Upconversion phenomena in the Yb3+ doped transition metal compounds Rb2MnCl4 and CsMnBr3

被引：25
|
作者：
Reinhard, C [1 ]
Gerner, P [1 ]
Valiente, R [1 ]
Wenger, OS [1 ]
Güdel, HU [1 ]
机构：
[1] Univ Bern, Dept Chem & Biochem, CH-3000 Bern 9, Switzerland
来源：
JOURNAL OF LUMINESCENCE | 2001年 / 94卷
关键词：
upconversion; exchange interaction;
D O I：
10.1016/S0022-2313(01)00296-4
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Crystals of Yb3+ doped Rb-2 MnCl4 and CsMnBr3 show orange-red Mn2+ T-4(1g) --> (6)A(1g) upconverted luminescence under near-infrared Yb3+ excitation. By short 10 ns pulse excitations the upconversion (UC) process for both compounds has been determined to consist of a sequence of ground and excited-state absorption steps. This mechanism can gain nonzero probability by assuming an exchange mechanism between Yb3+ and Mn2+. The efficiency of the UC process is dependent on the structural nature of the Yb3+-Mn2+ connection. It is three orders of magnitude more efficient in Rb2MnCl4: Yb3+ with a corner-sharing Yb3+-Cl-Mn2+ arrangement than in the face-sharing Yb3+-Br-3-Mn2+ arrangement of CsMnBr3 : Yb3+. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：331 / 335
页数：5
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