JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yonghai Gou,Jun Pang,Chaochao Dong,Zhenzhen Qiu,Huidong Mo,Jilin Wang,Rui Zhang
YAG:Ce-Al 2 O 3 composite ceramics were prepared by the Joule-heating sintering at 1850 °C within 3 min. • YAG:0.012Ce-8Al 2 O 3 ceramic shows relative density of 99.62% and transmittance of 42.3% at 600 nm. • YAG:0.012Ce-8Al 2 O 3 ceramic shows bright yellow-green emission with quantum efficiency of 80.12%. • The assembled white LED achieves a LE of 138.5 lm∙W ‐1 , and white LD delivers a LF of 392.3 lm. YAG:Ce-Al 2 O 3 composite ceramic phosphors are promising all-inorganic color converters for high-power white LEDs/LDs, but the conventional preparation requires prolonged high-temperature sintering. In this work, (100 − y )Y 3- x Al 5 O 12 : x Ce 3+ - y Al 2 O 3 (YAG: x Ce- y Al 2 O 3 , 0.002 ≤ x ≤ 0.024, 0 ≤ y ≤ 12 wt%) composite ceramic phosphors were prepared by graphite-assisted Joule-heating sintering. Dense ceramics were obtained at a nominal mold temperature of 1850 °C within 3 min. The effects of Ce 3+ concentration and Al 2 O 3 content on phase composition, microstructure, optical transmittance, luminescence behavior and thermal stability were investigated in detail. The optimized YAG:0.012Ce-8Al 2 O 3 ceramic exhibited a relative density of 99.62%, an in-line transmittance of 42.3% at 600 nm (0.5 mm thickness), an internal quantum efficiency of 80.12%, and a retained emission intensity of 84.26% at 150 °C. The introduction of Al 2 O 3 refined YAG:Ce grains and enhanced excitation-light scattering, thereby improving excitation-light absorption and emission output. The 0.4 mm-thick ceramic-based white LED device achieved a luminous efficacy of 138.5 lm∙W ‐1 , while the 1.2 mm-thick ceramic delivered a luminous flux of 392.3 lm under 450 nm laser excitation. These results indicate that the Joule-heating sintering provides a rapid-processing route for ceramic phosphors toward white LED/LD applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Fei Li,Yayuan Liu,Xuanhang Wang,Xin Qiao,Jing Wang,Bo Liu,Jiangyan Wang,Li Bo,Baohua Zhu,Zhongzhi Wang,Pengcheng Hao
Ce:YAG phosphor-in-glass (PiG) has been widely recognized as a high-performance light conversion material for high-power white light-emitting diodes (LEDs). The compositional design of the glass matrix plays a critical role in determining the optical, physical, and chemical properties of the resulting PiG. In this study, a novel glass matrix based on the NaF-Na 2 O-K 2 O-MgO-CaO-Al 2 O 3 -SiO 2 system was proposed, which was integrated with Ce:YAG phosphor to fabricate Ce:YAG-PiG via a low-temperature sintering process at 640 ℃. X-ray diffraction (XRD) and photoluminescence (PL) analyses confirmed that the Ce:YAG crystalline phase retained excellent crystallinity within the glass matrix. The synthesized Ce:YAG-PiG achieved a maximum internal quantum efficiency (IQE) of 84.62%, which is close to that of the pristine phosphor (90.38%). Microstructural analysis revealed a distinct interface between the phosphor and the glass matrix, with no signs of erosion. Additionally, its porous structure facilitates heat dissipation and light scattering. Ce:YAG-PiG exhibited remarkable thermal stability, retaining 91.4% of its initial luminescence intensity at 175 ℃, which significantly outperformed the pristine Ce:YAG phosphor that retained only 84.3% of its initial intensity under the same conditions. Notably, Ce:YAG-PiG showed a weakened thermal quenching effect with increasing temperature, thus exhibiting a significantly lower luminescence intensity decay compared to pure Ce:YAG powder. In the final optical performance evaluation, Ce:YAG-PiG samples with a phosphor loading of 50 wt% and a thickness of 0.5 mm achieved a high luminous efficacy of 165.6 lm/W at an operating current of 350 mA, with a correlated color temperature (CCT) of 4728 K, which is close to that of standard cool white light. These experimental results demonstrate that Ce:YAG-PiG maintains stable luminescent performance under high-power operating conditions, laying a solid foundation for the practical application and development of high-power white LEDs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yiwei Wang,Yue Li,Yongbo Ma,Yachong Liu,Haolin Lu,Huanxin Yang,Wenda Sun,Xiangxiang Chen,Wei Xiong,Libing Zhang,Xiyan Li
