Structural and luminescent properties of red-emitting SrGe4O9: Mn4+ phosphors for white light-emitting diodes with high color rendering index
- Authors
- Kim, Seung Jun; Jang, Ho Seong; Unithrattil, Sanjith; Kim, Yoon Hwa; Im, Won Bin
- Issue Date
- Apr-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- LED phosphor; Red phosphor; Rietveld refinement; Solid-state lighting
- Citation
- JOURNAL OF LUMINESCENCE, v.172, pp.99 - 104
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF LUMINESCENCE
- Volume
- 172
- Start Page
- 99
- End Page
- 104
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/23182
- DOI
- 10.1016/j.jlumin.2015.11.042
- ISSN
- 0022-2313
- 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 2380 cm−1 and Racah parameters, B and C of 1970 and 860 cm−1, respectively. Due to the 4A2g→4T1g and 4A2g→2T2g 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 655 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.
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