Fluorescence properties of Mn4+ in CaAl12O19 compounds as red-emitting phosphor for white LED
Fluorescence properties of Mn4+ in CaAl12O19 compounds as red-emitting phosphor for white LED
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DOI：
10.1016/j.jlumin.2005.01.003
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发表时间：
2005-09-01
影响因子：
3.6
通讯作者：
Hase, T
中科院分区：
文献类型：
--
作者：
Murata, T;Tanoue, T;Hase, T
研究了固相反应制备的CaAl12O19化合物中Mn4+离子的红色荧光特性，以寻找白光LED发光荧光粉的候选材料。由于Mn4+的E-2 -> (4)A(2)跃迁，CaAl12O19:Mn4+的荧光光谱由656 nm处的主峰和三个卫星峰组成。激发光谱在250 ~ 550 nm之间有较宽的波段，在338、398和468 nm附近有三个峰。在400 nm处激发的荧光强度与在338 nm处的激发光谱峰相比约为80%，对应于gan基led的波长。测得的红色荧光色度为x = 0.728, y = 0.269。CaAl12O19:Mn4+具有良好的激发光谱分布和色度，适合作为白光LED的红发荧光粉。从通量和电荷补偿效应的角度讨论了CaF2和MgF2的加入对CaAl12O19:Mn4+相对荧光强度的影响。(c) 2005 Elsevier B.V.版权所有
Red fluorescence properties of Mn4+ ions in CaAl12O19 compounds prepared by the solid-state reaction were investigated in order to seek a candidate for red-emitting phosphor of white LED. The fluorescence spectrum of CaAl12O19:Mn4+ consists of main peak at 656 nm with three satellite peaks due to the E-2 -> (4)A(2) transition of Mn4+. The excitation spectrum exhibits a broad band between 250 and 550 nm with three peaks occurring around 338, 398, and 468 urn. The fluorescence intensity excited at 400 nm, which correspond to the wavelength of GaN-based LEDs, is about 80% compared with the excitation spectrum peak at 338 nm. The measured chromaticity of red fluorescence is x = 0.728, y = 0.269. CaAl12O19:Mn4+ would be suitable for red-emitting phosphor of white LED because CaAl12O19:Mn4+ is excellent in the excitation spectral profile and the chromaticity. The effect of CaF2 and MgF2 additions on the relative fluorescence intensity of CaAl12O19:Mn4+ is discussed in terms of the flux and charge compensation effects. (c) 2005 Elsevier B.V. All rights reserved.