Xu Hui-Bing, Zhuang Wei-Dong, Wang Le, Liu Rong-Hui, Liu Yuan-Hong, Liu Li-Hong, Cho Yujin, Hirosaki Naoto, Xie Rong-Jun
National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co., Ltd. , Beijing, 100088, China.
Sialon Group, National Institute for Materials Science , 1-1 Namiki, Tsukuba, 305-0044, Japan.
Inorg Chem. 2017 Nov 20;56(22):14170-14177. doi: 10.1021/acs.inorgchem.7b02310. Epub 2017 Nov 7.
Eu-doped LaSiNO phosphors were synthesized by the high temperature solid-state method, and their photoluminescence properties were investigated in this work. LaSiNO:Eu exhibits a strong broad absorption band centered at 320 nm, spanning the spectral range of 300-600 nm due to 4f → 4f5d electronic transitions of Eu. The emission spectra show a broad and asymmetric band peaking at 481-513 nm depending on the Eu concentration, and the emission color can be tuned in a broad range owing to the energy transfer between Eu ions occupying two independent crystallographic sites. Compared to the Ce-doped LaSiNO, the Eu-doped one shows a larger thermal quenching, predominantly owing to photoionization. Under 320 nm excitation, the internal and external quantum efficiencies are 44 and 33%, respectively.
采用高温固相法合成了铕掺杂的LaSiNO荧光粉，并对其光致发光性能进行了研究。LaSiNO:Eu由于Eu的4f→4f5d电子跃迁，在320nm处呈现出一个强的宽吸收带，覆盖300 - 600nm的光谱范围。发射光谱显示出一个宽的不对称带，其峰值在481 - 513nm之间，取决于Eu的浓度，并且由于占据两个独立晶体学位置的Eu离子之间的能量转移，发射颜色可以在很宽的范围内调节。与铈掺杂的LaSiNO相比，铕掺杂的LaSiNO表现出更大的热猝灭，主要是由于光致电离。在320nm激发下，内量子效率和外量子效率分别为44%和33%。
