| 引用本文: | 林易展,杨伟斌,李浩来,凌爽,熊飞兵.新型Na5Y(MoO4)4∶Eu3+红色荧光粉的制备和发光性能研究[J].材料科学与工艺,2023,31(2):69-75.DOI:10.11951/j.issn.1005-0299.20220153. |
| LIN Yizhan,YANG Weibin,LI Haolai,LING Shuang,XIONG Feibing.Preparation and luminescence properties of a new Na5Y(MoO4)4∶Eu3+ red phosphor[J].Materials Science and Technology,2023,31(2):69-75.DOI:10.11951/j.issn.1005-0299.20220153. |
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| 摘要: |
| 目前在LED应用领域,高色温、低显指等问题对白光LED(WLED)的实际应用存在限制,制备一种能够有效发出红光的发光材料,对促进WLED的发展具有重大意义。本文采用高温固相法制备了一系列Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9)荧光粉,利用X射线粉末衍射仪对样品的物相结构进行研究,XRD测试结果表明,Na5Y(MoO4)4∶Eu3+样品的衍射图与纯相Na5Y(MoO4)4完全一致,说明Eu3+掺杂对Na5Y(MoO4)4的晶体结构未产生显著改变。使用荧光粉激发光谱与热猝灭分析系统对样品的发光性能进行了表征,结果显示,Na5Y1-x(MoO4)4∶xEu3+荧光粉在393 nm波长紫外光激发下,发射出峰值波长在614 nm的强红光,通过研究该样品不同掺杂浓度的荧光发射谱,确认Eu3+的最佳掺杂浓度为x=0.7,其浓度猝灭机制为Eu3+之间的电偶极-电偶极相互作用。用紫外可见分光光度计探究了Na5Y0.3(MoO4)4∶0.7Eu3+样品的热稳定性,分析表明,在293~453 K范围内其具有良好的热稳定性,且在423 K时Na5Y0.3(MoO4)4∶0.7Eu3+样品的荧光发射强度约为室温的81%。利用稳态-瞬态光谱仪探究了Na5Y1-x(MoO4)4∶xEu3+样品的荧光寿命,研究发现,样品的荧光寿命在浓度猝灭之前随着掺杂浓度的提高而增大,浓度猝灭后不断减小。用CIE1931 XYZ色度系统对Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9)样品进行表征,结果显示,Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9)的色坐标均位于红色区域,未发生漂移。研究表明,Eu3+掺杂Na5Y(MoO4)4荧光粉在白光LED领域将具有潜在的应用前景。 [HJ0.4mm] |
| 关键词: 发光性能 高温固相反应 荧光粉 Na5Y(MoO4)4∶Eu3+ 白光LED |
| DOI：10.11951/j.issn.1005-0299.20220153 |
| 分类号:O482.31 |
| 文献标识码:A |
| 基金项目:福建省自然科学基金资助项目(2020J01297). |
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| Preparation and luminescence properties of a new Na5Y(MoO4)4∶Eu3+ red phosphor |
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LIN Yizhan, YANG Weibin, LI Haolai, LING Shuang, XIONG Feibing
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(School of Opto-electronic and Communication Engineering, Xiamen University of Technology, Xiamen 361024, China)
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| Abstract: |
| For the current application of LED, problems such as high color temperature and low color rendering index limit the practical application of white LED (WLED). The preparation of a luminescent material that can effectively emit red light is significant for the development of WLED. In this study, a series of Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9) phosphors were prepared by high temperature solid state method. The phase structure of the samples was studied by X-ray powder diffractometer. XRD test results showed that the diffraction pattern of Na5Y(MoO4)4∶Eu3+ samples was completely consistent with that of pure Na5Y(MoO4)4, indicating that Eu3+ doping has no significant impact on the crystal structure of Na5Y(MoO4)4. The luminescence properties of the samples were characterized by the excitation spectrum of the phosphor and the thermal quenching analysis system. Results showed that the Na5Y1-x(MoO4)4∶xEu3+ phosphor emitted a strong red light with a peak wavelength of 614 nm under the excitation of 393 nm ultraviolet (UV) light. By investigating the fluorescence emission spectrum of the samples with different doping concentrations, the optimal doping concentration of Eu3+ was confirmed to be x=0.7, and the concentration quenching mechanism was the electric dipole interaction between Eu3+. The thermal stability of the Na5Y0.3(MoO4)4∶0.7Eu3+ samples was studied by UV visible spectrophotometer. Results showed that the samples had good thermal stability in the range of 293~453 K, and the fluorescence emission intensity at 423 K was about 81% of that at room temperature. Steady state and transient state spectrometer was used to investigate the fluorescence lifetime of Na5Y1-x(MoO4)4∶xEu3+ samples. The fluorescence lifetime of samples increased with the increase in doping concentration before concentration quenching, and decreased continuously after concentration quenching. The CIE1931 XYZ colorimetric system was used to characterize the Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9) samples. Results showed that the color coordinates of Na5Y1-x(MoO4)4∶xEu3+(x=0.1~0.9) were all located in the red region and did not drift. The research demonstrates that Eu3+-doped Na5Y(MoO4)4 phosphor will have potential application prospects in the field of WLED. |
| Key words: luminescence properties high temperature solid state method phosphor Na5Y(MoO4)4∶Eu3+ white LED |
