X-Ray Excited Luminescence Property of ZnS∶Au, Cu Fine Particles Synthesized by Hydrothermal Method
XIN Mei1, 2, CAO Wang-he1
1. Optoelectronic Technology Institute, Dalian Maritime University, Dalian 116026, China 2. Department of Physics, College of Science, Dalian Nationalities University, Dalian 116605, China
Abstract：Highly luminescent ZnS∶Au, Cu X-ray phosphor fine particles synthesized by hydrothermal method is reported for the first time and its photoluminescence (PL) and X-ray excited luminescence (XEL) properties were studied in detail. With direct hydrothermal treatment at 200 ℃ for 12 h, the average gain size of samples is about 15 nm; the synthesized sphere-like nanocrystals with well dispersity and narrow gain size distribution show cubic structure. After baking in argon at 1 000 ℃ for 1h the sample agglomerate size is about 1-2 μm and the roughly spherical fine particles show pure hexagonal structure. The PL and XEL spectra of all the samples show a broad emission band and an intense emission band in the range of 400-600 nm. The maximum XEL intensity of sample directly synthesized by hydrothermal treatment was observed when Cu/Zn and Cu/Al were 3×10-5 and 2, respectively. In this condition, the strongest PL emission was observed for the direct synthesized sample being further baked in argon at 900 ℃ for 1 h and the PL peak was centered at about 529 nm. The strongest XEL emission was observed for the direct synthesized sample being further baked in argon at 1 000 ℃ for 1h and the XEL peak was centered at about 445 and 513 nm, respectively. In the meantime, the XEL intensity increased about ten times compared with that directly synthesized without baking. The difference between PL and XEL spectra is due to its different excitation mechanism. The luminescence mechanism and different excitation mechanism of PL and XEL were discussed. The red shift of XEL spectrum with directly synthesized sample was observed with increasing the Cu/Zn. The reason can also be explained by the luminescence mechanism and excitation mechanism of XEL.
[1] Moharil S V. Bull. Mater. Sci., 1994, 17(1): 25. [2] Brixner L H. Mater. Chem. Phys., 1987, 16: 253. [3] Issler S L, Torardi C C. J. Alloys & Comp., 1995, 229: 54. [4] Morlotti R, Nikl M, Piazza M, et al. J. Lumin., 1997, 72-74: 772. [5] Tian Ying, Cao Wanghe, Luo Xixian, et al. J. Alloys & Comp., 2007, 433: 313. [6] Kandarakis I, Cavouras D, Panayiotakis G S, et al. Phys. Med. Biol., 1997, 42: 1351. [7] Kandarakis I, Cavouras D, Nomicos C D, et al. Nuclear Instrument and Methods in Physics Research B., 2001, 179: 215. [8] Kandarakis I, Cavouras D, Nikolopoulos D, et al. Radiation Measurements., 2005, 39(3): 263. [9] Bang Jungsik, Abboudi Mostafa. J. Lumin., 2004, 106: 177. [10] Ravichandran D, Roy R, White B W. J. Soc. Inf. Display., 1997, 5(2): 107. [11] Ihara M, Igarashi T, Kusunoki T, et al. J. Electrochem. Soc., 2002, 149(3): H72. [12] WANG Dan-jun, GUO Li, LI Dong-sheng, et al(王丹军, 郭 莉, 李东升, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2008, 28(4): 788. [13] ZHAI Yong-qing, YANG Guo-zhong, LIU Yu, et al(翟永清, 杨国忠, 刘 宇, 等). Spectroscopy and Spectral Analys(光谱学与光谱分析)，2008，28(3):522. [14] SANG Wen-bin, QIAN Yong-biao, MIN Jia-hua, et al. Solid State Comm., 2002, 121: 475. [15] Chander Harish, Shanker V, Haranath D, et al. Mater. Res. Bull., 2003, 38: 279. [16] LUO Xi-xian, CAO Wang-he, ZHOU Li-xin. J. Lumin., 2007, 122-123: 812. [17] YUE G H, YAN P X, AN D Y, et al. Appl. Phys., 2006, A84: 409. [18] QIANYi-tai, SU Yi, XIE Yi, et al. J. Sphalerite Synthesis., 1995, 30(5): 601. [19] So Won-Wook, Jang Jum-Suk, Rhee Young-Woo, et al. J. Coll. Interf. Sci., 2001, 237: 136. [20] Yang Chung-Sung, Awschalom David. D, Stucky Galen. D. J. Chem. Mater., 2001, 13: 594.
