MgB_4O_7∶Eu^(3+)的制备及其光致发光特性

Preparation of MgB_4O_7∶Eu^(3+) and its photoluminescent properties

使用溶胶凝胶法制备MgB_4O_7及Eu3+掺杂不同物质量浓度的MgB_4O_7∶Eu^(3+)红色发光材料,对其光致发光性能进行研究.结果表明:MgB_4O_7∶Eu^(3+)在近紫外及可见光范围内属于Eu^(3+)的f-f跃迁激发峰较强,最强激发峰位于383nm.MgB_4O_7基质在近紫外光激发时存在一个宽带的发射,其在400~650nm,与Eu3+的激发峰有重叠.通过对比MgB_4O_7∶Eu^(3+)的发射光谱证明存在基质向Eu^(3+)的能量传递过程,这使得在Eu^(3+)掺杂物质量分数0.5%时就获得较高的发光强度,说明MgB4O7∶Eu^(3+)可以作为近紫外光激发的光致发光材料而应用.

Red luminescent materials MgB_4O_7 and MgB_4O_7∶Eu^（3＋）,which is the MgB_4O_7 doped with different concentrations of Eu^（3＋）,were prepared with sol-gel method and their photoluminescence properties were investigated.The result showed that the Eu^（3＋）-induced f-f transition excitation peak of MgB_4O_7 ∶Eu^（3＋） would be stronger in the visible light and near-ultraviolet region,and the strongest peak would be at383 nm.A broad band emission peak in the region from 400 nm to 650 nm was found in the emission spectra of MgB_4O_7 under near-ultraviolet excitation,which would overlap somewhere with the excitation peaks of Eu^（3＋）.An energy transfer process from host to Eu^（3＋） was found by means of comparing the emission spectra of MgB_4O_7∶Eu^（3＋）,leading to a higher luminance intensity even in the case of only 0.5% of Eu^（3＋） doping concentration and suggesting that MgB_4O_7∶Eu^（3＋） could be applied as photoluminescent material under near-ultraviolet excitation.