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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高影响因子
PHYSICA B-CONDENSED MATTER
·
2026
·
IF 3.2
Sichao Chen,Xiang Zhang,Ting Yao,Keke Wang,Lei Cao,Shixian Xiong
In this study, cerium-doped yttrium aluminum garnet (YAG:Ce) phosphors were synthesized via citric acid-assisted aerosol spray pyrolysis to optimize their luminescent properties for white light-emitting diode (LED) applications. Precursor solutions formulated with nitrates and citric acid were atomized and subsequently calcined at 1000 °C, yielding hollow spherical particles with an average diameter of 700-800 nm. X-ray diffraction (XRD) analysis revealed that pure cubic YAG phase was formed above 800 °C. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations disclosed the porous hollow morphology of the particles. By adjusting the Ce 3+ doping concentration (0.01%-3%), it was found that doping concentrations of 1-2% exhibited the strongest emission intensity under 450 nm excitation, with the emission peak located at 550 nm. Beyond 2% doping, a decrease in intensity was observed due to concentration quenching. These results demonstrated that aerosol spray pyrolysis could effectively produce high-quality YAG:Ce phosphors with controllable morphology and excellent optical properties, rendering them suitable for advanced lighting technologies.
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高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 2
·1465-1477
·
IF 3.2
Xu Chen,Mingyuan Liu,Chunming Zhou,Chunming Zhou,Hang Chen,Tianyuan Zhou,Tianyuan Zhou,Yanbin Li,Yanbin Li,Shenghui Lin,Cong Wei,Cen Shao,Cen Shao,Guannan Chen,Guannan Chen,Jian Kang,Jian Kang,Pengde Han,Wieslaw Strek,Hao Chen,Hao Chen,Le Zhang,Le Zhang,Le Zhang,Le Zhang
High power and high brightness laser lighting puts forward new requirements for phosphor converters such as high luminous efficiency, high thermal conductivity and high saturation threshold due to the severe thermal effect. The structure design of phosphor converters is proposed as what we believe to be a novel strategy for less heat production and more heat conduction. In this work, the rod-shaped YAG:Ce phosphor ceramics (PCs) and disc-shaped YAG:Ce PCs as control group were fabricated by the gel casting and vacuum sintering, to comparatively study the luminescence performance for LD lighting, on the premise that the total number of transverse Ce3+ ions and the volume of samples from two comparison groups were same. All rod YAG:Ce PCs with low Ce3+ concentration exhibited the high luminous efficiency and better thermal stability than YAG:Ce discs with high Ce3+ concentration. Under the laser power density of 47.8 W/mm2, the luminous saturation was never observed in all rod-shaped YAG:Ce PCs. The high luminous efficacy of 245∼274 lm/W, CRI of 56.3∼59.5 and CCT of 4509∼4478 K were achieved. More importantly, due to the extremely low Ce3+ doping concentration (0.01 at%), rod-shaped ceramics based LDs devices showed the excellent thermal performance and their surface temperatures were even below 30.5 °C surprisingly under the laser power density of 20.3 W·mm-2 (2 W). These results indicate that the rod shape of phosphor converter is a promising structure engineering for high power laser lighting.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qiang-Qiang Zhu,Shuxing Li,Qiang Yuan,Hong Zhang,Le Wang
Yellow-emitting YAG:Ce transparent ceramic is recognized as an ideal color converter in high-power blue LEDs and LDs , but the absence of scattering centers in its microstructure leads to a low light extraction efficiency and poor light uniformity. Here, taking advantage of the scattering effect and the transparency of YAG:Ce ceramics, Ce-free YAG phase was used as a second component to form a composite with YAG:Ce phosphor. The sintered YAG:Ce-YAG ceramic possessed a high transparency of ∼63 % and a thermal conductivity of 8.9 Wm −1 K −1 . Due to its beneficial thermal properties and high external quantum efficiency of 70.2 %, the YAG:Ce-YAG ceramic could be excited under a high blue-laser flux density of up to 9.60 W/mm 2 and showed a luminous emittance of 1220 lm/mm 2 . Due to light scattering arising from the slightly different refractive indices of the two phases, the designed YAG:Ce-YAG ceramic showed better lighting effects than a single-phase transparent YAG:Ce ceramic.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi Xie,Huanyu Zhao,Wenlong Zhou,Mu Zhang,Zhaolin Na,Xudong Sun
