Upconversion excitation of Cr3+ 2E emission in Y3Ga5O12 codoped with Cr3+ and Yb3+

被引：35

作者：

Heer, S ^{[1
]}

Wermuth, M ^{[1
]}

Krämer, K ^{[1
]}

Güdel, HU ^{[1
]}

机构：

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

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 334卷 / 4-6期

关键词：

D O I：

10.1016/S0009-2614(00)01444-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The E-2 --> (4)A(2) emission of Cr3+ in crystals and glasses is of great importance in science and technology. We report a new excitation mode for this emission in Y3Ga5O12 (YGG) codoped with Cr3+ and Yb3+. It is based on an upconversion mechanism using F-2(5/2) Of Yb3+ as an intermediate state. Excitation in the near-IR at 969.6 nm leads to visible luminescence around 700 nm at low temperature. In YGG:2%Cr3+,1%Yb3+ at 15 K and for a laser power of 150 mW the efficiency of the process is 5.5%. From its time dependence the upconversion 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：293 / 297

页数：5

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