Lead-free halide perovskites are highly appealing for optoelectronic applications due to their non-toxic nature and exceptional optical properties. In this study, we report the co-doping of Sb 3+ and Sm 3+ in the rare-earth-based double perovskite Cs 2 NaGdCl 6 . The incorporation of Sb 3+ ions effectively tunes the electronic structure, achieving a photoluminescence quantum yield (PLQY) of up to 87.9 %. The Sb 3+ /Sm 3+ -co-doped Cs 2 NaGdCl 6 exhibits excitation wavelength-dependent emission characteristics, transitioning from blue emission under 260 nm excitation to white emission under 365 nm excitation. Furthermore, the Sb 3+ /Sm 3+ -co-doped Cs 2 NaGdCl 6 material demonstrates advanced multifunctional applications in light-emitting diode (LED) lighting and fluorescence anti-counterfeiting technologies. These findings hold significant implications for the utilization of rare-earth-based double perovskites in optoelectronic devices.
研究领域:
材料科学
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光学
·
电子工程
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Advanced Optical Materials
·
2022
·Vol. 10
·期 6
·2102373
·
IF 10.05
Zhiyu Yang,Gaochao Liu,Yifei Zhao,Yayun Zhou,Jianwei Qiao,Maxim S. Molokeev,Hendrik C. Swart,Zhiguo Xia
The discovery of Eu 2+ -doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu 3+ to Eu 2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO 4 :Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH 4 ) 2 SO 4 -assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu 2+ prefers to occupy the Sr 2+ sites in the SrLaScO 4 enabling red emission, and a competitive site occupation of Eu 3+ in La 3+ can be restrained, and the reduction mechanism of Eu 3+ to Eu 2+ originating from the (NH 4 ) 2 SO 4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO 4 :Eu and yellow-emitting Y 3 (Al,Ga) 5 O 12 :Ce 3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu 2+ -doped red phosphor for WLED applications.
研究领域:
材料科学
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光学工程
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Bufan Yu,Xingxing Duan,Zhaohui Xing,Jiacheng Liu,Yutong Pan,Lei Wang,Jiangshan Chen,Dongge Ma
Quasi-2D perovskites are emerging as promising materials for light-emitting applications due to their pronounced quantum confinement effects. Blue perovskite light-emitting diodes (PeLEDs) remain fundamentally challenging yet critically demanded for display applications. Current strategies employing quasi-2D perovskites face inherent trade-offs: 1) increased spacer cation content enhances quantum confinement for blueshift but deteriorates charge transport through insulating organic layers; 2) multiphase quantum well formation broadens emission spectra (fwhm >25 nm), compromising color purity; 3) chloride incorporation for bandgap widening induces deep-level traps and accelerates halide segregation under operational voltage. Herein, we address these intertwined challenges through multifunctional additive engineering using phenylbiguanide (PBG). The conjugated molecular structure with dual −NH2/═NH groups enables 3-fold functionality: First, strong Pb–PBG coordination effectively passivates uncoordinated halide vacancies, suppressing nonradiative recombination and achieving a high photoluminescence quantum yield (PLQY) of 76.6%. Second, hydrogen-bonding networks between PBG and [PbX6]4– frameworks immobilize halide ions, inhibiting electric-field-driven Cl/Br phase segregation. Third, PBG modulates crystallization kinetics to produce a narrow quantum well distribution for narrow emission (fwhm = 21 nm) at 472 nm and efficient Förster resonance energy transfer. The synergistic effects yield pure-blue PeLEDs with an impressive EQE of 9.32% at 472 nm, with stable emission and a 10-fold enhancement of lifetime compared to the pristine device without PBG. This work offers a promising approach to the development of high-performance blue PeLEDs using quasi-2D perovskites.
