Luminous Mechanism Research Articles

Carrier Generation and Recombination in AC-QLEDs with a Synergistic Capacitance Effect of ZnO/PVDF Heterofunction Layers.

The alternating current-driven electroluminescence (AC-EL) of Cd-based quantum dots is garnering increasing attention due to advantages such as high efficiency and an extended operating lifetime. However, the generation and transport mechanisms of charge carriers within devices still need to be more understood. Here, we construct a simple device and investigate its luminance mechanisms within a single cycle using time-resolved spectroscopy. We tested the luminance-voltage and luminance-frequency characteristics of the device as the thickness of the insulating layer varied, finding that they both exhibited a trend of initially increasing and then decreasing as the voltage or frequency increased. We subsequently investigated the transient electroluminescent characteristics of the device, which featured a P(VDF-TrFE-CFE) layer as the insulator. This layer prevents carrier injection from the Al electrode, while the ZnO layer acts as a charge-generating layer to provide additional carriers. We observed that with an increase in AC voltage, the strongest luminance peak is advanced in the cycle compared to when lower voltages were applied. The position of the strongest luminance peak is delayed with an increasing AC frequency. The C-V characteristics demonstrated that the synergistic P(VDF-TrFE-CFE)/ZnO exhibited a displacement current transforming to a conduct current, which activates the forward operation of the QLED and enables it to emit light. The mechanism we present may serve as a benchmark for improving the luminance and longevity of such devices.

Color-tunable luminescence and energy transfer of Ba2YZrO6:R (R = Dy3+, Sm3+, Dy3+/Sm3+)

Abstract Rare earth ions (Dy3+ and Sm3+) doped luminescence materials have been attracted more interest owing to their excellent luminous properties. Here, Ba2YZrO6:R (R = Dy3+, Sm3+, Dy3+/Sm3+) are prepared in air by using high-temperature solid-state method. The crystal phase and purity are investigated by X-ray diffraction (XRD). The luminous properties are studied by using optical spectrometer. Green emission of Ba2YZrO6:Dy3+ with excitation at 260 nm is observed. Ba2YZrO6:Sm3+ with excitation 271 and 407 nm shows yellow and red-orange emission, respectively. Under excitation 271 nm, Ba2YZrO6:Dy3+, Sm3+ show emission from green to yellow with increasing Sm3+ concentration from 2 to 10 mol%. Ba2YZrO6:Dy3+, Sm3+ with excitation 407 nm glow yellow light. We investigate the concentration dependent spectra and confirm the optimal Dy3+ and Sm3+ concentrations. We estimate the concentration quenching mechanism in Ba2YZrO6:R (R = Dy3+, Sm3+) and Ba2YZrO6:Dy3+, Sm3+. The luminous mechanism and energy transfer process are analyzed by using the energy level transitions of Dy3+ and Sm3+ ions.

Triplet Energy Gap‐Regulated Room Temperature Phosphorescence in Host‐guest Doped Systems

The organic room temperature phosphorescence (RTP) materials via host‐guest doped method receive considerable attention in the fields of optoelectronics, bioimaging, and information encryption. Despite many host‐guest doped materials with excellent RTP properties have been developed, their luminous mechanism is still limited. Here, a series of host‐guest doped materials, using Benzophenone as the host and quinone compounds as the guests, were constructed to investigate the effect of the triplet energy gap (ΔET) between the host and guest on triplet states population. The guest’s triplet state is proposed to be a “triplet energy reservoir”, gathering the triplet excitons to emit RTP when ΔET is large and returning triplet excitons to the host when ΔET is small. By combining the results of steady‐state and delayed emission spectra, time‐resolved transient absorption, and theoretical calculations, A bidirectional energy transfer process is proved, which are triplet‐triplet energy transfer and reverse triplet‐triplet energy transfer processes. The thermal equilibrium of these two energy transfer processes can be regulated by the ΔET and temperature. The potential applications of these RTP properties are also realized in data encryption and anti‐counterfeiting. This work provides valuable insight into the design of host‐guest doped materials based on energy transfer mechanisms.

Triplet Energy Gap-Regulated Room Temperature Phosphorescence in Host-guest Doped Systems.

