Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 154, Issue 8, Pages J234-J238Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.2741172
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A new green phosphor, Ce3+-activated CaSc2O4, was developed, which shows green luminescence with a peak wavelength of 515 nm under excitation with blue light. Ce3+-activated CaSc2O4 can be used as a material for color conversion of white-light-emitting diodes (LEDs), which consist of a blue LED, a green phosphor, and a red phosphor, because the luminescence efficiency of this phosphor is comparable to those of commercial phosphors such as Y3Al5O12:Ce3+. The host crystal of this phosphor has an orthorhombic CaFe2O4 structure, and the Ce ion probably exists in an eight-coordinated Ca position. We investigated the dependency of the firing temperature and dopant concentration for luminescence intensity and found that the optimum temperature and concentration were 1600 degrees C and 1 mol % of Ce substituted to the Ca position. The luminescence peak wavelength was shifted toward longer wavelengths by replacing Ca with Mg. In contrast, replacing Ca with Sr resulted in a shift toward shorter wavelengths. (c) 2007 The Electrochemical Society.
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