Abstract:Broadband IR-to-visible upconversion material CaS∶Ce, Sm was synthesized for the first time by the low-temperature combustion synthesis (LCS) method. The effect of the rare earth dopant concentration on the upconversion properties was studied. XRD analysis shows that the sample features the cubic CaS crystal structure. The excitation spectrum of the sample is in the range of 200-500 nm, i.e. ultraviolet light or the visible light can excite the sample effectively to complete the “charged” process, and the excitation effect of the visible light is dominant. The IR sensitivity spectrum of the sample is in the range of 800-1 400 nm, indicating that CaS∶Ce, Sm possesses the broadband IR-to-visible upconversion effect. The IR-to-visible upconversion spectrum of the sample is a broadband spectrum in the range of 450-650 nm, with two adjacent emission peaks at 513.4 and 572 nm, resulting from the transitions of Ce3+ 2T2g(5d)→2F5/2(4f) and the transitions of Ce3+2T2g(5d)→2F7/2(4f), respectively.
[1] Oelckers S, Gurzadyan G G, Roeder B. Infrared Physics & Technology, 1998, 39: 425. [2] ZHANG Xi-yan, LIU Quan-sheng, WANG Xiao-chun, et al(张希艳, 刘全生, 王晓春, 等). Chinese J. Infrared Millimeter Waves(红外与毫米波学报), 2005, 24(4): 301. [3] ZHANG Lin, WANG Yong-sheng, SUN Li, et al(张 琳,王永生,孙 力,等). Journal of the Chinese Rare Earth Society(中国稀土学报),2004,22(2):284. [4] Wu J, Newman D, Viney I V F. Journal of Physics D: Applied Physics, 2002, 35(10): 968. [5] He Zhi-yi, Wang Yong-sheng, Sun Li, et al. J. Phys.: Condens. Matter, 2001, 13: 3665. [6] Newman D M, Wu J P, Viney I V. Transactions of the Magnetics Society of Japan, 2002, 2(4): 220. [7] Vasyl G K. Optical Materias, 2001, 16(3): 3402. [8] ZHANG Mai-sheng, LI Jun-jun, YAN Chun-hua(张迈生,李君君,严纯华). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2001, 21(3): 304. [9] Mimani T. J. Alloy Comp., 2001, 315(1/2): 12. [10] YAO Wei-hua, ZHANG Zhong-tai, TANG Zi-long, et al(尧巍华, 张中太, 唐子龙, 等). Rare Metal Materials and Engineering(稀有金属材料与工程), 2004, 33(4): 421. [11] Piol S, Najib M, Bastidas D M, et al. J. Solid State Electrochem., 2004, 8: 650. [12] Kanehisa O, Yamamoto H, Okamura T, et al. J. Electrochem. Soc., 1994, 141(11): 3188. [13] CHEN Shu-chun, DAI Feng-mei(陈述春, 戴凤妹). Acta Optica Sinica(光学学报), 1995, 15(6): 749.