[1] Poirier G, Cassanjes F C, de Araujo C B, et al. J. Appl. Phys., 2003, 93(6): 3259.
[2] Rakov N, Maciel G S, Sundheimer M L, et al. J. Appl. Phys., 2002, 92(10): 6337.
[3] Ozen G, Kermaoui A, et al. J. Lumi., 1995, 63: 85.
[4] Vladimir A, Jerez, de Araujo C B. J. Appl. Phys., 2004, 96: 2530.
[6] Zheng Hairong, Gao Dangli, Zhang Xiangyu, et al. J. Appl. Phys., 2008, 104: 013506.
[7] Meltze R S. Phys. Rev. B, 1999, 15(2): 12.
[8] Henderson B, Imbusch G F. Optical Spectroscopy of Inorganic Solids. Oxford: Clarendon Press, 1989: 173.
[9] Mitto Inoluti and Fumio Hirayama. J. Chem. Phys., 1965, 43: 1978.
[10] Zheng H R, Wang X J, Qu S X, et al. J. Lumi., 2006, 119: 153.
[11] Zheng Hairong, Wang Xiao-jun, Dejneka M J, et al. J. Lumi., 2004, 108: 395.
[12] Tick P A, Borreli N F, Reaney I M. Opt. Mater., 2000, 15(1): 81.
[13] Kumar K U, Prathyusha V A, Babu P, et al. Spectrochimical Act Part A, 2007, 67: 702.