The organic room temperature phosphorescence (RTP) materials via host-guest doped method receive considerable attention in the fields of optoelectronics, bioimaging, and information encryption. Despite many host-guest doped materials with excellent RTP properties have been developed, their luminous mechanism is still limited. Here, a series of host-guest doped materials, using Benzophenone as the host and quinone compounds as the guests, were constructed to investigate the effect of the triplet energy gap (ΔET) between the host and guest on triplet states population. The guest's triplet state is proposed to be a "triplet energy reservoir", gathering the triplet excitons to emit RTP when ΔETis large and returning triplet excitons to the host when ΔETis small. By combining the results of steady-state and delayed emission spectra, time-resolved transient absorption, and theoretical calculations, A bidirectional energy transfer process is proved, which are triplet-triplet energy transfer and reverse triplet-triplet energy transfer processes. The thermal equilibrium of these two energy transfer processes can be regulated by the ΔETand temperature. The potential applications of these RTP properties are also realized in data encryption and anti-counterfeiting. This work provides valuable insight into the design of host-guest doped materials based on energy transfer mechanisms.

Versatile Molecular Structure Strategy Toward Highly Efficient Single‐Component White Organic Light–Emitting Diodes

AbstractLuminophores' dual emission (DE) properties hold great potential for realizing single‐component white organic light–emitting diodes (WOLEDs). This study illustrates that the unique and vibrant DE phenomena with different luminous mechanisms can be formed through simple modulation of molecular structures. Four target luminophores, namely 2‐TPE‐PPI, 2‐TPE‐PI, 2‐TPE‐An‐PPI, and 2‐TPE‐An‐PI, capable of DE under different conditions, are intentionally designed and successfully synthesized. Owing to the inherent flexibility of the minor molecular backbone and minor steric hindrance, 2‐TPE‐PPI and 2‐TPE‐PI exhibit DE spectra in dilute solutions with different solvent polarities. The intrinsic cause of the DE phenomenon in 2‐TPE‐An‐PPI and 2‐TPE‐An‐PI arises from the localized distribution of frontier molecular orbits resulting from the presence of an anthracene unit and the formation of an exciter group through intermolecular interactions involving anthracene. Remarkably, single‐emissive‐layer WOLEDs based on 2‐TPE‐An‐PPI and 2‐TPE‐An‐PI demonstrate stable white emission with CIE coordinates at (0.33, 0.39) and (0.30, 0.39), respectively, closely approaching the CIE coordinates of standard white light. Moreover, they maintain stable EL spectra from 4 to 10 V, an exceptional attribute rarely observed in many white light devices.

Study on the properties of Sm3+-Doped CaTbAl3O7 phosphors

New single phase and adjustable emission phosphors have attracted a lot of attention because of the good luminous properties. In this work, Sm3+ doped CaTbAl3O7 phosphors are prepared in air by solid-state method. The crystal structure, concentration dependent spectra, lifetimes, and luminescence properties are investigated. Because of the 4f8 → 4f75d1 and 4f → 4f transitions of Tb3+ ion, host (CaTbAl3O7) shows an excitation spectrum in the range of 220–520 nm under monitored at 544 nm and emits yellow-green light under excitation 248, 284, and 368 nm due to the 5D4 → 7FJ (J = 0, 1, 2, 3, 4, 5, and 6) transitions of Tb3+ ion. CaTbAl3O7:Sm3+ under monitored 598 nm contains the excitation spectral peaks of both CaTbAl3O7 and Sm3+ ion. With excitation at 368 nm, CaTbAl3O7:Sm3+ glows orange-red light, its PL spectrum has both host (CaTbAl3O7) and Sm3+ ion contributing, and the chromaticity coordinates are about (0.5499, 0.4351). Under excitation 402 nm, the red-orange emission of CaTbAl3O7:Sm3+ is only the contribution of Sm3+ ion and the chromaticity coordinates are about (0.5823, 0.4168). The energy transfer process from Tb3+ in host (CaTbAl3O7) to Sm3+ ions can be confirmed via the spectral properties. We explain the luminous mechanism of CaTbAl3O7:Sm3+ by the energy level diagrams of Tb3+ and Sm3+.

