title: [Cooperative luminescence in Yb:YAG crystals].
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 4f(13) electrons and neighboring Yb3+ ions in a covalent host lattice such as YAG. Theoretical cooperative luminescence spectrum was calculated.
authors.affiliation: College of Physics and Information Optoelectronics, Henan University, Kaifeng 475001, China.
authors.forename: Yan-li
authors.initials: YL
authors.lastname: Mao
authors.forename: Fei
authors.initials: F
authors.lastname: Ding
authors.forename: Chang-shun
authors.initials: CS
authors.lastname: Wang
authors.forename: Pei-zhen
authors.initials: PZ
authors.lastname: Deng
authors.forename: Fu-xi
authors.initials: FX
authors.lastname: Gan
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D003460:Crystallization; D004735:Energy Transfer; D004871:Erbium / Q000737:chemistry; D006695:Holmium / Q000737:chemistry; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods; D049329:Nanostructures / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D019265:Spectroscopy, Near-Infrared; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry
chemical_list: D015019:Yttrium; D004871:Erbium; D000537:Aluminum Oxide; D015018:Ytterbium; D006695:Holmium