Nano Wave Plates Structuring and Index Matching in Transparent Hydroxyapatite-YAG: Ce Composite Ceramics for High Luminous Efficiency White Light-Emitting Diodes
Nano Wave Plates Structuring and Index Matching in Transparent Hydroxyapatite-YAG: Ce Composite Ceramics for High Luminous Efficiency White Light-Emitting Diodes
复制标题
透明羟基磷灰石-YAG 中的纳米波片结构和折射率匹配：用于高发光效率白色发光二极管的 Ce 复合陶瓷。
DOI：
10.1002/adma.201905951
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发表时间：
2019-11-19
影响因子：
29.4
通讯作者：
Jiang, Wan
中科院分区：
文献类型：
--
作者：
Huang, Ping;Zhou, Beiying;Jiang, Wan
用陶瓷中的磷取代传统的有机硅或树脂作为颜色转换器是提高大功率白光发光二极管(WLED)热稳定性的有效途径。然而，现有PICS中过度的光散射会导致巨大的磷光转换光损失，这使得当前PICS颜色转换器的亮度效率较低，这意味着它们只能用于工作在反射模式下的设备。通过引入纳米波片结构和瑞利散射，以介孔羟基磷灰石(HA)纳米棒和YAG：Ce荧光粉为原料，在850℃下制备了HA-YAG：Ce发光陶瓷，首次实现了具有PIC色彩转换的WLED的透射式发光。在低温烧结和高透明基质的情况下，HA-YAG：Ce的量子产率保持了约90%的原始荧光粉，而带有颜色转换器的WLED显示出创纪录的170lmW-1的发光效率和低于4500K的相关色温。本文提出了一种简单实用的策略，即利用纳米结构调制来消除双折射诱导的光散射，以制备适用于多模灯具的高性能陶瓷转换器。
Replacing traditional luminous silicone or resins with phosphor in ceramics (PiCs) as color converters has been proposed as an efficient way to improve thermal stability of high-power white light-emitting diodes (WLEDs). However, excessive light scattering in existing PiCs results in enormous phosphor-converted light losses, which makes the luminosity of current PiCs color converters less efficient and means that they can only be used in devices working in reflective mode. By introducing nano wave plate structuring and Rayleigh scattering, luminous hydroxyapatite (HA)-YAG: Ce ceramics are prepared from mesoporous HA nanorods and YAG: Ce phosphors at 850 degrees C, enabling for the first time WLEDs equipped with PiC color converters in transmission mode. With low-temperature sintering and a highly transparent matrix, the quantum yield of HA-YAG: Ce retains approximate to 90% of the raw phosphor, and WLEDs with the color converters exhibit a record luminous efficiency of 170 lm W-1 and a correlated color temperature below 4500 K. A facile and practical strategy of using nano structural modulation to eliminate birefringence-induced light scattering for fabricating high-performance ceramic converters suitable for multiple mode luminaires is demonstrated.