Up-conversion excitation of sharp Cr3+ 2E emission in YGG and YAG codoped with Cr3+ and Yb3+

被引：53

作者：

Heer, S

Wermuth, M

Krämer, K

Ehrentraut, D

Güdel, HU

机构：

[1] Univ Bern, Dept Chem & Biochem, CH-3000 Bern 9, Switzerland

[2] Swiss Fed Inst Technol, Dept Microtech, Inst Appl Opt, CH-1012 Lausanne, Switzerland

来源：

JOURNAL OF LUMINESCENCE | 2001年 / 94卷

关键词：

upconversion; two photon process;

D O I：

10.1016/S0022-2313(01)00395-7

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The E-2 --> (4)A(2) emission of Cr3+ in crystals and glasses is of great importance in science and technology. We found a new excitation mode for this emission in the garnets YGG and YAG codoped with Cr3+ and Yb3+. It is based on an up-conversion mechanism using F-2(5/2) of Yb3+ as an intermediate state. Excitation of the Yb3+ in the near infrared around 1000 nm leads to visible Cr3+ 2E --> (4)A(2) emission around 700 nm at low temperatures. The up-conversion luminescence intensity shows a strong temperature dependence due to an intrinsic loss mechanism. The up-conversion excitation spectra follow the Yb3+ F-2(7/2) --> F-2(5/2) absorptions. From its time dependence the up-conversion mechanism is found to be dominated by an energy transfer step: Two excited Yb3+ ions simultaneously transfer their F-2(5/2) excitation to Cr3+. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：337 / 341

页数：5

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