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Insights into the energy transfer mechanism in Ce3+-Yb3+ codoped YAG phosphors

By D. C. Yu, F. T. Rabouw, W. Q. Boon, T. Kieboom, S. Ye, Q. Y. Zhang and A. Meijerink


Two distinct energy transfer (ET) mechanisms have been proposed for the conversion of blue to near-infrared (NIR) photons in YAG:Ce3+,Yb3+. The first mechanism involves downconversion by cooperative energy transfer, which would yield two NIR photons for each blue photon excitation. The second mechanism of single-step energy transfer yields only a single NIR photon for each blue photon excitation and has been argued to proceed via a Ce4+-Yb2+ charge transfer state (CTS). If the first mechanism were operative in YAG:Ce3+,Yb3+, this material would have the potential to greatly increase the response of crystalline Si solar cells to the blue/UV part of the solar spectrum. In this work, however, we demonstrate that blue-to-NIR conversion in YAG:Ce3+,Yb3+ goes via the single-step mechanism of ET via a Ce4+-Yb2+ CTS. The photoluminescence decay dynamics of the Ce3+ excited state are inconsistent with Monte Carlo simulations of the cooperative (one-to-two photon) energy transfer, while they are well reproduced by simulations of single-step (one-to-one photon) energy transfer via a charge transfer state. Based on temperature dependent measurements of energy transfer and luminescence quenching we construct a configuration coordinate model for the Ce3+-to-Yb3+ energy transfer, which includes the Ce4+-Yb2+ charge transfer state

Year: 2014
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