The application of laser-driven lighting is constrained by the thermal quenching and poor color quality of phosphor converters. In this study, novel ZnO–YAG:Ce composite ceramics were successfully fabricated by vacuum hot-pressing. The addition of ZnO effectively enhanced the thermal conductivities of the composite ceramics. Moreover, ZnO exhibited good chemical compatibility with YAG and low densification temperatures, which led to excellent thermal and optical properties of the composite ceramics. The maximal luminescence saturation threshold of 10 W/mm 2 with a luminous flux of 1243 lm was achieved for ZnO–20 %YAG:Ce. Furthermore, ZnO–YAG:Ce composite ceramic phosphors showed higher color rendering index (CRI) than that of the YAG–YAG:Ce due to their additional green emission and broadened spectra under excitation of blue LDs, indicating excellent color quality of the ZnO–YAG:Ce composite ceramic phosphor for laser-driven lighting.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yujie Li,Jing Li,Jie Chen,Hui Lin,Yang Tang,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Ceramic phosphors offer extremely high brightness and are well-suited for low-etendue optical systems. However, efficient heat dissipation under high-power-density excitation remains a key challenge. In this work, the influence of Al 2 O 3 addition on the densification, photoluminescence performance, and laser-induced damage behavior of YAG:Ce ceramic phosphors is systematically investigated. The main contribution of this study is to reveal the trade-off between low etendue and effective thermal management. The results show that a suitable amount of Al 2 O 3 addition can promote grain growth and reduce porosity. Under low power density, the emission intensity is maximized at moderate Al 2 O 3 content. As the power density increases, samples with higher Al 2 O 3 content exhibit more stable emission due to enhanced thermal conductivity and improved heat dissipation. The 20 wt% sample achieves balanced performance, exhibiting a relatively small emission spot that ensures low etendue while maintaining a comparably higher damage threshold, representing a key trade-off between low etendue and efficient thermal management.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Qi Qiu,Manjie Huang,Weimeng Zheng,Chaoyan Xuan,Yong Wan,Bo Zhang,Zhongkuan Luo,Weizhong Lv
Systematic study on the impact of the pH value was performed in the preparation of YAG:Ce nanophosphor powders by reverse titration method. Therefore, we used wider range of the pH values from 5.0 to 8.3 for the synthesis, correlating closely with ratio R of the total metal ions to precipitant ammonium hydrocarbonate in the solution from 1:3 to 1:9. The calcination temperatures of 1050 °C and 1300 °C were tested for the crystallization of YAG:Ce nanophosphors. Acidic condition is more preferable for improved YAG:Ce nanophosphors through XRD spectra analysis for the type of crystals and the crystal size. The molar ratio Y 3+ /Al 3+ in the precursor was controlled at the level of R =1:3 to keep the stoichiometric ratio of YAG:Ce. SEM images showed the YAG:Ce nanophosphors prepared at acidic condition having smaller crystal size and improved dispersibility. Fluorescence spectrum displayed much stronger emission at R =1:3. The molar ratio R is a vital factor to control the quality of the YAG:Ce powders. The nanophosphors prepared at R =1:3 possessed the best fluorescence emission.
