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Proceedings Paper

The enhancement of light efficiency using modified phosphor which is coated sub-micro size sulfonated polystyrene beads
Author(s): Haisung Lee; Yoongon Park; Myungwhun Chang; Gangpil Kim; Sangsu Hong; Hyungsik Won; Jongmyeon Lee; Yongsoo Oh
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Paper Abstract

We have improved charge character on the surface of phosphor particles by dispersed sub micro miter size sulfonate polystryrene beads and polyelectrolyte dispersant. The surface of TAG phosphor was analyzed with SIMS-TOF. Many hydrocarbon molecules were existed on the TAG phosphor. We could exchange the hydrocarbon into polyelectrolyte and sulfonated polystyrene beads. Characterization of the chemical bonging of polystyrene beads adhered on the surface of the TAG phosphor was archieved with x-ray photoemission spectroscopy (XPS) and FT-Raman. We could measure light efficiency of the white LED with integrating sphere spectrophotometer. Adhering sub micro miter size sulfonated polystyrene beads on the surface of TAG phosphor has enhanced extraction efficiency of light from phosphor. The sulfonated ligand and reduced difference of refractive index between phosphor and encapsulant material are responsible for the enhancement of extraction efficiency light from phosphor. Additional increase of light extraction has been observed when the phosphor particles were coated only on and near the LED chip. Surface modified phosphor particle and phosphor layer have improved LED light efficiency about ten percents.

Paper Details

Date Published: 14 September 2006
PDF: 6 pages
Proc. SPIE 6321, Nanophotonic Materials III, 63210B (14 September 2006); doi: 10.1117/12.678629
Show Author Affiliations
Haisung Lee, Samsung Electro-Mechanics (South Korea)
Yoongon Park, Samsung Electro-Mechanics (South Korea)
Myungwhun Chang, Samsung Electro-Mechanics (South Korea)
Gangpil Kim, Samsung Electro-Mechanics (South Korea)
Sangsu Hong, Samsung Electro-Mechanics (South Korea)
Hyungsik Won, Samsung Electro-Mechanics (South Korea)
Jongmyeon Lee, Samsung Electro-Mechanics (South Korea)
Yongsoo Oh, Samsung Electro-Mechanics (South Korea)

Published in SPIE Proceedings Vol. 6321:
Nanophotonic Materials III
Zeno Gaburro; Stefano Cabrini, Editor(s)

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