Eu3+摩尔浓度对Y2O2S:Eu3+,Mg2+,Ti4+红色长余辉材料光谱的影响

用高温固相法制备了Y2O2S：Eu^3 ，Mg^2 ，Ti^4 红色长余辉材料。测量了该材料的余辉曲线，余辉时间为1h以上；由X射线衍射得到晶体结构为Y2O2S.测量了不同Eu^3 摩尔浓度下的激发光谱和发射光谱，得到从^5DJ(J=0，1，2，3)^-7FJ(J=0，1，2，3，4，5)的发射谱线，并得到位于260，345，468和540nm激发峰。由于激活剂饱和效应，Y2O2S：Eu^3 ，Mg^2 ，Ti^4 发射光谱中513．6，540．1，556．4，587．3和589．3nm属于从^5D2，^5D1到^7FJ(J=0，1，2，3，4)跃迁的发射峰随Eu^3 摩尔浓度的增加相对削弱；激发谱包括位于350nm左右属于电荷转移态吸收(Eu^3 -O^2-，Eu^3 -S^2 )的激发主峰和在可见光区位于468，520和540nm属于Eu^3 离子4f-4厂吸收的激发峰。随着Eu^3 摩尔浓度的增加，位于468，520和540nm的激发峰相对增强。

Effect of Eu3+ Molar Ratio on the Spectra of Y2O2S:Eu3+,Mg2+ and Ti4+ Red Phosphor

Synthesis of Y 2O 2S:Eu 3+, Mg 2+ and Ti 4+red phosphor by flux fusion method was presented. The decay curve of Y 2O 2S:Eu 3+, Mg 2+ and Ti 4+ red phosphor was measured and the afterglow time was over one hour. The emission spectra and excitation spectra were measured, and the effect of Eu 3+ molar ratio on the emission spectra and excitation spectra were also discussed. The emission spectra showed that Y 2O 2S:Eu 3+, Mg 2+ and Ti 4+ had narrow emission peaks. The emission peaks ascribed to Eu 3+ ions transition from 5D J (J=0, 1, 2, 3,) to 7F J (J=0, 1, 2, 3, 4, 5) were found. With the increase of Eu 3+ molar ratio, the emission peaks 513.6, 540.1, 556.4, 587.3 and 589.3 nm ascribed to the energy transition 5D 2, 5D 1 to 7F J(J=0, 1, 2, 3, 4) deteriorated gradually relative to the main emission peak at 627.0 nm. The emission peaks ascribed to energy transition 5D 0 to 7F J(J=0, 1, 2, 3, 4) didn't weaken relative to the main emission peak. It was probably due to the so-called true activator saturation effect. This function on the higher activated states 5D 2 and 5D 1 was more distinct. The excitation spectra of Y 2O 2S:Eu 3+, Mg 2+ and Ti 4+ showed that it had excitation peaks at 350 nm nearby, which was ascribed to the absorption of charge transfer (Eu 3+-O 2-, Eu 3+-S 2-). The excitation peaks at 468, 520 and 540 nm were ascribed to the representative energy transition 4f-4f of Eu 3+ ions. With the increase of Eu 3+ molar ratio, the excitation peaks 468, 520 and 540 nm strengthened relative to the main absorption peak at 350 nm nearby.