[1] [1] T. Sandrock, H. Scheife, E. Heumann. High-power continuous-wave upconversion fiber laser at room temperature［J］. J. Opt. Lett., 1997, 22(11): 808～810

[2] [2] Zhao Yuxing. An analytical model for Pr3+-doped fluoride fiber upconversion lasers［J］. Opt. Commun., 1997, 134(1～6): 470～478

[3] [3] Fang Aiping, Dai Zhenwen, Yang Haigui et al.. Theoretical study of 4f～5d upconversion excitation in Yb3+/Pr3+ZBLAN Fiber［J］. Chinese J. Luminescence, 2004, 25(5): 487～494

[4] [4] Jiang Shibin, Luo Tao, Hwang Bor-Chyuan et al.. Er3+-doped phosphate glasses for fiber amplifiers with high vain per unit length［J］. Non-Cryst Solids, 2000, 263&264: 364～368

[5] [5] Meng Qingyu, Chen Baojiu, Zhao Xiaoxia. Study on UV excitation spectra of Eu3+ or Tb3+ doped Y2O3 nanomaterials［J］. Chinese J. Luminescence, 2008, 29(1): 107～113

[6] [6] Ren Qi, Dai Rucheng, Shen Yuhua et al.. Color design based on upconversion luminescence of NaYF4Yb3+/Er3+［J］. Chinese J. Luminescence, 2010, 31(1): 69～73

[7] [7] Zeng Jinghui, Xie Ting, Li Zhihua et al.. Mono-dispersed nano-crystalline fluoroperovskite up-conversion phosphors［J］. Crystal Growth & Design, 2007, 7(12): 2775～2777

[8] [8] R. Naccache, F. Vetrone, V. Mahalingam et al.. Controlled synthesis and water dispersibility of hexagonal phase NaGdF4Ho3+/Yb3+ nanoparticles［J］. Chem Mater., 2009, 21(4): 717～723

[9] [9] Chen Xun, Wang Wanjun, Chen Xueyuan et al.. Microwave hydrothermal synthesis and upconversion properties of NaYF4Yb3+/Tm3+ with microtube morphology［J］. Materials Letters, 2009, 63(12): 1023～1026

[10] [10] F. Vetrone, R. Naccache, V. Mahalingam et al.. The active-core/active-shell approach: a strategy to enhance the upconversion luminescence in lanthanide-doped nanoparticles［J］. Adv. Funct. Mater., 2009, 19(22): 2924～2927

[11] [11] Li Chunxia, Yang Jun, Yang Piaoping et al.. Hydrothermal synthesis of lanthanide fluorides LnF3 (Ln=La to Lu) nano-/microcrystals with multiform structures and morphologies［J］. Chem. Mater., 2008, 20(13): 4317～4326

[12] [12] L. F. Johnson, H. J. Guggenheim, T. C. Rich et al.. Infrared to visible conversion by rare earth ions in crystals［J］. J. Appl. Phys., 1972, 43(3): 1125～1137

[13] [13] F. Vetrone, V. Mahalingam, J. A. Capobianco. NIR to blue upconversion emission from BaYF5: nanocrystals［J］. Chem. Mater., 2009, 21(19): 1847～1856

[14] [14] X. P. Chen, Q. Y. Zhang, C. H. Yang et al.. Comparative investigation on structure and luminescence properties of fluoride phosphors codoped with Er3+/Yb3+［J］. J. Spectrochimica Acta Part A, 2009, 74: 441～445

[15] [15] J. W. Touwdam, F. J. Mvan. Near-infrared emission of redispersible Er3+, Nd3+ and Ho3+ doped LaF3 nanoparticles［J］. Nano Lett., 2002, 2(11): 733～737

[16] [16] H. Guo, Y. M. Qiao. Preparation, characterization, and strong upconversion of monodisperse Y2O3Er3+/Yb3+ microspheres［J］. Opt. Mater., 2009, 31(4): 583～589

[17] [17] M. M. Hawkeye, M. J. Brett. Relationship between optical properties and crystallinity of nanometer Y2O3Eu phosphor［J］. Appl. Phys. Lett., 2000, 76(4): 1549

[18] [18] F. Vetrone, J. C. Boyer, J. A. Capobianco et al.. Upconversion in nanocrystalline and bulk Y2O3Er3+［J］. Chem. Mater., 2003, 15(25): 2737～2743

[19] [19] J. A. Capobianco, F. Vetrone, J. C. Boyer et al.. Enhancement of red emission via upconversion in bulk and nanocrystalline cubic Y2O3Er3+［J］. J. Phys. Chem. B, 2002, 106(12): 1181～1187