| Autor: |
于红伟 Yu Hong-wei, 周东站 Zhou Dong-zhan, 刘玉峰 Liu Yu-feng, 李旭 Li Xu, 杨志平 Yang Zhi-ping, 马淑媛 Ma Shu-yuan |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Chinese Journal of Luminescence. 32:755-760 |
| ISSN: |
1000-7032 |
| DOI: |
10.3788/fgxb20113208.0755 |
| Popis: |
Sr1-xBaxAl2O4∶Eu2+ phosphors were synthesized in a reducing atmosphere by high temperature solid state method at 1 350 ℃.The patterns of XRD indicated that the crystal structure of the phosphors are the monoclinic phase of SrAl2O4 when x0.4 and the simple hexagonal phase of BaAl2O4 when x≥0.4 because of crystal lattice expands with Ba2+ ion substitution for Sr2+ ion.Photoluminescence experiments were carried out to study the luminescence properties of the phosphors excited under 360 nm.The results showed that emission spectra gradually changed from single green emission(λmax=516 nm) to blue-green dual-emission(λmax1= 441 nm,λmax2=486 nm) with the increase of x. When x was 0.5,there was a better property in Sr0.5Ba0.5Al2O4∶Eu2+.From the relationship between the concentration of Eu2+ ion and the intensities of emissions in Sr0.5Ba0.5Al2O4∶y%Eu2+,we get that the maximum dual-emission intensity when y=0.29%.There exist a concentration quenching effect in Sr0.5Ba0.5Al2O4∶Eu2+, and the study points out that the mechanism of concentration quenching effect is electric dipole-dipole interaction. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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