a combination of an appropriate wavelength light illumination and a suitable temperature thermal annealing, the BFO film formed in a uniform dense microstructure with near-stoichiometric composition which was difficult to achieve with a traditional thermal process. We proposed the application of light illumination under thermal process would improve the reaction sequences of the constituent species as well as the crystallization mechanism of BFO, then providing the flexibility to control the film characteristics.

Eu2+-activated MgAl2Si4O6N4: a novel oxonitridoalumosilicate blue phosphor for white LEDs.

Recently, blue-emitting phosphors have attracted great interest due to their application in full-spectrum white light illumination. In this paper, a novel blue-emitting MgAl2Si4O6N4:Eu2+ phosphor was successfully synthesized through the solid-state reaction method in a reducing atmosphere. Under the excitation of near-ultraviolet (n-UV) light, the MgAl2Si4O6N4:0.02Eu2+ phosphor effectively emits a broad blue emission band centered at 456 nm with the FWHM as large as 81 nm. With the increasing Eu2+ concentration, the emission bands of MgAl2Si4O6N4:Eu2+ shift to a shorter wavelength and the FWHMs broaden gradually. Moreover, the MgAl2Si4O6N4:0.02Eu2+ phosphor exhibits a slight thermal quenching at a higher temperature. After fabricating the as-prepared MgAl2Si4O6N4:0.02Eu2+ phosphor into a white LED device, the intense neutral white light emission is obtained with excellent CRI (87.4) and CCT (5645 K). These results suggest that the blue MgAl2Si4O6N4:Eu2+ phosphor is a promising candidate in n-UV excited white LEDs.

Structural and photometric investigations of green emanating Er3+ activated SrGd2Al2O7 nanophosphors for solid state illumination applications

This study features structural and photometric aspects of a down-converted green emanating erbium (Er3+) activated nanophosphor synthesized via a versatile and environmentally benign urea aided solution combustion procedure. The powder X-ray diffraction pattern (PXRD) of optimal sample SrGd1.96Er0.04Al2O7 studied qualitatively by employing the Rietveld refinement practice, disclosed the tetragonal crystal phase with space group 14/mmm (139), consisting grains of size 50.03 nm. Surface morphology and grain size of nanopowders were well investigated by electron microscopy practices like scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). SEM micrograph gave clear insight that Er3+ doped nanophosphors possess slightly agglomerated particles with pores, voids and cracks due to high pressure breakout of gases while combustion synthesis. TEM and SEM images revealed the size of nanoparticles in the ambit of 40–60 nm which was in coherence with that obtained from the scherrer's equation, while the inter-fringes distance corresponding to diffraction plane (116) was calculated to be 0.27 nm from the HRTEM image. The desired nanophosphor showed brilliant green emission with an intense peak at 551 nm attributed to 4S3/2 → 4I15/2 transition of Er3+ ions, as analyzed through photoluminescent (PL) emission spectra monitored via near ultraviolet excitation wavelength (381 nm) with an optimal doping concentration of 2.0 mol%. Advanced photometric features like CIE color coordinates (0.3017, 0.6043), CCT (6032K), and color purity (76.52%) confirmed their green glow and are found to be in harmony with standard green emission. The study offers a luminous cool green emanating component for the fabrication of WLEDs and advanced optoelectronic appliances.

Enhanced Stability and Luminous Performance for Structured Mn‐Doped CsPbCl3 Quantum Dots

AbstractTo improve the photoluminescence quantum yield (PL QY) and the environmental stability of the CsPbCl3 quantum dots (QDs), the Mn doping strategy has been applied first. The substitute of Mn2+ can reduce the toxicity of the lead element firstly, and then slightly enhance the stability of QDs. Increasing the nominal content of Mn, the longtime duration of the intrinsic excitation peak is significantly improved; and at a higher nominal content, a wide red emission by the d‐d transition of Mn2+ is introduced, the overall PL QY of CsPbCl3 QDs increases to 54.32 %. Secondly, to further prevent the penetration of oxygen and water, the Mn‐doped CsPbCl3@SiO2 nano‐composite with a physical coating shell was synthesized by the hydrolysis of aminopropyltriethoxysilane. The investigation on the PL spectrum within hours shows that the relative peak intensity maintains 74 % of the initial intensity and the shift of peak position is also inhibited. Finally, the nano‐composite materials were fabricated into white light‐emitting devices (WLED), under the illumination of a commercial GaN chip, the device shows a good Commission Internationale de lEclairage (CIE) color coordination of (0.31,0.35). As a result, the obtained Mn‐doped CsPbCl3@SiO2 QDs have excellent optical properties and good stability under aqueous and polar solvent environments. Therefore, this doping and coating method could pave the way for future applications in illumination and display fields.

Spatter reduction by multi-beam illumination in laser powder-bed fusion

Modulation of laser radiation is a promising approach to increase the process speed in laser powder-bed fusion. However, with an increased buildup rate, the preservation of product quality must be guaranteed. For this purpose, we investigated spatter generation with single-beam and multi-beam distributions for single tracks and printed objects. The investigation with a coaxial high-speed camera to capture thermal radiation of spatters and an off-axis high-speed camera for a qualitative observation of the melt pool led to a better understanding of spatter generation. The results showed dependency of power and scan velocity on the number of spatters. Furthermore, we showed that the application of multi-beams preserves the number of spatters per track at higher applied power. Due to the wide melt pools and fewer required hatches, the total number of spatters in a generated part was significantly reduced. In addition, by means of high-speed recordings, it was shown that melt pools with high volume have a higher stability against impurities of the powder bed and spatters. Finally, the application of multi-beam illumination led to a higher buildup rate with reduced spatter particles.

