铝酸锶铕的合成与发光的研究

本文详细报导4(SrEu)O·7Al2O3.磷光体的合成及激活剂Eu2+离子浓度、硼酸、五氧化二磷等对磷光体发光强度,发射光谱和激发光谱的影响.讨论了不同Eu2+离子之间的能量传递.测量了不同Eu2+浓度下磷光体的荧光寿命和长余辉特性.

STUDY ON SYNTHESIS AND LUMINESCENCE PROPERTY OF EUROPIUM-ACTIVATED STRONTIUM ALUMINATE

The synthesis of 4 (SrEu)O·7Al2O3 phosphor and the effects of the concentration of activator Eu, contents of B2O3 and P2O5 on fluorescence property were investigated.The phosphors were prepared by solid state reaction of Al(OH)3, SrCO3, Eu2O3 and H3BO3, firing in air at 1550℃ for 3hr followed by flowing in H2-N2 at 1250℃ for 3hr.It was found that B2O3 and P2O5 influenced the luminescence brightness and emission spectra of the phosphor. The emission peak of phosphor shifted from 520nm to 490nm with adding H3BO3 and (NH4)2 HPO4 in raw material. Meanwhile, the emission intensity was remarkably enhanced by adding (NH4)ZHPO4 to starting material.The results show that adding P2O5 to 4(Sr1-xEux)0.7Al2O3 leads to more effective energy transfer from 410 emititng center to 490nm one. The two bands might be originated from inequivalent Eu ions (Eu ions on different crystallographic sites)In addition to the fast decay of phosphor (τ~40-50μs), the long fluorescence aftergrow was also observed to last for a few hours.