Diametral influence of deoxynivalenol (DON) and deepoxy-deoxynivalenol (DOM-1) on the growth of Campylobacter jejuni with consequences on the bacterial transcriptome

BackgroundDeoxynivalenol (DON) is a type B trichothecene mycotoxin that is commonly found in cereals and grains worldwide. The presence of this fungal secondary-metabolite raises public-health concerns at both the agriculture and food industry level. Recently, we have shown that DON has a negative impact on gut integrity, a feature also noticed for Campylobacter (C.) jejuni. We further demonstrated that DON increased the load of C. jejuni in the gut and inner organs. In contrast, feeding the less toxic DON metabolite deepoxy-deoxynivalenol (DOM-1) to broilers reduced the Campylobacter load in vivo. Consequently, it can be hypothesized that DON and DOM-1 have a direct effect on the growth profile of C. jejuni. The aim of the present study was to further resolve the nature of this interaction in vitro by co-incubation and RNA-sequencing.ResultsThe co-incubation of C. jejuni with DON resulted in significantly higher bacterial growth rates from 30 h of incubation onwards. On the contrary, the co-incubation of C. jejuni with DOM-1 reduced the CFU counts, indicating that this DON metabolite might contribute to reduce the burden of C. jejuni in birds, altogether confirming in vivo data. Furthermore, the transcriptomic profile of C. jejuni following incubation with either DON or DOM-1 differed. Co-incubation of C. jejuni with DON significantly increased the expression of multiple genes which are critical for Campylobacter growth, particularly members of the Flagella gene family, frr (ribosome-recycling factor), PBP2 futA-like (Fe3+ periplasmic binding family) and PotA (ATP-binding subunit). Flagella are responsible for motility, biofilm formation and host colonization, which may explain the high Campylobacter load in the gut of DON-fed broiler chickens. On the contrary, DOM-1 downregulated the Flagella gene family and upregulated ribosomal proteins.ConclusionThe results highlight the adaptive mechanisms involved in the transcriptional response of C. jejuni to DON and its metabolite DOM-1, based on the following effects: (a) ribosomal proteins; (b) flagellar proteins; (c) engagement of different metabolic pathways. The results provide insight into the response of an important intestinal microbial pathogen against DON and lead to a better understanding of the luminal or environmental acclimation mechanisms in chickens.

LaBaMg(Ti0.5W0.5)O6:Mn4+ for plant growth lighting: Luminescence properties and synthesis

With the need of food safety and high yield, new luminescent materials with promoting plant photosynthesis have attracted more and more attention. In this research, we synthesize the far-red-emitting LaBaMg(Ti0.5W0.5)O6:Mn4+ phosphor in air. We investigate the crystal structure and phase, particle morphology and size, and the luminescence properties. The samples show a broad excitation spectrum under monitored 704 nm due to the Mn4+ - O2− charge transfer (CT) and the transitions 4A2g → 4T1g, 2T2g, and 4T2g of Mn4+ in the range of 300 – 600 nm. The far-red emission of sample is observed with the emission spectrum (650 – 790 nm) is attributed to the Eg → 4A2g transitions. The chromaticity coordinates are (0.7329, 0.2671). The crystal field strength (Dq), the Racah parameters (B and C), and Dq/B values are ∼ 1972 cm−1, 596 cm−1, 3219 cm−1, and 3.31, respectively. 0.2 mol% is the optimal Mn4+ concentration. Emission spectra under excitation wavelength from 320 nm to 560 nm and time-resolved emission spectra confirm the only luminous center (Mn4+) in LaBaMg(Ti0.5W0.5)O6:Mn4+. Lifetime reduces with added Mn4+ concentration. The temperature-dependence emission spectra confirm that sample has a good thermo-stability. The thermal quenching phenomenon and luminous mechanism are analyzed. The luminescence properties of sample infer its application prospect in plant growth light-emitting diode (LED).

Recent Progress in Nonconventional Luminescent Macromolecules and their Applications.

Traditional π-conjugated luminescent macromolecules typically suffer from aggregation-caused quenching (ACQ) and high cytotoxicity, and they require complex synthetic processes. In contrast, nonconventional luminescent macromolecules (NCLMs) with nonconjugated structures possess excellent biocompatibility, ease of preparation, unique luminescence behavior, and emerging applications in optoelectronics, biology, and medicine. NCLMs are currently believed to produce inherent luminescence due to through-space conjugation of overlapping electron orbitals in solid/aggregate states. However, as experimental facts continue to exceed expectations or even overturn some previous assumptions, there is still controversy about the detailed luminous mechanism of NCLMs, and extensive studies are needed to further explore the mechanism. This Perspective highlights recent progress in NCLMs and classifies and summarizes these advances from the viewpoint of molecular design, mechanism exploration, applications, and challenges and prospects. The aim is to provide guidance and inspiration for the huge fundamental and practical potential of NCLMs.

