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首页> 外文期刊>ECS Journal of Solid State Science and Technology >Luminescence Performance and Structural Characteristic of Eu~(2+)-Activated Na_2BaSi_2O_6 Phosphor
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Luminescence Performance and Structural Characteristic of Eu~(2+)-Activated Na_2BaSi_2O_6 Phosphor

机译：Eu〜（2+）激活的Na_2BaSi_2O_6荧光粉的发光性能和结构特征

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摘要

Green-emitting phosphor of Eu~(2+)-doped sodium barium silicate Na_2BaSi_2O_6 was prepared by chemical sol-gel method. The X-ray powder diffraction, SEM, photoluminescence pectra and time resolved emission spectra were measured. The excitation spectra can well match with the emission light of near UV-LED chips (360-400 nm). The luminescence was suggested to originate from two kinds of Eu~(2+) centers, which occupy both Ba~(2+) and Na(2) sites in Na_2BaSi_2O_6 lattices. Energy transfer among the Eu~(2+)-centers was discussed by analyzing the photoluminescence spectra, concentration-dependent luminescence intensity and decay lifetimes. The dependence of the luminescence intensity of Na_2BaSi_2O_6:Eu~(2+) on temperatures was measured. The activation energy (AE) for thermal quenching was reported. The luminescence properties of Na_2BaSi_2O_6:Eu~(2+) were compared with that of BaSiO_3:Eu~(2+). The high luminescence of Na_2BaSi_20g:Eu~(2+) were discussed on the base of luminescence properties and microstracture of Eu~(2+) ion.
机译：采用化学溶胶-凝胶法制备了Eu〜（2+）掺杂的硅酸钠钡硅酸钠Na_2BaSi_2O_6的绿色荧光粉。测量了X射线粉末衍射，SEM，光致发光光谱和时间分辨发射光谱。激发光谱可以很好地与近紫外LED芯片（360-400 nm）的发射光匹配。建议发光源于两种Eu〜（2+）中心，它们同时占据Na_2BaSi_2O_6晶格中的Ba〜（2+）和Na（2）中心。通过分析光致发光光谱，浓度依赖性发光强度和衰变寿命，讨论了Eu〜（2+）中心之间的能量转移。测量了Na_2BaSi_2O_6：Eu〜（2+）的发光强度与温度的关系。报道了用于热淬灭的活化能（AE）。比较了Na_2BaSi_2O_6：Eu〜（2+）和BaSiO_3：Eu〜（2+）的发光特性。基于Eu〜（2+）离子的发光性质和微观结构，讨论了Na_2BaSi_20g：Eu〜（2+）的高发光。

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