Abstract
Ce3+ doped garnet phosphors are used for white-LED because Ce3+ in a garnet structure A3B2C3O12 has blue absorption and efficient visible luminescence due to the 4f-5d allowed transition. The 5d energy level of Ce3+ is shifted by crystal field splitting and nephelauxetic effect. In garnet hosts, it is known that the degree of crystal field splitting is large and depends on the size and distortion of dodecahedral A site. When A site cation becomes larger, the crystal field splitting becomes larger and the Ce3+ 4f-5d luminescence shifts to longer side [1].
© 2015 Japan Society of Applied Physics, Optical Society of America
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