研究领域:
材料科学
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光电子学
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半导体器件
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发光二极管
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钙钛矿材料
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jia-Lin Pan,Wan-Shan Shen,Hua-Hui Li,Lei Huang,Zong-Shuo Liu,Zhao-Kui Wang,Bao-Quan Sun,Ya-Kun Wang,Liang-Sheng Liao
Lanthanide-alloyed perovskite quantum dots (QDs, Yb 3+ : CsPb(Cl 1-x Br x ) 3 ) are promising in near-infrared light-emitting diodes (NIR-LEDs) for theoretically ≈200% photoluminance quantum yield because of quantum-cutting effect, where one high-energy photon is used as a source to generate two low-energy photons. However, the inferior stability of Yb 3+ : CsPb(Cl 1-x Br x ) 3 remains a big challenge. It is posited that vacancy-defect complexes during lanthanide ions alloying are the driving force behind the collapse of octahedral geometry. Here, a coordination agent compensation plus an in situ doping strategy is developed to address the incompatibility between high NIR emission and good stability. This is achieved by combining the sodium ion to fill the vacancy and a coordinating agent (pyridine-2-carboxylic acid) for passivation. This enabled the treated QD films to have a magnitude of order decreased deep trap density compared to the control. Besides, the treated composite exhibits a sixfold increase in NIR intensity and tenfold lower trap states. Using the optimized Yb 3 ⁺: CsPb(Cl 1-x Br x ) 3 , NIR-LEDs are fabricated and achieved an external quantum efficiency of 8.2%, one of the highest values among NIR LEDs with emission >950 nm. Furthermore, these LEDs exhibit a 30-fold increase in operational stability compared to the control.
研究领域:
材料科学
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光学
·
纳米技术
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yuxiang Xin,Jianru Wang,Xiaoli Gao,Yang Yang,Jianbing Zhang,Jiang Tang,Zhuolei Zhang
The development of ultrabroadband light sources spanning the visible (Vis) to near-infrared (NIR) range is of fundamental importance for cutting-edge applications in communication, metrology, and quantum technologies. Although phosphor-converted LEDs have extended emission, they still suffer from spectral gaps, inadequate color rendering, and constrained NIR output. Here, a promising approach is introduced by tailoring multi-exciton energy transfer pathways to realize ultrabroadband Vis-to-NIR emission in Sb 3 ⁺/Ln 3 ⁺ co-doped vacancy-ordered Cs₂HfCl₆ perovskite nanocrystals. By systematically optimizing Sb 3 ⁺ and Ln 3 ⁺ doping concentrations, excitation wavelengths, and lanthanide ion selection, the energy transfer pathways between singlet and triplet self-trapped exciton (STE) states and lanthanide energy levels are modulated. This design facilitates broad spectral tunability through energy distribution control among emission centers, improves radiative efficiency by reducing energy losses during transfer processes, and promotes stable performance by mitigating excessive energy accumulation. The resulting single-component LED based on Sb 3 ⁺/Pr 3 ⁺ co-doped NCs delivers broadband emission extending to ≈1200 nm, high spectral quality (CRI ∼ 98.1, R9 ∼ 98), strong visible/NIR PLQY (≈80%), and steady operation over 50 h. The findings provide insight into energy transfer engineering in low-dimensional perovskites and offer a viable route toward emerging ultrabroadband solid-state light sources.
