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

Ryo Kasuya, Tetsuhiko Isobe, Hitoshi Kuma, Junichi Katano

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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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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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