[1] Vergeer P, Vlugt T J H, Kox M H F, et al. Phys. Rev. B, 2005, 71(1): 014119.

[3] Wegh R T, Donker H, Oskam K D, et al. Science, 1999, 283(54 02): 663.

[4] Richards B S. Sol. Energy Mater. Sol. Cells, 2006, 90(9): 1189.

[5] Zhu W J, Chen D Q, Lei L, et al. Nanoscale, 2014, 6(18): 10500.

[6] Chen D Q, Wang Y S, Hong M C. Nano Energy, 2012, 1(1): 73.

[7] Zhou J J, Teng Y, Liu X F, et al. Phys. Chem. Chem. Phys., 2010, 12(41): 13759.

[8] Chen X B, Salamo G J, Yang G J, et al. Opt. Express, 2013, 21(18): A829.

[10] Trupke T, Green M A, Wurfel P. J. Appl. Phys., 2002, 92(3): 1668.

[11] Zhou J J, Teng Y, Zhou S F, et al. International Journal of Applied Glass Science, 2012, 3(4): 299.

[12] Zhou J J, Teng Y, Liu X F, et al. Opt. Express, 2010, 18(21): 21663.

[13] Reisfeld R. Lasers and Excited States of Rare-Earth (Springer-Verlag), 1977.

[14] Wang Y Z, Yu D C, Lin H H, et al. J. Appl. Phys., 2013, 114(20): 203510.

[15] van der Ende B M, Aarts L, Meijerink A. Phys. Chem. Chem. Phys., 2009, 11(47): 11081.