Abstract：BaIn6Y2O13 phosphors with different doping concentrations of Yb3+ and Er3+ were prepared via the high temperature solid-state reaction method. XRD data showed that BaIn6Y2O13 phosphors belong to hexagonal system and the introduction of doping agent Yb3+ and Er3+ did not change the lattice structure of the host. The upconversion emission spectrum and power were measured by 971 nm LD laser with different excitation powers and the energy efficiencies of the samples were calculated. The obtained data showed that the ratio of green power to red power kept decreasing with the increase in doping agent concentration when the excitation density remains constant, increasing with the increase in the excitation density at the same concentration of doping agent. The analyses revealed that the former was attributed to the increasing cross relaxation between Er3+ ions, while the latter came from the raise of the energy transfer between Yb3+ and Er3+ ions and the excited state absorption of Er3+ ions due to the higher excitation density. With the increase in the excitation density, at the beginning the green luminescence power was proportional to the square of the excitation power, which agrees with the reported result. The maximum values of the fluorescence efficiencies of the samples were obtained as 0.38% (the doping concentrations of Yb3+ and Er3+ are 3%, 1%)and 0.06%(the doping concentrations of Yb3+ and Er3+ are 9%, 3%). It can be attributed to the long lifetime of 4I13/2 energy level so it can gather a large number of electrons and reduce the population of ground state, resulting in lower pump efficiency.
[1] Auzel F. Comptes Rendus，1966，263B：819. [2] Pollnau M, Gamelin D R, Luthi S R, et al. Phys. Rev. B, 2000, 61(5): 3337. [3] Wang Feng, Deng Renren, Wang Juan, et al. Nat. Mater., 2011, 10: 968. [4] Yang Jun, Zhang Cuimiao, Peng Chong, et al. Chem. Eur. J., 2009, 15(18): 4649. [5] Marcin N, Rajiv K, Tymish Y O, et al. Nano Letters, 2008, 8(11): 3834. [6] Wang Feng, Debapriya Banerjee, Liu Yongsheng, et al. Analyst, 2010, 135(8): 1839. [7] Yang Zhongmin, Jiang Zhonghong. J. Non-Cryst. Solids, 2005, 351(30-32): 2576. [8] Yu Zhizhou, Yang Qibin, Xu Changfu, et al. Mater. Res. Bull., 2009, 44(7): 1576. [9] Strumpel C, McCann M, Beaucarne G, et al. Sol. Energy Mater. Sol. Cells, 2007, 91(4): 238. [10] Richards B S, Shalav A. IEEE Trans. Electron Devices, 2007, 54(10): 2679. [11] Shalav A, Richards B S, Green M A. Sol. Energy Mater. Sol. Cells, 2007, 91(9): 829. [12] YANG Jian-hu, DAI Shi-xun, JIANG Zhong-hong(杨建虎, 戴世勋, 姜中宏). Progress in Physics(物理学进展), 2003, 23(3): 284. [13] Amitava P R, Christopher S F, Rakesh K, et al. Applied Physics Letters, 2003, 83(2): 285. [14] Passuello T, Piccinelli F, Pedroni M, et al. Opt. Mater., 2011, 33(10): 1500. [15] Ma Mo, Yang Liwen, Ren Guozhong, et al. J. Lumin., 2011, 131(7): 1482. [16] Zhang Cuimiao, Ma Pingan, Li Chunxia, et al. J. Mater. Chem., 2011, 21: 717. [17] Qin Weiping, Cao Chunyan, Wang Lili, et al. Opt. Lett., 2008, 33(19): 2167. [18] Li A H, Lü Q. Europhysics Letters, 2011, 96: 18001. [19] Lecuna R C, Podriguez M R, Valiente R, et al. Chem. Mater., 2011, 23(15): 3442. [20] Etchart I, Huignard A, Berard M, et al. J. Mater. Chem., 2010, 20(19): 3989. [21] Liu Xiaoming, Lin Cuikun, Lin Jun. Applied Physics Letters, 2007, 90(8): 081904. [22] Fonger W H, Struck C W. Phys. Rev. B, 1978, 17: 241. [23] XU Xu-rong, SU Mian-zeng(徐叙瑢, 苏勉曾). Science of Luminescence and Luminescent Material(发光学与发光材料). Beijing: Chemical Industry Press, 2004. [24] Xu Shiqing, Yang Zhongmin, Dai Shixun, et al. J. Alloys Comp., 2003, 361(1-2): 313.