Efficient broadband NIR emission of Yb3+-activated double-perovskite tungstate Ba0.5MgLaWO6☆

Broad-band near-infrared (NIR) phosphors have garnered increasing attention due to the versatile applications in spectroscopy technology fields, but the choice of efficient NIR phosphors remains a challenge. Here, Yb3+-activated cubic double-perovskite tungstate Ba0.5MgLaWO6 was synthesized using a solid-state reaction method. A broadband NIR emission (800–1150 nm) is observed from the 2F5/2→2F7/2 transition of Yb3+ activators in Ba0.5MgLaWO6 under the excitation by UV and near-UV light. Photoluminescence (PL) spectra, decay and emission lifetimes, concentration-dependent intensities, and low temperature luminescence of Yb3+-activated Ba0.5MgLaWO6 were investigated to study the energy transfer (ET) from isolated WO6 polyhedra to Yb3+ activators. The main luminous mechanism involves cooperative energy transfer (CET), wherein, one high-energy excitation photon absorbed by host WO6 group converts to two NIR photons emitted by Yb3+. The partial substitution of Mo6+ for W6+ in Ba0.5MgLaWO6 further leads to a significant increase of the intensity and lifetime of the NIR luminescence. This work provides a feasible strategy for developing a new Yb3+-doped perovskite tungstate, which demonstrates efficient wavelength down-conversion from UV and near-UV to NIR. This material could find versatile applications as an effective NIR luminescent candidate.

Recent Advances in Optical Properties and Light‐Emitting Diode Applications for 2D Tin Halide Perovskites

AbstractLead halide perovskites are widely used and intensively studied in optoelectronic devices due to their superior properties. However, the toxicity of Pb hinders the industrialization of perovskite optoelectronic devices. Sn has a similar electronic structure to Pb, thus has been widely studied as an alternative to Pb‐based perovskite optoelectronics in recent years. In this review, the research progress in luminescent properties and synthesis methods of 2D tin halide perovskites are summarized. It is also highlight a unique dual emission phenomenon in 2D tin halide perovskites and summarize several types of possible luminous mechanisms. At last, the recent development of 2D tin halide perovskites based light‐emitting diodes are also overviewed, and the challenges of oxidative inhibition and efficiency improvement in 2D tin halide perovskites are discussed. This review is expected to provide a comprehensive perspective on luminescent properties and light‐emitting diode applications of 2D tin halide perovskites.

Capturing Doublet Intermediate Emitters by Chemically Crosslinking Confinement towards Spatiotemporal Encryption

AbstractPhotoluminescence is one of the most meticulous ways to manipulate light energy. Typical photoluminescent emitters are mostly stable substances with a pure photophysical process of spontaneous photon‐emission from their excited states. Intermediate emitters are elusive attributing to their synchronous energy transfer process including photophysical and incomplete photochemical pathways. An intermediate emitter containing radicals is more difficult to be observed due to its inherent chemical reactivity. Here, these challenges are overcome by spontaneously formed space limitations in polymer crosslinking networks meanwhile chemically active intermediates are captured. These doublet intermediates exhibit unique long‐wavelength emissions under chemically crosslinking confinement conditions, and their luminous mechanism provides a novel perspective for designing intermediate emitters with liquid‐crystal character and photoresponsive features towards spatiotemporal encryption, promising for the detection of photochemical reactions and the development of fascinating luminescent systems.

Capturing Doublet Intermediate Emitters by Chemically Crosslinking Confinement towards Spatiotemporal Encryption.

Photoluminescence is one of the most meticulous ways to manipulate light energy. Typical photoluminescent emitters are mostly stable substances with a pure photophysical process of spontaneous photon-emission from their excited states. Intermediate emitters are elusive attributing to their synchronous energy transfer process including photophysical and incomplete photochemical pathways. An intermediate emitter containing radicals is more difficult to be observed due to its inherent chemical reactivity. Here, these challenges are overcome by spontaneously formed space limitations in polymer crosslinking networks meanwhile chemically active intermediates are captured. These doublet intermediates exhibit unique long-wavelength emissions under chemically crosslinking confinement conditions, and their luminous mechanism provides a novel perspective for designing intermediate emitters with liquid-crystal character and photoresponsive features towards spatiotemporal encryption, promising for the detection of photochemical reactions and the development of fascinating luminescent systems.

