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Synthesis, Characterization, and Luminescent Properties of CaS:Eu Phosphor
Author(s) -
Kim Kyung Nam,
Kim JaeMyung,
Choi Kyoung Jae,
Park Joung Kyu,
Kim Chang Hae
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01139.x
Subject(s) - phosphor , luminescence , analytical chemistry (journal) , materials science , emission intensity , europium , doping , quenching (fluorescence) , mineralogy , chemistry , optics , optoelectronics , fluorescence , physics , chromatography
Europium‐doped calcium sulfide phosphor was synthesized by a co‐precipitation method using calcium carbonate and ammonium sulfate as the sources for calcium and sulfide, respectively. Reduction of the precipitated CaSO 4 into CaS was carried out at 550°, 750°, 950°, and 1150°C at a flow rate of H 2 5 mL/min and N 2 95 mL/min. The formation of crystalline CaS phase was evident by the X‐ray diffraction analysis of the fired products. The phosphor yielded red emission of wavelength 634 nm for the excitation wavelength of 465 nm. The emission intensity of the phosphors increased with increasing firing temperature from 550° to 950°C, but firing at 1150°C showed a dramatic decline in emission due to thermal quenching. The study of the effect of Eu loading level showed a decrease in emission with an increase in loading, and the optimum loading for maximum emission was found to be 0.5 mol%. And it can be possible to generate white light of light emitting devices by mixing with SrGa 2 S 4 :Eu green phosphor and this phosphor on the 460 nm InGaN blue chip.