Upconversion excitation of Cr3+2E emission in Y3Ga5O12 codoped with Cr3+ and Yb3+
2001; Elsevier BV; Volume: 334; Issue: 4-6 Linguagem: Inglês
10.1016/s0009-2614(00)01444-5
ISSN1873-4448
AutoresStephan Heer, Markus Wermuth, Karl W. Krämer, Hans U. Güdel,
Tópico(s)Glass properties and applications
ResumoThe 2E→4A2 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 2F5/2 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 2F5/2 excitation to Cr3+.
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