Preparation and Size-dependent Upconversion Luminescence Mechanism of Y2O2S: Yb, Ho Nanoparticles

被引：0
|
作者：
Xing Ming-Ming [1 ]
Cao Wang-He [1 ]
Feng Wei [1 ]
Pang Tao [1 ]
Ling Xiao-Qiao [1 ]
机构：
[1] Dalian Maritime Univ, Optoelect Technol Inst, Dalian 116026, Peoples R China
来源：
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE | 2009年 / 30卷 / 09期
关键词：
Upconversion; Luminescence mechanism; Y2O2S:; Yb; Ho; PARTICLES; EMISSION; LANTHANIDE; YTTERBIUM; HOLMIUM; ION; ER;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of Y2O2S: Yb, Ho upconversion particles were prepared using an improved homogeneous precipitation method combined with a solid-gas sulfuration technology. The structure and morphology of particles were characterized by X-ray diffraction (XRD) and transmission electron microscope(TEM), and the upconversion luminescence (UCL) properties and mechanisms were studied by UCL spectra and FT-infrared spectra (FTIR). The results of XRD indicated that the prepared samples were pure hexagonal structure. TEM images showed the prepared particles were mono-dispersed with regular sphere shape and exhibited the narrow size distribution with average size of 40, 80 and 200 rim, respectively. According to the In-In plots of emission intensity as a function of excitation power, it was found that the blue emissions varied from three-photon absorption process to two-photon absorption process with decreasing particle size. For the green and red emissions, only the two-photon absorption process was observed, but the slope values of the lnI(P)-lnI(UCL) plot increased with decreasing particle size. The mechanism of the effects of particle size on the UCL properties was discussed.
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页码：1696 / 1702
页数：7
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