Crystal Defect Investigation in PVT-Grown ZnSe Under Different Seeding Conditions and Growth Configurations Using Synchrotron X-Ray Topography

Zinc Selenide (ZnSe) as a prominent II-VI semiconductor is notable for its excellent performance on high efficiency electronic and optoelectronic devices including blue light-emitting diodes, lasers, and blue/ultraviolet-light-sensitive photodetectors, which are of considerable interest for applications in optical storage, lighting and illumination, biomedical sensing, etc. The effective utilization of ZnSe is owing to its superior properties such as wide bandgap, low optical absorption in the visible and infrared spectral region, and intense edge luminescence in the short-wavelength spectral region. The preliminary requisite to satisfy all those essential properties is the crystalline quality. Therefore, the realization of high-performance devices requires high-quality ZnSe bulk crystals with minimized structural defects. In order to overcome limitations and continuously fulfill the requirement of modern device applications, obtaining a comprehensive understanding on ZnSe crystallographic structure and defect formation mechanism is crucial. In this study, characterization techniques including synchrotron white beam X-ray topography (SWBXT), optical microscopy and high-resolution triple X-ray diffraction (HRTXD) were conducted on seeded and self-seeded ZnSe crystals grown by physical vapor transport (PVT) method in horizontal and vertical growth configurations. The effect of seeding condition and gravity vector orientation with respect to growth geometry on crystalline quality and defect structures is investigated. The presence of grains and the occurrence of twinning is revealed and analyzed. This study provides a clear understanding of factors that causes ZnSe crystal quality variation during the growth process, which contributes to achieving the routine production of high-quality ZnSe crystal and modern device enhancement. Figure 1

Semi-continuous immobilized cultivation of Porphyridium cruentum for sulfated polysaccharides production

In this study, semi-continuous immobilized cultivation of Porphyridium cruentum through calcium alginate beads was performed for sulfated polysaccharides (SPs) production. The cell biomass and daily SPs productivity in the calcium alginate bead immobilized culture were increased by up to 79 ± 3.4% and 45.6 ± 3.2%, compared to those in the control, respectively. Furthermore, simultaneous application of immobilization and blue wavelength illumination further increased the phycobiliproteins content by 260 ± 9%, compared to those in the control. Similarly, nutrient deficiencies in combination with immobilization increased daily SPs productivity by about twice that of the control. The chemical composition and biological activity of the extracellular polymeric substances produced through immobilization were similar to those of the control. This study suggests the potential application of calcium alginate beads-based immobilization for continuous and high-efficiency SPs production using P. cruentum.

Design and fabrication of hybrid MLAs/gratings for the enhancement of light extraction efficiency and distribution uniformity of OLEDs.

Extracting light from organic light-emitting diodes (OLEDs) and improving the angular distribution are essential for their commercial applications in illumination and displays. In this work, hybrid microlens arrays (MLAs) and gratings with periods and depths in the scale of submicron have been designed and incorporated on the lighting surface of OLEDs for simultaneous enhancement of light outcoupling efficiency and angular distribution improvement. It is found that the augmentation of light extraction efficiency is mainly attributed to the MLAs, while the gratings can improve the viewing angle by increasing the angular distribution uniformity. A novel approach was proposed by combining photoresist thermal reflow, soft-lithography and plasma treatments on polydimethylsiloxane (PDMS) surfaces synergistically to realize gratings on the wavy surface of MLAs. It has been proved that with the hybrid MLAs/gratings, the external quantum efficiency (EQE) of the OLED can reach up to 22.8%, which increased by 24% compared to that of bare OLED. Moreover, the OLED with the hybrid MLAs/gratings showed an obvious lateral enhancement at wider viewing angle.

Ion-exchanged LTA zeolite derived nepheline phase NaAlSiO4:Eu2+ ceramic phosphor for laser illumination

A reliable yellow phosphor converter that can be efficiently excited by a 405 nm bluish violet laser is in high demand for laser illumination applications. A NaAlSiO4:Eu2+ phosphor with a quantum efficiency reaching 92% was obtained using LTA zeolite as the raw material. NaAlSiO4:Eu2+ ceramics with suitable porosities for laser illumination were prepared from the phosphor powders via spark plasma sintering. The ceramics lost only 2% of the quantum efficiency compared to the powders, maintained good thermal quenching properties (30% drop at 150 °C), and showed good thermal conductivity (2.02 W‧m−1‧K−1). The NaAlSiO4:Eu2+ ceramic with 405 nm bluish violet lasers, with the increase in laser power density to 9.15 W/mm2, exhibited an increasing luminous flux (23.83–70.26 lm) and maintained a stable luminous efficacy (47.7–46.8 lm/W), and the temperature distribution of the ceramic remained uniform and stable under long-time laser irradiation. This indicates that the nepheline-phase NaAlSiO4:Eu2+ ceramic is a promising material for laser illumination.