研究领域:
材料科学
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光学工程
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光电子学
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PubMed
高影响因子
Laser & Photonics Reviews
·
2025
·
IF 10
Yang Tang,Qingyu Xie,Xuanming Zhang,Jiwei Ma,Hao Xie,Yongfeng Liu,Liang Zhao,Dongdong Yan,Xiaoyu Wang,Weixiang Ye
Cs 3 Cu 2 Cl 5 nanocrystals (NCs) have emerged as promising optoelectronic materials owing to their efficient self-trapped exciton (STE) emission. However, their limited environmental stability has significantly constrained their application in light-emitting diodes (LEDs). In this work, a facile ambient-air synthesis strategy is developed for Mg 2 ⁺-doped Cs 3 Cu 2 Cl 5 NCs that simultaneously addresses both stability and emission efficiency challenges. Remarkably, optimal Mg 2 ⁺ doping (20%) enhances the photoluminescence quantum yield (PLQY) from 28.69% to 59.3%. Comprehensive theoretical investigations through density of states (DOS) calculations and ab initio molecular dynamics (AIMD) simulations demonstrate that Mg 2 ⁺ doping induces bandgap narrowing for enhanced radiative recombination while reinforcing the crystal lattice stability. When integrated with a UV LED chip, the optimized NCs enable the fabrication of high-performance green LEDs exhibiting outstanding luminance (17 281 cd m − 2 ) and excellent color stability (CIE coordinates: 0.354, 0.518). This study provides not only a practical synthetic approach for stable copper halide NCs but also valuable insights for designing efficient STE emitters for optoelectronic applications.
研究领域:
材料科学
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光学工程
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理论计算
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2025
·
IF 3.5
Shao-rong Bie,Ding-shun She,Wen Yue
A series of Ca 10 (PO 4 ) 6 F 2 :Er 3+ phosphors doped with varying concentrations of Er 3+ concentrations (2–14 mol.%) have been synthesized via a hydrothermal method to investigate their optical spectroscopy and temperature-sensing properties. Rietveld refinements of the XRD data reveal that Er 3+ ions preferentially occupy Ca2 sites rather than Ca1 sites to reduce electrostatic repulsion between cations within the fluorapatite lattice. Morphological characterization using SEM, TEM, and EDS confirms that the synthesized phosphors exhibit a rod-like morphology with dimensions of approximately 2.5 μm in length and 1 μm in diameter, along with an excellent single-crystal structure and uniform elemental distribution. Under 378 nm excitation, the phosphors exhibit prominent green emission peaks corresponding to the 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions. The optimal dopant concentration is determined to be 10 mol.%, with a calculated critical distance of 9.98 Å, indicating that electric quadrupole–quadrupole interactions dominate the concentration quenching mechanism. The luminescence lifetime of the optimized phosphor has been measured as 0.604 ms. Additionally, the chromaticity coordinates (0.3127, 0.6723) and high color purity (98.06 %) highlight the potential applicability of this phosphor in white light-emitting diodes (LEDs) and other optoelectronic devices.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.9
Yingfang Li,Long Tian,Qingzhe Wu,Xiaohuan Long,Hai Wu,Chaoyong Deng,Weichao Huang
