MAO Yan-li1，DING Fei1，WANG Chang-shun1，DENG Pei-zhen2，GAN Fu-xi2
1.College of Physics and Information Optoelectronics, Henan University, Kaifeng 475001, China 2.Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract：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 4f13 electrons and neighboring Yb3+ ions in a covalent host lattice such as YAG.Theoretical cooperative luminescence spectrum was calculated.
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