Photoluminescence enhancement of PEG-modified YAG: Ce3+ nanocrystal phosphor prepared by glycothermal method

Ryo Kasuya, Tetsuhiko Isobe, Hitoshi Kuma, Junichi Katano

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Y3A1 5O12:Ce3+ (YAG:Ce3+) nanocrystals were synthesized in 1,4-butylene glycol (BG) with and without poly(ethylene glycol) (PEG) by the glycothermal method. The internal quantum efficiency of the photoluminescence (PL) corresponding to the 5d →4f transition of Ce3+in the YAG:Ce3+nanocrystal increased from 21.3 to 37.9% by addition of PEG, while no appreciable change in the primary particle size, the crystallite size, and the lattice distortion was recognized by transmission electron microscopy and X-ray diffractometry. The thermogravimetry-differential thermal analysis, Fourier transform infrared absorption spectroscopy and 1H → 13C cross-polarization magic angle spinning nuclear magnetic resonance (CP-MAS NMR) confirmed the preferential coordination of PEG to the YAG:Ce3+ nanocrystal. 27 A1 single-pulse excitation MAS NMR reveals that the ratio of the 4-fold coordination site to the 6-fold coordination site increased from 0.53 to 0.72 by addition of PEG. We conclude that the surface modification of the YAG:Ce3+ nanocrystal by PEG induces the surface passivation, the prevention of the oxidation of Ce3+ to Ce4+, the promotion of the incorporation of Ce3+ into YAG and the local structural rearrangement, resulting in the PL enhancement.

Original languageEnglish
Pages (from-to)22126-22130
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number47
DOIs
Publication statusPublished - 2005 Dec 1

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Phosphors
yttrium-aluminum garnet
Nanocrystals
Polyethylene glycols
phosphors
Photoluminescence
nanocrystals
photoluminescence
augmentation
glycols
nuclear magnetic resonance
Nuclear magnetic resonance
cross polarization
butenes
promotion
thermogravimetry
Magic angle spinning
metal spinning
passivity
infrared absorption

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photoluminescence enhancement of PEG-modified YAG : Ce3+ nanocrystal phosphor prepared by glycothermal method. / Kasuya, Ryo; Isobe, Tetsuhiko; Kuma, Hitoshi; Katano, Junichi.

In: Journal of Physical Chemistry B, Vol. 109, No. 47, 01.12.2005, p. 22126-22130.

Research output: Contribution to journalArticle

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