Open AccessFluorescence Properties and Synthesis of Green-Emitting Tb3+-Activated Amorphous Calcium Silicate Phosphor by Ultraviolet Irradiation of 378 nm
Author(s) -
Yoshiyuki Kojima,
Masaaki Numazawa,
Shinnosuke Kamei,
Nobuyuki Nishimiya
Publication year - 2012
Publication title -
international journal of optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.263
H-Index - 17
eISSN - 1687-9392
pISSN - 1687-9384
DOI - 10.1155/2012/537949
Subject(s) - phosphor , amorphous solid , materials science , ultraviolet , calcium silicate , silicate , irradiation , calcium , fluorescence , calcium silicate hydrate , ion , excitation , analytical chemistry (journal) , photochemistry , optoelectronics , optics , chemical engineering , chemistry , crystallography , metallurgy , composite material , physics , organic chemistry , cement , nuclear physics , chromatography , quantum mechanics , engineering
The excitation wavelength of conventional Tb3+-activated phosphor is near 270 nm. This study describes novel green-emitting Tb3+-activated amorphous calcium silicate by ultraviolet excitation at 378 nm. The Tb3+-activated amorphous calcium silicate was prepared by heating a sample of Tb3+-activated calcium silicate hydrate (CSH) at 900°C for 30 minutes. The emission wavelength of the resulting phosphor was 544 nm. The optimum excitation wavelength within the range 300–400 nm was 378 nm. The Tb3+-activated amorphous calcium silicate emitted green by ultraviolet irradiation. The optimum initial Tb/Ca atomic ratio of this phosphor was about 0.5. A mechanism for the action of the phosphor is proposed, in which Tb3+ ions existing in the layer of the CSH lead to loss of water molecules and OH groups
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