Luminescence of Bi3+-activated LaOBr,a system with emission from different states |
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| Authors: | A Wolfert G Blasse |
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| Institution: | Solid State Department, Physics Laboratory, Utrecht University, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands |
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| Abstract: | The luminescence properties of LaOBr-Bi3+ are reported. Two luminescent centres are observed. These are ascribed to isolated Bi3+ ions and to a second BiOBr-rich phase. The emission of the isolated Bi3+ ion shows a remarkable temperature dependence. At low temperatures the emission is in the UV region. At higher temperatures the UV emission disappears and an emission in the visible region appears. At still higher temperatures the visible emission disappears and the UV emission reappears. The emission in the visible region is ascribed to a charge-transfer transition. |
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