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| 高光效、大功率LEDs/LDs用Ce:YAG透明陶瓷 | |
| 引用本文： | 杜傲宸,杜琪源,刘欣,杨益民,夏晨阳,邹军,李江.高光效、大功率LEDs/LDs用Ce:YAG透明陶瓷[J].无机材料学报,2021,36(8):883-892. |
| 作者姓名： | 杜傲宸 杜琪源 刘欣 杨益民 夏晨阳 邹军 李江 |
| 作者单位： | 1.吉林建筑大学 材料科学与工程学院, 长春130118 2.中国科学院 上海硅酸盐研究所, 透明光功能无机材料重点实验室, 上海201899 3.上海应用技术大学 理学院, 上海201418 4.中国科学院大学 材料与光电研究中心, 北京 100049 |
| 摘 要： | Ce:YAG透明陶瓷可与蓝光LEDs/LDs复合, 用于大功率白光LEDs/LDs。本研究通过调整Ce:YAG透明陶瓷的厚度和Ce3+的掺杂浓度, 将组装器件的发射光谱和色坐标从冷白区调整到暖白区。以高纯(≥99.99%)商业粉体α-Al2O3、Y2O3、CeO2为原料, 采用固相反应法制备了(CexY1-x)3Al5O12 (x=0.0005、0.0010、0.0030、0.0050、0.0070和0.0100)透明陶瓷。陶瓷素坯在1750 ℃真空烧结20 h(真空度5.0×10-5 Pa), 之后在马弗炉中退火1450 ℃×10 h。不同掺杂浓度Ce:YAG陶瓷(厚度分别为0.2、0.4、1.0 mm)在800 nm处的直线透过率均大于79%。Ce:YAG荧光陶瓷的热导率随着测试温度和掺杂浓度的增加而降低。采用有限元方法模拟不同厚度的Ce:YAG陶瓷和LED组装的热分布, 比较了三种封装方式的热分布。将Ce:YAG荧光陶瓷与LEDs/LDs复合, 制备出色坐标分别为(0.3319, 0.3827)和(0.3298, 0.3272)的白光, 发光效率分别为122.4和201.5 lm/W。将Ce:YAG荧光陶瓷和10、50 W商用蓝光LED芯片组合成熟灯具, 可用于商业用途。Ce:YAG透明陶瓷在大功率照明和显示的彩色转换材料应用领域极具潜力。 |
| 关 键 词： | LEDs/LDs照明 光致发光 Ce:YAG 荧光陶瓷 |
| 收稿时间： | 2020-12-18 |
| 修稿时间： | 2021-01-24 |
Ce:YAG Transparent Ceramics Enabling High Luminous Efficacy for High-power LEDs/LDs |
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| DU Aochen,DU Qiyuan,LIU Xin,YANG Yimin,XIA Chenyang,ZOU Jun,LI Jiang.Ce:YAG Transparent Ceramics Enabling High Luminous Efficacy for High-power LEDs/LDs[J].Journal of Inorganic Materials,2021,36(8):883-892. | |
| Authors: | DU Aochen DU Qiyuan LIU Xin YANG Yimin XIA Chenyang ZOU Jun LI Jiang |
| Affiliation: | 1. School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China 2. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China 3. School of Science, Shanghai Institute of Technology, Shanghai, 201418, China 4. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Ce:YAG transparent ceramics could be combined with blue LEDs/LDs, for applications of high power white LEDs/LDs. In this study, it is found that by adjusting the thickness of Ce:YAG transparent ceramics and the doping concentration of Ce3+, the emission spectra and color coordinates of the assembled devices can be adjusted from the cold white region to the warm white region. (CexY1-x)3Al5O12 (x=0.0005, 0.0010, 0.0030, 0.0050, 0.0070 and 0.0100) transparent ceramics was fabricated by a solid state reaction method, with the high pure (≥99.99%) commercial powdersα-Al2O3, Y2O3 and CeO2 using as raw materials. The ceramic green bodies were sintered in 1750 ℃ for 20 h under vacuum of 5.0×10-5 Pa, and the ceramics were annealed at 1450 ℃ for 10 h in the muffle furnace. The in-line transmittance of double polished Ce:YAG ceramics is higher than 79% at 800 nm (0.2, 0.4, 1.0 mm in thickness, respectively). The thermal conductivity of Ce:YAG transparent ceramics decreases with the increase of measuring temperature and doping concentration. Thermal distribution of ceramics and LEDs with different thicknesses was simulated by the finite element method, and the thermal distributions of three packaging modes were compared. White light with chromaticity coordinates of (0.3319, 0.3827) and (0.3298, 0.3272) and luminous efficiency of 122.4 and 201.5 lm/W were prepared by combining transparent ceramics with LEDs/LDs. We combined Ce:YAG transparent ceramics and blue LEDs chips to produce 10 and 50 W mature lamps, which can be used for commercial purposes. Therefore, the Ce:YAG transparent ceramics is a highly promising color conversion material for high power lighting and displaying applications in the future. |
| Keywords: | LEDs/LDs illumination photoluminescence Ce:YAG ceramic phosphor |
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