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

doi:10.3724/SP.J.1077.2011.00731

Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (7): 731-734.DOI: 10.3724/SP.J.1077.2011.00731

• Research Paper • Previous Articles Next Articles

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

WANG Zhi-Jun¹, LI Yan², WANG Ying¹, LI Pan-Lai¹, GUO Qing-Lin¹, YANG Zhi-Ping¹

(1. College of Physics Science & Technology, Hebei University, Baoding 071002, China; 2. College of Chemistry & Environmental Science, Hebei University, Baoding 071002, China)

Received:2010-09-13 Revised:2010-10-25 Published:2011-07-20 Online:2011-06-20
Supported by:
National Natural Science Foundation of China (50902042); Natural Science Foundation of Hebei Province; (E2009000209, E2010000283); Research Foundation of Education Bureau of Hebei Province (2009313); Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education China (2010LOI12)

Abstract

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.

Key words: white LED, KNaCa₂(PO₄)₂;Eu²⁺, luminescence;crystallographic sites

CLC Number:

O644
O482

WANG Zhi-Jun, LI Yan, WANG Ying, LI Pan-Lai, GUO Qing-Lin, YANG Zhi-Ping. Luminescence and Crystallographic Sites of Eu²⁺ in KNaCa₂(PO₄)₂[J]. Journal of Inorganic Materials, 2011, 26(7): 731-734.

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

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