A novel yellow phosphor for white light emitting diodes |
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| Authors: | Wang Zhi-Jun Li Pan-Lai Yang Zhi-Ping Guo Qing-Lin Li Xu |
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| Affiliation: | College of Physics Science & Technology, Hebei University, Baoding 071002, China |
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| Abstract: | This paper reports that a novel yellow phosphor, LiSrBO3:Eusup>2+, wassynthesized by the solid-state reaction. The excitation and emissionspectra indicate that this phosphor can be effectively excited byultraviolet (360 and 400~nm) and blue (425 and 460~nm) light, andexhibits a satisfactory yellow performance (565~nm). The role ofconcentration of Eusup>2+ on the emission intensity inLiSrBO3 is studied, and it is found that the criticalconcentration is 3 mol%, and the concentration self-quenchingmechanism is the dipole--dipole interaction according to the Dexter theory.White light emitting diodes were generated by using an InGaN chip(460~nm or 400~nm) with LiSrBO3:Eusup>2+ phosphor, the CIEchromaticity is (x=0.341, y=0.321) and (x=0.324, y=0.318),respectively. Therefore, LiSrBO3:Eusup>2+ is a promisingyellow phosphor for white light emitting diodes. |
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| Keywords: | luminescence white light emitting diodes LiSrBO3:Eusup>2+ |
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