摘要
以柠檬酸为燃烧剂,掺杂摩尔分数为2%的Ho3+,采用低温燃烧法制备Ho∶YbGG多晶粉体。通过对样品的X射线衍射和扫描电镜分析,确定最佳煅烧温度为900℃。样品的吸收光谱在536 nm和645 nm处出现较强吸收峰,分别对应Ho3+的5I8→5F4(5S2)和5I8→5F5能级跃迁;在940 nm和982 nm处出现强吸收谱带,对应于Yb3+的2F7/2→2F5/2能级跃迁。样品的荧光光谱在1 989 nm处有强发射谱带,对应于Ho3+的5I7→5I8能级跃迁。样品可以发出较强的上转换绿光和红光,分别对应于Ho3+的5F4(5S2)→5I8和5F5→5I8能级跃迁。对相应的上转换机制也进行了分析。
Holmium doped ytterbium gallium garnet ( Ho∶ YbGG) polycrystal powder was synthe-sized by low temperature combustion method using citric acid as combustion agent. The mole fraction of Ho3 + was 2% . The Ho∶ YbGG polycrystal powder was determined by X-ray diffraction analysis and SEM analysis. The results show that 900 ℃ is the optimum calcination temperature. The ab-sorption spectrum of the sample shows that the absorption peaks of Ho3 + are centered at 536 nm and 645 nm, corresponding to 5 I8 →5 F4 ( 5 S2 ) and 5 I8 →5 F5 level transitions, respectively. The strong absorption bands of Ho3 + are centered at 940 nm and 982 nm, corresponding to 2 F5 / 2 →2 F7 / 2 level transition. The fluorescence spectra of the samples show that the strong emission band of Ho3 + is centered at 1 989 nm, corresponding to 5 I7→5 I8 level transition. The upconversion spectrum of the sample was tested and the corresponding conversion mechanism was analyzed. Ho∶ YbGG can emit strong green and red light under 980 nm LD excitation, which are corresponding to 5 F4 ( 5 S2 )→5 I8 and 5 F5→5 I8 level transitions of Ho3 + .
出处
《发光学报》
EI
CAS
CSCD
北大核心
2014年第9期1065-1070,共6页
Chinese Journal of Luminescence
基金
吉林省科技发展计划(20090526)资助项目
关键词
钬掺杂镱镓石榴石多晶粉体
低温燃烧法
吸收光谱
上转换光谱
holmium doped ytterbium gallium garnet polycrystal powder
low temperature combustion method
absorption spectrum
upconversion fluorescence spectrum
