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.
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