An excellent cyan-emitting orthosilicate phosphor for NUV-pumped white LED application
An excellent cyan-emitting orthosilicate phosphor for NUV-pumped white LED application
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适用于 NUV 泵浦白光 LED 应用的优异青色发射原硅酸盐荧光粉
DOI：
10.1039/c7tc04168c
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发表时间：
2017-12-21
影响因子：
6.4
通讯作者：
Jiang, Haochuan
中科院分区：
文献类型：
--
作者：
Liu, Yongfu;Silver, Jack;Jiang, Haochuan
本文报道了一种蓝绿色荧光粉BLS：Ce ~（3+），它具有宽的发射带，可同时覆盖可见光谱的蓝区和绿色区，可代替蓝、绿色荧光粉。BLS：Ce 3+的激发峰位于400 nm处，与高效近紫外（NUV）芯片的发射光匹配良好。BLS：Ce 3+磷光体在室温（RT）下具有高于90%的内量子效率（IQE）和优异的热稳定性（相对于室温下的IQE，在150 °C下略微降低3%），并且是环境稳健的（相对于室温IQE值，在85 °C/85%RH下老化1600小时后发生6%的小幅降解）。使用BLS：Ce 3+荧光粉，仅与CaAlSiN 3：Eu 2+红色荧光粉和395 nm NUV芯片耦合，实现了具有90.6的高显色指数的NUV基WLED。此外，发光效率高达32.2 lm W-1，这比使用三种荧光体（蓝色、绿色和红色）的NUV-WLED的发光效率好得多。
In this paper, a cyan-emitting phosphor BLS:Ce3+ is reported that has a broad emission band covering both the blue and green regions of the visible spectrum, which can be used instead of two separate blue and green phosphors. The excitation peak of BLS:Ce3+ is located at 400 nm, which matches well with the emission light of efficient near-ultraviolet (NUV) chips. The BLS:Ce3+ phosphor has an internal quantum efficiency (IQE) higher than 90% at room temperature (RT) and an excellent thermal stability (a small reduction of 3% at 150 °C relative to the IQE at RT) and is environmentally robust (a small degradation of 6% occurs after aging for 1600 h at 85 °C/85% RH relative to the room-temperature IQE value). Using the BLS:Ce3+ phosphor, coupled only with a CaAlSiN3:Eu2+ red phosphor and a 395 nm NUV chip, a NUV-based WLED with a high color rendering index of 90.6 has been achieved. Moreover, the luminous efficiency reaches as high as 32.2 lm W−1, which is much better than that of the NUV-WLEDs employing three phosphors (blue, green and red).