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アァカサザタダナハバパマヤャラワヮンイィキギシジチヂニヒビピミリウゥクグスズツヅッヌフブプムユュルエェケゲセゼテデヘベペメレオォコゴソゾトドノホボポモヨョロヲ ―

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á à Á À é è É È ç Ç ê

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1
Color Centers and Charge Transfer Luminescence in a Yb3+-Doped PbWO4 Single Crystal

황옌린,kiwan Jang,Hyo Jin Seo,Lianze Zhao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
Optical absorption and induced color centers are discussed on the base of irradiation and annealing treatment in Yb3+ -doped lead-tungstate crystals. The photoluminescence spectra (under UV excitation), the X-ray excited luminescence, and the IR fluorescence (under LD 940-nm infrared excitation) of Yb3+ ions in the PbWO4 crystal was studied at room temperature. irradiation with a dose of 105 Gy and subsequent annealing in air could lead to a valence change of the Yb3+ ions and evolvement of color centers in the crystal. Based on the irradiation-induced absorption spectra and annealing, F and F+ centers perturbed by Yb3+ ions are proposed and could be responsible for shaping the absorption and emission spectra of Yb3+ ions in PbWO4 crystals. X-ray excited luminescence measurements were also performed and showed a charge transfer luminescence in heavily doped PWO4 : Yb3+ (2.0 mol%). Annealing treatments in air exerted a distinct influence on the intrinsic luminescence in PbWO4, the IR emission, and the lifetime of Yb3+ ions, but did not show an influence on the charge transfer luminescence. Contrarily, -irradiation only shows an influence on the charge transfer luminescence of Yb3+ ions, and has no obvious effect on the intrinsic luminescence of PbWO4.