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Effects of Mo on phase structure and up-conversion emissions of Er:Al2O3 nanocrystals

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Abstract

A simple and efficient approach was presented to enhance up-conversion emissions significantly for the Er:Al2O3 nanocrystals by Mo support (Er-Mo:Al2O3) with a 976 nm laser diode excitation. Mo support had evident effects on the phase structure and up-conversion emissions for the Er:Al2O3 nanocrystals, which promoted the θ-(Al,Er)2O3 transformed to α-(Al,Er,Mo)2O3 phase. Compared with the Er:Al2O3, the maximal green and red up-conversion emissions intensities increased about 3×103 and 1.4×102 times for the Er-Mo:Al2O3 nanocrystals, respectively. It suggests that the enhancement of up-conversion emissions is caused by the high excited state energy transfer process from |4I15/2, 3T2> state of the Er3+-MoO4 2− dimer to the 4F7/2 level of Er3+.

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Authors and Affiliations

  1. School of Physics and Materials Engineering, Dalian Nationalities University, Dalian, 116600, China

    Dan Liu & Yan Cong

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  1. Dan Liu
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  2. Yan Cong
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Correspondence to Yan Cong.

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Liu, D., Cong, Y. Effects of Mo on phase structure and up-conversion emissions of Er:Al2O3 nanocrystals. Sci. China Phys. Mech. Astron. 55, 1417–1421 (2012). https://doi.org/10.1007/s11433-012-4813-7

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