Fluorescence Properties and Synthesis of Green-Emitting Tb3+-Activated Amorphous Calcium Silicate Phosphor by Ultraviolet Irradiation of 378 nm. (8th February 2012)

• Record Type: Journal Article
• Authors: Kojima, Yoshiyuki; Numazawa, Masaaki; Kamei, Shinnosuke; Nishimiya, Nobuyuki
• Other Names: Lin Gong Ru Academic Editor.
• Is Part Of: International journal of optics. Volume 2012(2012)
• Publication Date: 2012-02-08
• Subjects: Optics -- Periodicals; Optics; Periodicals; 535
• DOI: 10.1155/2012/537949
• Languages: English
• ISSNs: 1687-9392

Abstract

Abstract : The excitation wavelength of conventional Tb 3+ -activated phosphor is near 270 nm. This study describes novel green-emitting Tb 3+ -activated amorphous calcium silicate by ultraviolet excitation at 378 nm. The Tb 3+ -activated amorphous calcium silicate was prepared by heating a sample of Tb 3+ -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 Tb 3+ -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 Tb 3+ ions existing in the layer of the CSH lead to loss of water molecules and OH groups.