光谱学与光谱分析 |
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Effect of Charge Compensation on Emission Spectrum of Sr2SiO4∶Dy3+ Phosphor |
LI Pan-lai, WANG Zhi-jun*,YANG Zhi-ping, GUO Qing-lin |
College of Physics Science & Technology, Hebei University, Baoding 071002, China |
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Abstract The Sr2SiO4∶Dy3+ phosphor was synthesized by the high temperature solid-state reaction method in air. Dy2O3(99.9%), SiO2(99.9%), SrCO3(99.9%), Li2CO3(99.9%), Na2CO3(99.9%) and K2CO3(99.9%) were used as starting materials, and the Dy3+ doping concentration was 2 mol%. The emission spectrum was measured by a SPEX1404 spectrophotometer, and all the characterization of the phosphors was conducted at room temperature. The emission spectrum of Sr2SiO4∶Dy3+ phosphor showed several bands centered at 486, 575 and 665 nm under the 365 nm excitation. The effect of Li+,Na+ and K+ on the emission spectra of Sr2SiO4∶Dy3+ phosphor was studied. The results show that the location of the emission spectrum of Sr2SiO4∶Dy3+ phosphor was not influenced by Li+,Na+ and K+. However, the emission spectrum intensity was greatly influenced by Li+,Na+ and K+,and the evolvement trend was monotone with different charge compensation, i.e. the emission spectrum intensity of Sr2SiO4∶Dy3+ phosphor firstly increased with increasing Li+ concentration, then decreased. However the charge compensation concentration corresponding to the maximum emission intensity was different with different charge compensation, and the concentration is 4, 3 and 3 mol% corresponding to Li+,Na+ and K+,respectively. And the theoretical reason for the above results was analyzed.
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Received: 2007-09-21
Accepted: 2007-12-26
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Corresponding Authors:
WANG Zhi-jun
E-mail: wangzhijunmail@yahoo.com.cn
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