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高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 9
·4781-4790
·
IF 5.1
Hailiang Fang,Lei Li,Beiying Zhou,Weijie Li,Shijia Gu,Qi Zheng,Lianjun Wang,Wan Jiang
Composite phosphor ceramics (CPCs) have found extensive applications in high-power, high-brightness LD lighting, primarily due to their superior thermal conductivity, stability and microstructural tailorability. However, the high sintering temperatures and refractive index mismatches of CPCs impose a significant impact on their luminous efficacy and practical application. To address these challenges, this study introduces a novel approach utilizing reactive spark plasma sintering of mesoporous Y2O3 and Al2O3 powders and YAG:Ce phosphors. This approach leverages the enhanced driving forces stemming from mesoporous structure collapse and phase transformation, enabling the rapid preparation of dense polycrystalline YAG–YAG:Ce CPCs at a significantly reduced sintering temperature of 1350 °C and a short holding time of 3 minutes. Owing to the minimal refractive index difference and designed differential grain sizes, the resultant CPC exhibits a high internal quantum efficiency of 83.8%, which approaches 95.6% of that observed in YAG:Ce phosphors. When subjected to irradiation by a 450 nm laser diode, the as-prepared CPC produces white light with a remarkable luminous efficacy of 202.13 lm W−1 and a low correlated color temperature of 5298 K, highlighting the enhanced light conversion efficiency. Furthermore, the CPC presents a substantial enhancement in thermal stability, experiencing only a 6% luminescence loss at 200 °C, and could endure a high laser flux density of up to 6.68 W mm−2. These results demonstrate that the optimized YAG–YAG:Ce CPCs are well suited for solid-state laser lighting, and contribute to the ongoing advancement of next-generation lighting technologies.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Bingguo Liu,Jiafu Zhang,Xinrong Chen,Heyu Wang,Feng Wang,Yangzi Li,Dan Zhao,Zhe Guan,Jian Xu,Baoli Du,Dennis Dan Corell,Carsten Dam-Hansen,Ole Bjarlin Jensen
Free from the “curse” of efficiency droop in high-power LEDs, laser-driven phosphor-converted laser diodes (pc-LDs) light sources demonstrate significantly greater potential in achieving ultra-high brightness white light. To mitigate the luminance saturation, rigorous re-optimization of luminescent ion concentration and heat dissipation geometry is essential. Beyond the photometric and colorimetric properties, the low spatial uniformity of pc-LDs poses a critical but often overlooked challenge. Here, we present a systematic investigation of the effect of Ce 3+ concentration and thickness on the luminance and uniformity of YAG:Ce ceramic color converters. To quantitatively assess luminescence uniformity, high dynamic range color images were captured to statistically evaluate spatial chromaticity variations across the luminescent spot. The results firmly demonstrated that the Ce 3+ concentration and thickness are two interdependent parameters closely related to uniform chromaticity and luminance, which should be optimized simultaneously. This study provides critical optimization guidelines for laser lighting development.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 13
·3901-3908
·
IF 6.641
Jinchun Wang,Xueyuan Tang,Peng Zheng,Shuxing Li,Tianliang Zhou,Rong-Jun Xie
Achieving super-high brightness laser-driven solid state lighting in a transmissive mode is significantly limited by the thermal robustness and light extraction efficiency of color converter materials. Therefore, it is a must to enhance the thermal conductivity and conversion efficiency of color converters by appropriate compositional design and microstructural tailoring. In this work, we propose thermally self-managing YAG:Ce–Al2O3 composite ceramic color converters that consist of luminescent YAG:Ce phosphor particles embedded in a thermally conductive Al2O3 matrix, which allows them to be combined with high-power blue laser diodes to create super-high brightness white laser-driven light without using any heat sink. The thermal conductivity of the ceramic color converters increases linearly from 10.2 to 32.5 W m−1 K−1 as the Al2O3 content varies from 0 to 90 wt%. Impressively, the composite ceramic with 60 wt% Al2O3 can withstand an incident laser power density of up to 20.1 W mm−2. A high-brightness white laser-driven light is obtained with a luminance of 982 Mcd m−2. Moreover, the secondary Al2O3 particles also act as scattering centers and enhance the light conversion efficiency. A maximum luminous efficacy of 157 lm W−1 is achieved under 11.94 W mm−2 blue laser excitation at an Al2O3 content of 24 wt%, increased by 27.3% compared to the Al2O3-free YAG:Ce ceramic. The as-designed YAG:Ce–Al2O3 phosphor ceramics thus validate their great suitability in high-power and high-brightness laser-driven solid-state lighting.