Excitation Wavelength‐Dependent Fluorescence of a Lanthanide Organic Metal Halide Cluster for Anti‐Counterfeiting Applications

AbstractThe achievement of significant photoluminescence (PL) in lanthanide ions (Ln3+) has primarily relied on host sensitization, where energy is transferred from the excited host material to the Ln3+ ions. However, this luminous mechanism involves only one optical antenna, namely the host material, which limits the accessibility of excitation wavelength‐dependent (Ex‐De) PL. Consequently, the wider application of Ln3+ ions in light‐emitting devices is hindered. In this study, we present an organic–inorganic compound, (DMA)4LnCl7 (DMA+=[CH3NH2CH3]+, Ln3+=Ce3+, Tb3+), which serves as an independent host lattice material for efficient Ex‐De emission by doping it with trivalent antimony (Sb3+). The pristine (DMA)4LnCl7 compounds exhibit high luminescence, maintaining the characteristic sharp emission bands of Ln3+ and demonstrating a high PL quantum yield of 90–100 %. Upon Sb3+ doping, the compound exhibits noticeable Ex‐De emission with switchable colors. Through a detailed spectral study, we observe that the prominent energy transfer process observed in traditional host‐sensitized systems is absent in these materials. Instead, they exhibit two independent emission centers from Ln3+ and Sb3+, each displaying distinct features in luminous color and radiative lifetime. These findings open up new possibilities for designing Ex‐De emitters based on Ln3+ ions.

Oxidation-induced and dimer-structured clusteroluminescence for simple emissive amine molecules: Mechanism of non-traditional intrinsic luminescence

Non-traditional intrinsic luminescence (NTIL) substances have received a lot of attention because of their unique fluorescence properties in recent years. However, the NTIL molecules actually do not contain any aromatic or extended π-systems, therefore the relationships between luminous structure and emissive mechanism are still extremely debatable. In view of the above problems, this paper used small molecular amines (mainly triethylamine, TEA), a basic representative of nitrogen-containing NTIL molecules, as a template to study the structure and mechanism of NTILs. By circular treatment of reflux/distillation, careful analysis of the structural characterization coupled with theoretical calculations, we demonstrated that the optical properties of TEA were strongly related to oxygen molecules. Particularly, our data indicated that oxygen molecules induced a weak hydrogen bond between TEA molecules to form a dimer structure, meanwhile, the robust TEA-dimer and oxygen molecules were through n-π electron delocalization space conjugated to form an N⋯O clusteroluminogens. This physical bonding and spatial conjugate fluorophore structure not only well explains: why such nitrogen-containing NTIL substances lack normal organic conjugate structures and exhibit abnormally bright fluorescence in the visible spectrum when exposed to oxygen molecules (a traditional organic fluorescent material quencher), but also has important implications for further elucidating some tissue biofluorescence from oxidative folding of proteins.

Color tunable upconversion luminescence of Er3+ -Yb3+ codoped KY3F10 prepared by a hydrothermal treatment

The KY3F10: Er3+, Yb3+ upconversion (UC) phosphor was prepared using a hydrothermal technique. The study investigated the impact of sample structure, morphology, Er3+ doping concentration, and annealing time on the UC emission properties. The results revealed that the synthesized samples had cubic KYb3F10 structures, with a block size of approximately 200–500 nm for the 12-hour annealed sample, which reduced to a grain size of 50–100 nm for the 5-hour annealed sample. Intense UC light emission was observed in the sample at 1.0%Er3+, and 10%Yb3+ doping concentration for an annealing time of 12 h. Their respective peak emissions were measured at 551 and 665 nm, with green light visible to naked eye. The color purity of the green light was estimated to be 96.7%, while the decay time for the green emission light was 557.6 ms and 716.2 ms for red emission light. When the annealing time of the 1.0% Er3+, 10% Yb3+ doping sample was shortened to 5 h, the light color changed to bluish-white. The correspounding peak emissions were measured at 479 nm, 547 nm and 654 nm. These findings suggest that the annealing time has a substantial impact on both the sample size and UC luminescence. The study also discusses the UC luminous mechanism in detail.

