A new CaF2-YAG: Ce composite phosphor ceramic for high-power and high-color-rendering WLEDs
A new CaF2-YAG: Ce composite phosphor ceramic for high-power and high-color-rendering WLEDs
复制标题
一种用于高功率、高显色性 WLED 的新型 CaF2-YAG:Ce 复合荧光粉陶瓷
DOI：
10.1039/c9tc02407g
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发表时间：
2019-07-28
影响因子：
6.4
通讯作者：
Xie, Rong-Jun
中科院分区：
文献类型：
--
作者：
Gu, Chi;Wang, Xiao-Jun;Xie, Rong-Jun
具有热稳定性和光学透明性的磷光体陶瓷作为高功率白色发光二极管（WLED）的发光材料正引起人们的极大关注。在这里，我们报告了一种新的CaF 2-YAG：Ce磷光体陶瓷，其中黄色发光YAG：Ce颗粒嵌入在非发光CaF 2陶瓷基质中。该复合荧光粉陶瓷是在700 ℃的低温烧结条件下，通过简单的热压方法制备的。YAG：Ce颗粒和CaF 2基体之间没有发生可检测的界面反应。由于CaF 2优异的光学性能和高热导率，所制备的CaF 2-YAG：Ce磷光体陶瓷显示出高量子效率（IQE = 83.2%）和低热猝灭（在150 ℃下仅9%的发光损失）。通过将CaF 2-YAG：Ce磷光体陶瓷与2 W的460 nm蓝光芯片组合而制造的WLED呈现明亮的白色光，其光通量为359.7lm，色温为4021-7941 K，显色指数为70.1-82.7。复合荧光粉陶瓷显示出比传统单相YAG：Ce陶瓷更好的性能，使其能够用于大功率WLED。
Thermally robust and optically transparent phosphor ceramics are now attracting great attention as promising luminescent materials for high-power white light-emitting diodes (WLEDs). Here, we report a new CaF2-YAG: Ce phosphor ceramic in which the yellow-emitting YAG: Ce particles are embedded in a non-luminescent CaF2 ceramic matrix. The composite phosphor ceramic was fabricated at a very low sintering temperature of 700 degrees C by using a simple hot-pressing method. No detectable interfacial reaction occurs between the YAG: Ce particle and the CaF2 matrix. Owing to the excellent optical properties and high thermal conductivity of CaF2, the prepared CaF2-YAG: Ce phosphor ceramic shows a high quantum efficiency (IQE = 83.2%), and a low thermal quenching (only 9% loss in luminescence at 150 degrees C). WLEDs, fabricated by combining the CaF2-YAG: Ce phosphor ceramic with a 460 nm blue chip of 2 W, exhibited bright white light with a luminous flux of 359.7 lm, a color temperature of 4021-7941 K and a color rendering index of 70.1-82.7. The composite phosphor ceramic showed a better performance than the traditional single-phase YAG: Ce ceramic, enabling it to be used in high-power WLEDs.