YAG and CdSe/ZnSe nanoparticles hybrid phosphor for white LED with high color rendering index

Wonkeun Chung, Hong Jeong Yu, Sun Hee Park, Byung H. Chun, Sung Hyun Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Phosphor conversion white LED was developed using a 460 nm InGaN LED chip as an excitation source and yellow emitting Ce-activated YAG as the phosphor. YAG:Ce phosphor was obtained through solid state reaction (SSR) at 1500 °C, and spray pyrolysis (SP) at 900 °C. The SSR and SP prepared YAG:Ce had strong excitation peaks at 460 nm, and broad band emissions from 540 nm to 580 nm due to d-f transition of the Ce ion. The fabricated white LED using SSR-YAG:Ce and SP-YAG:Ce showed a luminous efficiency of 65.8 lm W-1 with CRI of 65.1, and 92.1 lm W-1 with CRI of 67.7 at 20 mA, respectively. For high CRI values, CdSe/ZnSe nanoparticles emitting at 622 nm were prepared via the wet chemical method. The high CRI values of the white LED were achieved by efficient energy transfer from YAG:Ce to CdSe/ZnSe nanoparticles in hybrid phosphor system. The luminous efficiency of the hybrid phosphor white LED was 77.1 lm W-1 and this device showed an excellent CRI of 92.3 at 20 mA. The CIE of the white LED was varied from (0.34, 0.31) to (0.35, 0.31) when the applied currents increased from 20 to 60 mA.

Original languageEnglish
Pages (from-to)162-166
Number of pages5
JournalMaterials Chemistry and Physics
Volume126
Issue number1-2
DOIs
Publication statusPublished - 2011 Mar 15

Fingerprint

Phosphors
yttrium-aluminum garnet
phosphors
Light emitting diodes
light emitting diodes
Nanoparticles
Color
color
nanoparticles
Spray pyrolysis
Solid state reactions
pyrolysis
sprayers
solid state
Energy transfer
excitation
energy transfer
chips
Ions
broadband

Keywords

  • Luminescence
  • Nanostructure
  • Optical materials
  • Semiconductor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

YAG and CdSe/ZnSe nanoparticles hybrid phosphor for white LED with high color rendering index. / Chung, Wonkeun; Yu, Hong Jeong; Park, Sun Hee; Chun, Byung H.; Kim, Sung Hyun.

In: Materials Chemistry and Physics, Vol. 126, No. 1-2, 15.03.2011, p. 162-166.

Research output: Contribution to journalArticle

Chung, Wonkeun ; Yu, Hong Jeong ; Park, Sun Hee ; Chun, Byung H. ; Kim, Sung Hyun. / YAG and CdSe/ZnSe nanoparticles hybrid phosphor for white LED with high color rendering index. In: Materials Chemistry and Physics. 2011 ; Vol. 126, No. 1-2. pp. 162-166.
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