Fabrication of stacked color converter for high-power WLEDs with ultra-high color rendering
Fabrication of stacked color converter for high-power WLEDs with ultra-high color rendering
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DOI：
10.1016/j.jallcom.2020.156811
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发表时间：
2021-01
影响因子：
6.2
通讯作者：
Yang Peng;Qinglei Sun;Jiaxin Liu;Hao-Chun Cheng;Yun Mou
中科院分区：
文献类型：
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作者：
Yang Peng;Qinglei Sun;Jiaxin Liu;Hao-Chun Cheng;Yun Mou
在一些颜色关键的照明应用中，强烈需要具有高显色性的白色发光二极管（WLED）。然而，开发具有宽发射的稳定的颜色转换器仍然是大功率WLED的突出挑战。在此，红色CaAlSiN 3：Eu 2+（CASN）有机硅磷光体（PiS）层涂覆在绿色Y3Al3.08Ga1.92O12：Ce 3+（YAGG）玻璃磷光体（PiG）上的堆叠颜色转换器被制造以实现用于大功率WLED的超高显色性。将YAGG荧光粉与硼硅酸盐玻璃基体混合，通过印刷、烧结的方法制备YAGG PiG，然后在YAGG PiG上涂覆CASN PiS层。控制PiS的厚度以调节转换器的发光。由于蓝绿色谷的补偿，该转换器表现出宽的发射。该转换器能够实现具有超高显色性（Ra= 96.1，R9= 90.1，R13= 98.5; Rf= 92，Rg= 100）和色度坐标（0.367，0.372）的纯白色光。WLED在不同的驱动电流下实现稳定的颜色质量。
White light-emitting diodes (WLEDs) with high color rendering is strong required in some color-critical lighting applications. However, developing a stable color converter with broad emission remains an outstanding challenge for high-power WLEDs. Herein, a stacked color converter of red CaAlSiN3:Eu2+(CASN) phosphor-in-silicone (PiS) layer coated on a green Y3Al3.08Ga1.92O12:Ce3+(YAGG) phosphor-in-glass (PiG) was fabricated to realize ultra-high color rendering for high-power WLEDs. The YAGG PiG was prepared by printing and sintering the mixture of YAGG phosphor and borosilicate glass matrix, and then the CASN PiS layer was coated the YAGG PiG. The PiS thickness was controlled to adjust the luminescence of converters. The converter exhibits a broad emission due to the compensation of cyan valley. The converter enables a pure white light with an ultra-high color rendering (Ra= 96.1, R9= 90.1, R13= 98.5; Rf= 92, Rg= 100) and chromaticity coordinates (0.367, 0.372). The WLED achieves stable color quality under various driving currents.