title: Size control and vacuum-ultraviolet fluorescence of nanosized KMgF3single crystals prepared using femtosecond laser pulses.
abstract: We fabricated nanosized KMgF3single crystals via a dry pulsed laser ablation process using femtosecond laser pulses. The sizes, shapes, and crystallographic properties of the crystals were evaluated by transmission electron microscopy (TEM). Almost all of the particles were spherical with diameters of less than 100 nm, and they were not highly agglomerated. Selected-area electron diffraction and high-resolution TEM analyses showed that the particles were single crystals. Particle diameter was controlled within a wide range by adjusting the Ar ambient gas pressure. Under low gas pressures (1 and 10 Pa), relatively small particles (primarily 10 nm or less) were observed with a high number density. With increasing pressure, the mean diameter increased and the number density drastically decreased. Vacuum-ultraviolet cathodoluminescence was observed at 140-230 nm with blue shift and broadening of spectrum.
authors.affiliation: Nagoya Institute of Technology , Nagoya , Japan.
authors.forename: Sotaro
authors.initials: S
authors.lastname: Muramatsu
authors.affiliation: Nagoya Institute of Technology , Nagoya , Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yanagihara
authors.affiliation: Nagoya Institute of Technology , Nagoya , Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Asaka
authors.affiliation: Nagoya Institute of Technology , Nagoya , Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Ono
authors.affiliation: Tokuyama Corporation , Tokyo , Japan.
authors.forename: Tomohito
authors.initials: T
authors.lastname: Nagami
authors.affiliation: Tokuyama Corporation , Tokyo , Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Fukuda
authors.affiliation: Tokuyama Corporation , Tokyo , Japan.
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Suyama
authors.affiliation: Institute for Materials Research, Tohoku University , Sendai , Japan.
authors.forename: Yuui
authors.initials: Y
authors.lastname: Yokota
authors.affiliation: Nara Institute of Science and Technology , Nara , Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yanagida
authors.affiliation: Institute for Materials Research, Tohoku University , Sendai , Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yoshikawa
keywords: 102 Porous / Nanoporous / Nanostructured materials; 204 Optics / Optical applications; 305 Plasma / Laser processing; 40 Optical, magnetic and electronic device materials; 503 TEM, STEM, SEM; 505 Optical / Molecular spectroscopy; Fluoride; VUV; cathodoluminescence; nanoparticles; pulsed laser ablation