摘要
研究了Yb:YAG晶体的合作发光现象。当用940nm的近红外光激发时,Yb:YAG晶体有明显的上转换蓝色发光。实验发现498nm的蓝色发光强度与激发功率的平方成正比,而且Yb3+掺杂浓度越高,蓝色发光越强。分析表明这是Yb3+间强的相互作用导致的合作发光,是由于Yb3+在共价性的YAG基质中,它的4f13电子易于与近邻离子发生相互作用导致的。
Cooperative luminescence phenomenon of Yb： YAG crystals was studied. Up-converted blue luminescence was obviously observed in Yb： YAG under excitation in the near-infrared region with a wavelength 940 nm. Experimental evidence was provided by the fact that the intensity of 498 nm luminescence shows a quadratic dependence on excitation power, and the intensity of blue luminescence increased with the increase in Yb ion concentration. It is concluded that this luminescence is due to a cooperative process resulting from a strong interaction of Yb ions. The cooperative luminescence is possiblely assigned to the strong interaction of 4f^13 electrons and neighboring Yb^3＋ ions in a covalent host lattice such as YAG. Theoretical cooperative luminescence spectrum was calculated.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2005年第8期1199-1202,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金(60177003)资助项目
关键词
合作发光
YB:YAG晶体
上转换发光
Cooperative luminescence
Yb： YAG crystals
Up-converted luminescence
