Narsarsukite-structure fluorosilicate as a blue component for white LEDs: structural and optical properties
- Authors
- Kim, Yoon Hwa; Im, Won Bin
- Issue Date
- Aug-2014
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS LETTERS, v.39, no.16, pp.4887 - 4890
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS LETTERS
- Volume
- 39
- Number
- 16
- Start Page
- 4887
- End Page
- 4890
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159319
- DOI
- 10.1364/OL.39.004887
- ISSN
- 0146-9592
- Abstract
- A new blue-emitting phosphor, K2ScSi4O10F:Eu2+ (KSSOF:Eu2+), was synthesized through a solid-state reaction. The structural and optical properties of KSSOF:Eu2+ phosphor, in addition to its thermal quenching and fabrication of white LEDs (WLEDs), were investigated for the first time. The phosphor showed broad blue emission, with a maximum at similar to 434 nm under near-ultraviolet excitation due to 5d -> 4f transition of the Eu2+ ion. The critical distance was calculated to be 12 angstrom using the critical concentration of Eu2+ and Dexter's theory for energy transfer. WLEDs were fabricated by blending KSSOF: Eu2+, commercial Lu3Al5O12:Ce3+, and (Sr, Ca)AlSiN3:Eu2+ phosphors, showed a high color rendering index of 88 at a correlated color temperature of 4134 K under a forward bias current of 100 mA.
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