Abstract
YAlO 3 (YAP) crystals with different Yb 3+ concentration have been grown by Czochralski method and cooperative fluorescence of Yb 3+ ions in YAP crystal was studied under 940-nm infrared (IR) LD excitation at room temperature. The Yb concentration dependence of absorption intensity of IR and charge transfer bands exhibit different features. The green emission band in the region of 480–520 nm was assigned to the cooperative deexcitation of two Yb 3+ ions. The remaining upconverted emission bands containing various sharp peaks associated with impurity ions were observed and discussed. Charge transfer luminescence of heavily doped 20 at% Yb:YAP is strongly temperature dependent and no concentration quenching of the charge transfer luminescence was found through the investigation of different Yb levels samples.
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