Degradation of phosphors under cathode-ray excitation |
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| Institution: | 1. R&D Division, Daihatsu Motor Co., Ltd., 3000 Yamanoue, Ryuo, Gamo, Shiga 520-2593, Japan;2. Cataler Corporation, 7800 Chihama, Kakegawa, Shizuoka 437-1492, Japan;3. Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87106, USA;4. Department of Nanotechnology for Sustainable Energy, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan;1. Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA;2. Maryland Energy Innovation Institute, University of Maryland, College Park, MD 20742, USA |
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| Abstract: | A systematic analysis of phosphor degradation is presented. An increase of the self-absorption of the luminescence, destruction of luminescence centres, a decreased energy flow to these centres, and increased energy losses in the phosphor host lattice - both in the bulk and at the surface - can be distinguished as causes of the deterioration of the external radiant efficiency of phosphors. Simple measurements are suggested to disentangle the contribution of each of these parameters to the observed degradation effects. As an illustration degradation effects of Zn2SiO4 : Mn, Y2SiO5 : Ce, Sr2Al6O11 : Eu and a Tb3+ activated borate glass are analyzed. |
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