title: Facile preparation of YAG:Ce nanoparticles by laser irradiation in water and their optical properties.
abstract: Yttrium aluminum oxide Y3Al5O12 (YAG:Ce) nanoparticles were prepared by laser ablation in liquid, and the photoluminescence (PL) properties of the nanoparticles were investigated. A pellet of YAG:Ce synthesized by co-precipitation in deionized water was irradiated with a focused laser beam to obtain a solution containing dispersed nanoparticles. The compositions and morphologies of the nanoparticles were investigated by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray analysis, and dynamic light scattering. PL and photoluminescence excitation (PLE) spectra at room temperature and low temperature were measured using a fluorescence spectrophotometer. Nanoparticles of YAG single phase as a matrix were obtained by irradiation at high laser energy density. The average particle size was approximately 9 nm, although the nanoparticles were slightly aggregated. The broad peak centered at 540 nm in the PL spectrum was asymmetrically broadened at shorter wavelength. The intensity of the PLE peak centered at 340 nm decreased with increasing energy density of the laser beam. These phenomena were related to the nanosize effect of the YAG:Ce phosphor.
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, #J2-41, Midori-ku, Yokohama, 226-8502 Japan.
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Tsuruoka
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503 Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Sasagawa
authors.affiliation: Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka, 535-8585 Japan.
authors.forename: Tokuo
authors.initials: T
authors.lastname: Yodo
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, #J2-41, Midori-ku, Yokohama, 226-8502 Japan.
authors.forename: Mamoru
authors.initials: M
authors.lastname: Yoshimoto
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, #J2-41, Midori-ku, Yokohama, 226-8502 Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Odawara
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, #J2-41, Midori-ku, Yokohama, 226-8502 Japan.
authors.forename: Hiroyuki
authors.identifier: 0000-0002-5781-5396
authors.initials: H
authors.lastname: Wada
keywords: Laser ablation in liquid; Nanoparticle; YAG:Ce; Yellow phosphor