Energy transfer and tunable-color luminescence properties of a single-phase CaSrNb2O7:Sm3+, Bi3+

New tunable-color luminescent materials are getting a lot of attention. Double-doped activated ions are an important research method. Here, CaSrNb2O7:R3+ (R3+ = Sm3+, Bi3+, and Sm3+/Bi3+) are synthesized by solid state method in the air. Phase purity and successful synthesis of samples are confirmed by X-ray diffractometer (XRD) patterns and energy disperse spectroscopy (EDS) diagram. The luminescence properties of samples are studied. CaSrNb2O7:Sm3+ has an excitation spectrum due to the O2- - Sm3+ charge transfer band (CTB) and the 6H5/2 → 4H9/2, 4D3/2, 4D1/2, 4F7/2, and 4I11/2 transitions of Sm3+ ion. The red-orange emission of CaSrNb2O7:Sm3+ is observed because of the 4G5/2 → 6H5/2, 6H7/2, 6H9/2, and 6H11/2 transitions of Sm3+ ion. PLE spectrum of CaSrNb2O7:Bi3+ comes from the metal-to-metal charge- transfer (MMCT) Bi3+ - Nb5+ and the 1S0 → 1P1 and 3P1 transitions of Bi3+ ion. CaSrNb2O7:Bi3+ shows blue emission due to the 3P1 → 1S0 transition of Bi3+ ion. The excitation spectrum of CaSrNb2O7:Sm3+, Bi3+ contains that of CaSrNb2O7:Bi3+ and CaSrNb2O7:Sm3+. CaSrNb2O7:Sm3+, Bi3+ with excitation at 314, 363, and 406 nm glows orange and red-orange, and red emission, respectively. We observe the energy transfer from Bi3+ to Sm3+ ions and the effect of Bi3+ on luminescence properties of Sm3+ ion by their spectra. The optimal Sm3+ and Bi3+ concentrations are confirmed by the concentration dependent spectra. The energy level diagrams of Sm3+ and Bi3+ are used to analyze the luminous mechanism. The results are conducive to the development of new Sm3+ and Bi3+ co-doped luminescent materials.

Abnormal Bi3+ activated NIR phosphor toward multifunctional LED applications

Herein, the strategy of replacing Ge4+ with smaller Si4+ was adopted to realize the site-selective occupation of Bi3+ activator in the small ring and obtain a near-infrared light-emitting in Zn2(Ge,Si)O4. The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift (εc) and crystal field splitting (εcfs). This work not only provides new insights for the development of Bi3+-activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi3+.

Tuning the luminescence properties of MgO by doping Mn cation

MgO: xMn2+ (0.001 ≤ x ≤ 0.01) phosphors are prepared by solid-state reaction method and their structural and optical properties were investigated. The prepared samples are characterized through XRD, SEM, XPS, UV–Visible spectroscopy and photoluminescence (PL). Red emission band of MgO: xMn 2+ phosphor is observed in the range of 550–700 nm. The optimal Mn2+ ion concentration in MgO: xMn2+ phosphor is ∼ 5 mol%. The luminous mechanism of Mn2+ ion in MgO: xMn2+ phosphor is explained by 4T 1 (G) → 6 A 1(S) transition of the Mn2+ ion and defects of MgO.

Synthesis, spectral characteristics and energy transfer of SrLa2Al2O7:Mn4+, Dy3+

Researchers usually co-dope other ions in Mn4+ doped phosphors to improve and regulate their luminescence properties for the improvement of their practicality. Here, we synthesize SrLa2Al2O7:R (RDy3+, Mn4+, and Dy3+/Mn4+) samples by solid-state method in air. The crystal structure and phase purity are confirmed by XRD patterns of samples. We investigate the morphology, luminescence properties, optimal doping concentration of Dy3+ and Mn4+ ions, lifetimes as well as the energy transfer from Dy3+ to Mn4+ ions. We observe yellow emission of SrLa2Al2O7:Dy3+ under excitation 355 nm in the region from 450 nm to 650 nm with chromaticity coordinates (0.4684, 0.5035) due to the 4F9/2 → 6H15/2 and 6H13/2 transitions of Dy3+ ion. SrLa2Al2O7:Mn4+ under excitation 355 nm emits far-red light in the region from 650 nm to 810 nm with chromaticity coordinates (0.7141, 0.2858) due to the transition 2Eg → 4A2g of Mn4+ ion. SrLa2Al2O7:4mol%Dy3+, 0.5mol%Mn4+ under excitation 355 nm contains the emission of both Dy3+ and Mn4+, and shows red emission with chromaticity coordinates (0.5899, 0.4055). The energy transfer process from Dy3+ to Mn4+ ions in SrLa2Al2O7:Dy3+, Mn4+ is verified by the spectral characteristics. The luminous mechanisms of samples are analyzed by energy level diagrams of Dy3+ and Mn4+ ions.