[1] . Mateos, M. C. Pujol, F. Guell et al.. Infrared-to-green up-conversion in Er3+, Yb3+-doped monoclinic KGd(WO4)2 single crystals[J]. Opt. Matter., 2004, 27(3): 475-479.

[2] Shiqing Xu, Zhongmin Yang, Guonian Wang et al.. Upconversion fluorescence spectroscopy of Er3+-doped lead oxyfluorosilicate glass[J]. Chin. Opt. Lett., 2003, 1(9): 544～546

[3] . New transparent vitro-ceramics codoped with Er3+ and Yb3+ for efficient frequency upconversion[J]. Appl. Phys. Lett., 1993, 63(24): 3268-3270.

[4] Wright J C. Radiationless Processes in Molecules, Condensed Phases[R]. Topics in Applied Physics: Springer, Berlin Heidelberg New York, 1976. 239～244

[5] . L. Sidebottom, M. A. Hruschka, B. G. Potter et al.. Structure and optical properties of rare earth-doped zinc oxyhalide tellurite glasses[J]. J. Non-Cryst Solids, 1997, 222(2): 282-289.

[6] . . Upconversion pumped green lasing in erbium doped fluorozirconate[J]. Electron. Lett., 1991, 27(20): 1785-1786.

[7] Guanshi Qin, Weiping Qin, Changfeng Wu el at.. Intense ultraviolet upconversion luminescence from Yb3+ and Tm3+ codoped amorphous fluoride particles synthesized by pulsed laser ablation[J]. Opt. Commun., 2004, 242(1～3): 215～219

[8] . Sandrock, H. Scheifa, E. Heumann et al.. High-power continuous-wave upconversion fiber laser at room temperature[J]. Opt. Lett., 1997, 22(11): 808-810.

[9] J. S. Sanghera, L. D. Aggarwal. Active and passive chalcogenide glass optical fiber for IR applications: a review[J]. J. Non-Cryst Solids, 1999, 256～257: 6～16

[10] . Rare earth doped ritroceramics: New efficient blue cmd green emitting materials for infared up-conversion[J]. J. Electron. Chem. Soc., 1975, 122(1): 101-107.

[11] Xu Shiqing, Wang Guonian, Yang Zhongmin et al.. Spectra properties and upconversion mechanisms of Er3+-doped heavy metal oxyfluoride germanate glass[J]. Chin. J. Lasers, 2004, 31(10): 1198～1202 (in Chinese)
徐时清,王国年,杨忠明 等. Er3+掺杂重金属氧氟锗酸盐玻璃的光谱性质和上转换机理[J]. 中国激光, 2004, 31(10): 1198～1202

[12] Hongtao Sun, Shiqing Xu, Baoyu Chen et al.. Intense frequency upconversion fluorescence of Er3+/Yb3+ co-doped lithium-strontium-lead-bismuth glasses[J]. Chin. Opt. Lett., 2005, 3(2): 103～106

[13] Zhang Long, Qi Changhong, Lin Fengying et al.. IR emission and frequency upconversion in Tm3+ doped fluoroaluminate glass[J]. Acta Optica Sinica, 2002, 22(2): 233～237
张龙,祁长鸿,林凤英 等. Tm3+离子掺杂氟铝酸盐玻璃红外及上转换光谱性质[J]. 光学学报, 2002, 22(2): 233～237

[14] Daniel R. Gamelin, Hans U. Gudel. Upconversion Processes in Transition Metal and Rare Earth Metal Systems[R]. Topics in Current Chemistry, Springer-Verlag Berlin Heidelberg, 2001, 214: 1～56

[15] . L. Dexter. A theory of sensitized luminescence in solids[J]. J. Chem. Phys., 1953, 21(5): 836-850.

[16] . High-efficiency infrared-to-visible upconversin of Er3+ in BaCl2[J]. J. Appl. Phys., 1993, 74(2): 1272-1278.