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 and 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+, was
synthesized by the solid-state reaction. The excitation and emission
spectra indicate that this phosphor can be effectively excited by
ultraviolet (360 and 400~nm) and blue (425 and 460~nm) light, and
exhibits a satisfactory yellow performance (565~nm). The role of
concentration of Eusup>2+ on the emission intensity in
LiSrBO3 is studied, and it is found that the critical
concentration is 3 mol\%, and the concentration self-quenching
mechanism 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 CIE
chromaticity is (x=0.341, y=0.321) and (x=0.324, y=0.318),
respectively. Therefore, LiSrBO3:Eusup>2+ is a promising
yellow phosphor for white light emitting diodes. |
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| Keywords: | luminescence white light emitting diodes LiSrBO3:Eusup>2+ |
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