| 光谱学与光谱分析 |
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| Synthesis and Luminescent Properties of Novel Red Phosphor SrO·Y2O3∶Eu |
| ZHAI Yong-qing,YANG Guo-zhong,LIU Yu,LIU Hong-mei |
| College of Chemistry and Environmental Science,Hebei University,Baoding 071002,China |
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Abstract A novel red-emitting phosphor SrO·Y2O3∶Eu was synthesized by glycine combustion process. The phases and structure,the size and morphology,and the luminescent properties of the samples were investigated respectively by XRD,SEM and fluorescence spectrophotometer(FL). The results show that the samples include two phases,SrY2O4 and Y2O3,which belong to orthorhombic system and cubic system respectively. The particles of SrO·Y2O3∶Eu obtained at 1 200 ℃ are nearly spherical in shape,and the mean grain size is in the range of 100-200 nm. The excitation spectrum of SrO·Y2O3∶Eu phosphor shows a broad band with a main peak around 280 nm,which is due to the charge-transfer (CT) in the excitation of an electrons from the oxygen 2p state to an Eu3+ 4f state. Excited with a radiation of 280 nm,the phosphor emits strong red fluorescence,and the main emission peak is around 592 nm,which can be assigned to the transition of 5D0→7F1 of Eu3+ ion. Another strong emission peak is at 614 nm,which can be assigned to the transition of 5D0→7F2 of Eu3+ ion. Moreover,it was found that the ratio of glycine to nitrate ion,calcinations temperature and the concentration of Eu3+ have significant effect on the luminescent intensity of SrO·Y2O3∶Eu.
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Received: 2006-11-16
Accepted: 2007-02-26
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Corresponding Authors:
ZHAI Yong-qing
E-mail: zhaiyongqinghbu@163.com
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