Mn 4+ -doped oxide phosphors with deep-red emission show significant application potential in plant-growth LEDs. In this study, double perovskite Ba 2- x Sr x GdSbO 6 : Mn 4+ deep-red phosphors were developed via a cation substitution strategy. The crystal structure, optical properties, and thermal stability of the phosphors were investigated in detail. The as-prepared phosphors showed an intense deep-red emission band around 625–750 nm. Cationic substitution with Sr 2+ significantly improved the luminescence performance of the Ba 2 GdSbO 6 : Mn 4+ phosphors, and the optimized sample BaSrGdSbO 6 : Mn 4+ was obtained, achieving a nearly 12-fold enhancement in emission intensity. Furthermore, the electroluminescence (EL) spectrum of the prototype LED device fabricated based on the BaSrGdSbO 6 : Mn 4+ phosphor is matched well with the absorption band of plant pigments. These findings demonstrate that the BaSrGdSbO 6 : Mn 4+ phosphors have potential applications in plant-growth LEDs, and also provide some guiding inspirations in the exploration of novel Mn 4+ -doped double perovskite phosphors.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6163-6172
·
IF 3.288
Dayu Huang,Peipei Dang,Xiao Xiao,Biao Bai,Hongzhou Lian,Qingguang Zeng,Jun Lin
It is necessary to develop novel high-efficiency red or far-red-emitting LEDs in order to facilitate the phosphor-converted light-emitting diodes (pc-LEDs) for plant growth. This work reports a series of novel far-red emitting (Ba,Sr)LaZnTaO6:xMn4+ phosphors with double perovskite structure synthesized by the traditional high-temperature solid-state reaction (SSR). The crystal structure and morphology of (Ba,Sr)LaZnTaO6 were investigated by high-resolution TEM, SEM, and XRD Rietveld refinement. The photoluminescence properties were systematically explored and analyzed by diffuse reflectance (DR) spectra, photoluminescence emission (PL) and excitation (PLE) spectra, decay curves, and temperature-dependent spectra. Mn4+ ions occupy Ta5+ sites located at the [TaO6] octahedral emitting red light with the peak at 698 nm in BaLaZnTaO6:Mn4+ and 695 nm in SrLaZnTaO6:Mn4+ under n-UV and blue light excitation. The critical quenching concentration of Mn4+ was determined to be 0.008. The concentration quenching mechanism could be a dipole–dipole interaction between the Mn4+ ions. In addition, the PL intensity of (Ba,Sr)LaZnTaO6:xMn4+ phosphors decreases with increasing temperature. The SrLaZnTaO6:xMn4+ sample has better thermal stability than BaLaZnTaO6:xMn4+. Interestingly, (Ba,Sr)LaZnTaO6:0.008Mn4+ exhibits outstanding internal quantum efficiency (IQE ≥ 80%). Finally, the fabricated LEDs were combined with SrLaZnTaO6:0.008Mn4+ phosphors combined with 460 nm InGaN chips, which emit blue and red light. Based on the above properties, the rare-earth-free (Ba,Sr)LaZnTaO6:xMn4+ phosphors have great potential in being applied as far-red emitting phosphors in high-power plant growth LEDS.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Decai Huang,Sisi Liang,Dejian Chen,Jie Hu,Kunyuan Xu,Haomiao Zhu
The emerging applications of near-infrared (NIR) spectroscopy technology in medicine and food security call for compact and efficient NIR light source such as NIR phosphor converted LEDs (pc-LED). Currently, most of the NIR phosphors suffer from low photoluminescence (PL) quantum yield and poor thermal or chemical stability. Herein, a fluoride garnet NIR Na 3 Al 2 Li 3 F 12 :Cr 3+ phosphor was successfully synthesized via coprecipitation method. It can be excited efficiently by blue or red light and shows a broad emission band covering 650–1000 nm (bandwidth of ~110 nm) with a PL quantum yield of 78%. The fine electronic structure of Cr 3+ ions in the host was revealed by the measurement of temperature-dependent (8–300 K) excitation and emission spectra analysis. Particularly, at 423 K, the Na 3 Al 2 Li 3 F 12 :5%Cr 3+ sample retained ~99% of the PL intensity at room temperature, exhibiting excellent PL thermal stability. A NIR pc-LED was fabricated by combining the Na 3 Al 2 Li 3 F 12 :5%Cr 3+ phosphor with a commercial blue LED chip, and radiant flux of 14.3 mW in NIR region was obtained at 60 mA drive current. Furthermore, the penetration of NIR light generated by this pc-LED in chicken breast was reached. The results suggested that Na 3 Al 2 Li 3 F 12 :Cr 3+ is a promising candidate for broadband pc-LED in NIR spectroscopy applications.
研究领域:
材料科学
·
光学工程
·
生物医学光子学
·
半导体器件
·
分析化学
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