| 快速合成宽带激发、窄带发射白光LED用Li2CaSiO4∶Eu2+蓝-绿荧光粉 |
| Rapid Synthesis of Broadband Excitation-Narrowband Emission Bluish Green Phosphors Li2CaSiO4∶Eu2+ for White LED |
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| 摘要: 采用微波辅助法合成了蓝-绿色荧光粉Li2CaSiO4∶Eu2+，该荧光粉能很好的与紫外光及蓝光LED匹配。分别采用X射线衍射(XRD)、扫描电镜(SEM)和激发-发射光谱(PLE/PL)对样品进行了表征。X射线衍射数据与标准卡片PDF#27-290很好吻合。扫描电镜测试表明样品粒径在2~5 μm。在紫外光和蓝光激发下，Li2CaSiO4∶1%Eu2+发射主峰位于478 nm，对应于Eu2+的t2g→8S7/2电子跃迁，半高峰宽31 nm。样品发光性能与Eu2+掺杂浓度有关，且Eu2+的最佳掺杂浓度为1%。合成的样品色坐标为(0.09，0.24)，可作为白光LED用蓝-绿色荧光材料。 |
| 关键词: 微波法 白光LED Li2CaSiO4∶Eu2+ |
| 基金项目: |
| Abstract: Eu2+-doped Li2CaSiO4 bluish green phosphors matched well with UV and blue LED were prepared by the microwave assited method. The synthesized products were characterized by XRD、SEM and PLE/PL spectroscopy. The results of XRD matched well with PDF#27-290. SEM images showed that the products had a diameter from 2 to 5 μm. When excited by ultraviolet and blue light, the main emission peak of Li2CaSiO4∶1%Eu2+ located at 478 nm corresponding to the t2g→8S7/2 transition of Eu2+, and peak width at half height was 31 nm. The luminescent properties were investigated as a function of activator (Eu2+) concentration and the critical concentration was found to be 1%. The color coordination of Li2CaSiO4∶1%Eu2+ was (0.09, 0.24)，so they were suitable as bluish green phosphors for white LEDs due to their excellent excitation profile and chromaticity. |
| Keywords: microwave method white LED Li2CaSiO4∶Eu2+ |
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| 宋金壮,刘 伟,李 灏,赵文新,田雪英,闫景辉.快速合成宽带激发、窄带发射白光LED用Li2CaSiO4∶Eu2+蓝-绿荧光粉[J].无机化学学报,2011,27(6):1160-1164. |
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