Eu^(3+)摩尔浓度对Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+)红色长余辉材料光谱的影响

Effect of Eu^(3+) Molar Ratio on the Spectra of Y_2O_2S:Eu^(3+), Mg^(2+) and Ti^(4+) Red Phosphor

用高温固相法制备了Y2 O2 S :Eu3 + ,Mg2 + ,Ti4+ 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Y2 O2 S。测量了不同Eu3 + 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 2 6 0 ,345 ,4 6 8和 5 4 0nm激发峰。由于激活剂饱和效应 ,Y2 O2 S :Eu3 + ,Mg2 + ,Ti4+ 发射光谱中 5 13 6 ,5 4 0 1,5 5 6 4 ,5 87 3和5 89 3nm属于从5D2 ,5D1到7FJ(J =0 ,1,2 ,3,4 )跃迁的发射峰随Eu3 + 摩尔浓度的增加相对削弱 ;激发谱包括位于 35 0nm左右属于电荷转移态吸收 (Eu3 + —O2 -,Eu3 + —S2 -)的激发主峰和在可见光区位于 4 6 8,5 2 0和 5 4 0nm属于Eu3 + 离子 4 f 4 f吸收的激发峰。随着Eu3 + 摩尔浓度的增加 ,位于 4 6 8,5 2 0和 5 4 0nm的激发峰相对增强。

Synthesis of Y2O2S:Eu3+, Mg2+ and Ti4+ red phosphor by flux fusion method was presented. The decay curve of Y2O2S: Eu3+, Mg2+ and Ti4+ red phosphor was measured and the afterglow time was over one hour. The emission spectra and excitation spectra were measured, and the effect of Eu3+ molar ratio on the emission spectra and excitation spectra were also discussed. The emission spectra showed that Y2O2S:Eu3+, Mg2+ and Ti4+ had narrow emission peaks. The emission peaks ascribed to Eu3+ ions transition from D-5(j) (J = 0, 1, 2, 3,) to F-7(J) (J = 0, 1, 2, 3, 4, 5) were found. With the increase of Eu3+ molar ratio, the emission peaks 513.6, 540. 1, 556.4, 587.3 and 589.3 nm ascribed to the energy transition D-5(2), D-5(1) to F-7(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 D-5(0), to F-7(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 D-5(2) and D-5(1) was more distinct. The excitation spectra of Y2O2S:Eu3+, Mg2+ and Ti4+ showed that it had excitation peaks at 350 nm nearby, which was ascribed to the absorption of charge transfer (Eu3+ -O2-, Eu3+ -S2-). The excitation peaks at 468, 520 and 540 nm were ascribed to the representative energy transition 4f-4f of Eu3+ ions. With the increase of Eu3+ molar ratio, the excitation peaks 468, 520 and 540 nm strengthened relative to the main absorption peak at 350 nm nearby.