Yb3+/Ho3+/Tm3+ 共掺杂碲酸盐玻璃的白光上转换发光及其机理

[White light upconversion luminescence and its mechanism of Yb3+/Ho3+/Tm3+ co-doped tellurite glass].

作者信息

Pan Xin-xiang, Zhong Hai-yang, Xing Ming-ming, Wang Yi-zhuo

机构信息

Marine Engineering College, Dalian Maritime University, Dalian 116026, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Feb;32(2):309-12.

PMID:22512158

Abstract

Yb3+ /Ho3+, Yb3+ /Tm3+ and Yb3+ /Ho3+ /Tm3+ co-doped tellurite glasses were prepared by melt-quenching method. Under the excitation of 980 nm laser, Yb3+ /Ho3+/Tm3+ co-doped glass sample shows strong blue, green and red emissions, corresponding to the transitions 1G4 --> 3H6 of Tm3+, 5F4 (5S2) --> 5 I8 of Ho3+, as well as 5F5 -->5 I8 of Ho3+ and 1G4 --> 3F4 of Tm3+ ions, respectively. It was found that the integrated emission intensity ratio of the red to green in Yb3+/Ho3+ /Tm3+ co-doped sample (3.95) is greater than that in Yb3+/Ho3+ co-doped sample (1.69) due to the cross-relaxation between Ho3+ and Tm3+ ions : 3H4 (Tm3+) + 5 I6 (Ho3+) -->3F4 (Tm3+) + 5F5 (Ho3+), and 3F4 (Tm3+ ) + 5 I8 (Ho3+) --> 3H6 (Tm3+) +5 I7 (Ho3+). When the pump power density is 8.2 W x cm(-2), the calculated color coordinates of Yb3+ /Ho3+ /Tm3+ co-doped sample are x = 0.345, y = 0.338, which is very close to the equal energy white light (x = 0.333, y = 0.333).

摘要

采用熔融淬火法制备了Yb3+/Ho3+、Yb3+/Tm3+和Yb3+/Ho3+/Tm3+共掺杂碲酸盐玻璃。在980nm激光激发下，Yb3+/Ho3+/Tm3+共掺杂玻璃样品呈现出强烈的蓝光、绿光和红光发射，分别对应于Tm3+离子的1G4→3H6跃迁、Ho3+离子的5F4(5S2)→5I8跃迁，以及Ho3+离子的5F5→5I8跃迁和Tm3+离子的1G4→3F4跃迁。研究发现，由于Ho3+和Tm3+离子之间的交叉弛豫：3H4(Tm3+)+5I6(Ho3+)→3F4(Tm3+)+5F5(Ho3+)，以及3F4(Tm3+)+5I8(Ho3+)→3H6(Tm3+)+5I7(Ho3+)，Yb3+/Ho3+/Tm3+共掺杂样品中红色与绿色的积分发射强度比(3.95)大于Yb3+/Ho3+共掺杂样品中的(1.69)。当泵浦功率密度为8.2W·cm-2时，Yb3+/Ho3+/Tm3+共掺杂样品的计算色坐标为x = 0.345，y = 0.338，非常接近等能白光(x = 0.333，y = 0.333)。