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Down-Conversion From Blue to Near Infrared in Tm ^{3+} –Yb ^{3+} Codoped Y _{2} O _{3} Transparent Ceramics

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7 Author(s)
Lin, Hui ; Key Lab. of Mater. for High Power Laser, Chinese Acad. of Sci., Shanghai, China ; Zhou, Shengming ; Hou, Xiaorui ; Li, Wenjie
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Down-conversion from blue to near infrared (NIR) has been demonstrated in Tm3+-Yb3+ codoped Y2O3 transparent ceramics. Upon the 464-nm excitation, the energy transfer (ET) mechanisms consisted of the Tm3+ : 1G4 → 2Yb3+ : 2F5/2 cooperative down-conversion and the phonon assisted Tm3+ : 1G4 + Yb3+ : 2F7/2 → Tm3+ : 3H5 + Yb3+ : 2F5/2 cross relaxation. The low quantum yield of the latter process, together with the low absorption cross section of Tm3+ at 464 nm and the low quenching concentration of Yb3+ in the Y2O3 host, made the Yb3+ 1030-nm NIR emission too weak for practical application.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 12 )