High color rendering white light-emitting diodes based on a green silicate phosphor mixed with a red dye-bridged hybrid

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White light-emitting diodes (LEDs) using a wavelength converter composed of a red dye-bridged hybrid (DBH) mixed with a green silicate phosphor are fabricated. The red DBH is synthesized by chemically bonding epoxy functional oligosiloxane and red fluorescent dye for application in a red wavelength converter of white LEDs. To date, inorganic phosphors and quantum dots have been reported as red emitters. In this report, we suggest a dye based red wavelength converter for high color rendering white LEDs. The structural and optical properties of the DBH are evaluated. The fabricated white LEDs have a high color rendering index up to 90. They show facile color temperature tunability, a broad color gamut, and sufficient efficacy of 33.3 lm W-1 for applications in lighting technology. Also, both forward-bias current stability and long-term thermal stability are achieved for solid-state lighting applications.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2012
Language
English
Article Type
Article
Keywords

QUANTUM DOTS; LEDS; NANOCRYSTALS; OXYNITRIDE

Citation

RSC ADVANCES, v.2, no.32, pp.12371 - 12377

ISSN
2046-2069
DOI
10.1039/c2ra21795c
URI
http://hdl.handle.net/10203/102456
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
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