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiaolong Zhang,Kailong Ma,Shuo Wang,Pengchong Zhang,Lei Wu,Pengfei Li,Jinsheng Li,Xiwei Qi
The inadequate dissipation of heat and the suboptimal color quality of phosphor converters have been identified as critical constraints in the implementation of laser-driven lighting technology. In recent years, laser lighting has attracted significant attention as a pivotal direction for next-generation illumination systems. However, the thermal quenching effect induced by high-power blue laser sources significantly reduces the emission efficiency of phosphors, presenting a critical challenge that demands urgent resolution. In this study, we successfully fabricated AlN-YAG:Ce composite amorphous spheres by using the non-container solidification technique. The theoretical thermal conductivity of the glass-ceramic with 15 wt% AlN added was 23.13 W/(m∙K). Addressing the inherent limitation of weak luminescent properties in amorphous materials, crystallization treatment was implemented while preserving their advantageous characteristics. The amorphous crystallization treatment was found to be a successful method of achieving controllable optimization of high-efficiency luminescent performance. This objective was achieved through significantly enhancing emission efficiency via localized crystallization (formation of nanocrystalline or microcrystalline structures) in amorphous materials. Through systematic optimization and evaluation, the 15% AlN-YAG:Ce crystallized at 951 °Cglass-ceramic sample with an optimized thickness of 1 mm exhibited exceptional performance: under 1 W/mm 2 blue laser excitation, it achieved a luminous efficacy of 335.3 lm/W with a blue light absorptivity of 89.7% and a low correlated color temperature of 4405.4 K. The technology employed for the composite glass-ceramic's preparation offers a novel solution for the advancement of laser lighting technology.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chunming Zhou,Hang Chen,Yue Cao,Yanbin Li,Tianyuan Zhou,Chaofan Shi,Dongshun Chen,Xu Chen,Shenghui Lin,Xuanchu Liu,Jian Kang,Cen Shao,Wieslaw Strek,Hao Chen,Le Zhang
Phosphor converters with excellent thermal performance and high color rendering index (CRI) demonstrate vast application prospects in the field of laser diodes (LDs) lighting. Nevertheless, the significant heat accumulation within the converters and the absence of red spectral components pose challenges in achieving both a high saturation threshold and a high CRI for Y 3 Al 5 O 12 :Ce phosphor converters destined for white LDs. In this work, Mg 2 Al 4 Si 5 O 18 :Eu/Y 3 Al 5 O 12 :Ce (MAS:Eu/YAG:Ce) composite phosphor converters with excellent thermal performance and enhanced CRI were designed and fabricated for reflective laser lighting. Impressively, MAS:Eu/YAG:Ce phosphor-glass-ceramic composites (PGCC) retained a remarkable 97.8 % of the room temperature emission intensity at 150 °C. The reasons for this could be attributed to the strong thermal quenching resistance exhibited by MAS:Eu phosphors, as well as the ultra-thin glass bonding layer of about 150–200 μm. Meanwhile, by integrating the MAS:Eu/YAG:Ce PGCC with a 450 nm laser source, white LD devices operating in a remote excitation mode were fabricated. These white LDs demonstrated an improved CRI of 76 and maintained a low surface temperature of 131.7 °C under an ultra-high laser power density of 47.8 W/mm 2 (laser power ∼ 4.70 W). Moreover, the maximum luminous flux and luminous efficiency of the white LDs were 484 lm and 103 lm/W, respectively. Therefore, the design of MAS:Eu/YAG:Ce composite phosphor converters offers a new approach for the development of high-power white LDs.
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高影响因子
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