Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398625 | Journal of Luminescence | 2016 | 6 Pages |
Abstract
A red-emitting SrGe3.99Mn0.01O9 (SGO:Mn4+) phosphor have been prepared by a solid-state reaction. The structural and optical properties of SGO:Mn4+ phosphors, together with their thermal quenching property have been investigated. The 3d electrons of Mn4+ at octahedral sites of the SGO host showed a crystal field splitting Dq of 2380Â cmâ1 and Racah parameters, B and C of 1970 and 860Â cmâ1, respectively. Due to the 4A2gâ4T1g and 4A2gâ2T2g transitions, broad photoluminescence excitation bands were observed at the spectral region spanning from ultraviolet to blue light. The transition from 2Eg to 4A2g results in a sharp emission peak at 655Â nm. When the yellow-emitting Y3Al5O12:Ce3+ and red-emitting SGO:Mn4+ phosphors were incorporated into a blue light-emitting diode (LED), the fabricated white LED showed an emission in the natural white light region with an excellent color rendering index of 92 and a color stability against an increase in the forward current. Thus, SGO:Mn4+ can be a potential red-emitting phosphor in the fabrication of white LEDs.
Related Topics
Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
Seung Jun Kim, Ho Seong Jang, Sanjith Unithrattil, Yoon Hwa Kim, Won Bin Im,