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Luminescence and Crystallographic Sites of Eu2+ in KNaCa2(PO4)2

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Author(s): WANG Zhi-Jun, LI Yan, WANG Ying, LI Pan-Lai, GUO Qing-Lin, YANG Zhi-Ping

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 731;
Date: 2011;
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Keywords: white LED; KNaCa2(PO4)2;Eu2+; luminescence;crystallographic sites

ABSTRACT
A blue phosphor, KNaCa2(PO4)2:Eu2+, was prepared by the high temperature solid―state method, and its luminescent characteristics were investigated. The spectral characteristics show that it can be effectively excited by near ultraviolet light (400 nm), and exhibits blue light (470 nm). The crystallographic sites of Eu2+ in KNaCa2(PO4)2 are calculated by van Uitert formula. In KNaCa2(PO4)2:Eu2+, the emission band centered at 461 nm originates from the Eu2+ center of the eight compounds, and the emission band centered at 502 nm originates from the Eu2+ center of the six compounds. The influence of Eu2+ concentration on the emission intensity of the phosphor is investigated. The result shows that the emission intensities firstly increase with the increase in Eu2+ concentration, reach a maximum at 1mol% Eu2+, and then decrease. The concentration quenching mechanisms are the d―d interaction by Dexter theory.
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