Fluorescence properties of divalent and trivalent europium ions in CdWO4 single crystals grown by the Bridgman method |
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| Authors: | Hu Hao-Yang a Xia Hai-Ping a Hu Jian-Xu a Zhang Yue-Pin a Jiang Hao-Chuan b and Chen Hong-Bing |
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| Affiliation: | c) a)Key Laboratory of Photo-electronic Materials,Ningbo University,Ningbo 315211,China b)Ningbo Institute of Materials Technology and Engineering,the Chinese Academy of Sciences,Ningbo 315211,China c)Faculty of Material Science and Chemical Engineering,Ningbo University,Ningbo 315211,China |
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| Abstract: | Optical absorption,excitation,and fluorescence were investigated in Eu ion-doped CdWO4 single crystal grown by a modified Bridgman method.The results indicate that Eu2+ and Eu3+ ions coexist in CdWO4 crystal and an energy transfer occurs between these Eu2+ and Eu3+ ions.When the crystal is excited by 266-nm light,the energy corresponding to the 4f65d to 8S7/2 transition of Eu2+ ions results in the excitation of the Eu3+ ions to the 5DJ level.The effect on fluorescence of annealing in oxygen at various temperatures was investigated.The excitation intensity of Eu2+ ions at 266 nm decreases as annealing temperature increases from 300 K to 1073 K,but it remains at a certain equilibrium level when the annealing temperature is further increased. |
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| Keywords: | Eu^2＋ ion optical spectra cadmium tungstate Bridgman method |
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