Effect of flux on the composition and luminescent properties of Ca0.68Mg0.2SiO3:0.12Eu(3+) red phosphor
Effect of flux on the composition and luminescent properties of Ca0.68Mg0.2SiO3:0.12Eu(3+) red phosphor
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助熔剂对Ca0.68Mg0.2SiO3:0.12Eu(3)红色荧光粉成分及发光性能的影响
DOI：
10.1016/j.jlumin.2016.06.063
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发表时间：
2016
影响因子：
3.6
通讯作者：
Han Tao
中科院分区：
文献类型：
--
作者：
Wang Jin Shan;Zhu Da-chuan;Zheng Qi;Han Tao
以化学共沉淀法制备的前驱体为原料，采用不同助熔剂，采用一步焙烧法制备了Ca0.68Mg0.2SiO_3：0.12Eu3+红色发光材料。用X射线衍射法和荧光分光光度法研究了Ca0.68Mg0.2SiO_3：0.12Eu3+的结构和发光性能。结果表明，加入助熔剂后，在不改变样品物相组成的情况下，结晶度显著增加。此外，这些助熔剂还大大提高了发射峰的强度和量子效率。随着助熔剂(Li_2CO_3或K_2CO_3)浓度的增加，Ca0.68Mg0.2SiO_3：0.12Eu~(3+)的发光强度先增大后减小。同时，在发射光谱中观察到红移现象。Li2CO3和K2CO3的最佳添加量分别为6%和5%，在最佳添加量下焙烧的样品发光强度分别是不加助熔剂样品的42倍和48倍。K2CO3比Li2CO3在提高荧光粉发光强度方面表现出更好的效果。
Ca0.68Mg0.2SiO3:0.12Eu3+red-emitting phosphor was synthesized via one-step calcination process of the precursor prepared by chemical coprecipitation with different fluxes. Then X-ray diffraction and fluorescence spectrophotometry were adopted to investigate the structure and luminescent properties of Ca0.68Mg0.2SiO3:0.12Eu3+. The results indicated that adding fluxes increased the crystalline significantly while the phase composition of samples was not changed. Furthermore, the fluxes improved the intensity of emission peak and the quantum efficiency greatly. With the concentration of flux (Li2CO3or K2CO3) increasing, the emission intensity of Ca0.68Mg0.2SiO3:0.12Eu3+firstly increased and then decreased. Meanwhile, red-shift phenomenon was observed in the emission spectra. The optimal adding fraction of Li2CO3and K2CO3was 6% and 5% respectively, and the luminous intensity of samples calcined with the optimum adding amount of Li2CO3, K2CO3is 42 and 48 times that of the samples without flux. K2CO3showed a better effect on improving the emission intensity of the phosphors than Li2CO3.