光谱学与光谱分析, 2018, 38 (9): 2681, 网络出版: 2018-10-02   

纳米YAG∶Ce3+, Mn+(Mn+=Ca2+, Gd3+)荧光粉的结构与发光性能

Structure and Optical Properties of YAG∶Ce3+, Mn+(Mn+=Ca2+, Gd3+) Nano-Phosphor
作者单位
1 江西理工大学材料科学与工程学院, 江西 赣州 341000
2 江西理工大学冶金与化学工程学院, 江西 赣州 341000
3 江西钨业集团稀土新材料有限公司, 江西 赣州 341000
摘要
当前商用白光LED器件中YAG∶Ce3+荧光粉的单一黄光发射, 导致其缺乏红光限制了器件的应用和发展, 在YAG∶Ce3+中掺杂其他离子是解决该问题的有效途径之一。 采用溶胶凝胶法制备了系列单掺Ce3+, Ca2+和Gd3+的YAG纳米荧光粉。 研究了离子掺杂量对荧光粉的物相、 结构、 形貌、 粒度、 发光性能及量子效率的影响, 分析了发光机理。 结果表明: 制备的纳米荧光粉粒径为100~200 nm。 Ce3+和Gd3+掺杂时均得到YAG纯相, 但晶体结构膨胀, 晶面衍射峰向小角度方向移动。 样品结晶度随Ce3+和Ca2+(<0.025 mol)掺杂量增大变化不明显, 随Gd3+则呈现逐步降低趋势。 三种离子掺杂量增大时, Ce3+的晶格能上升, 5d能级晶体场劈裂加剧; Gd系列荧光粉激发和发射光谱随掺杂量的增大发生红移, Ce和Ca系列则因掺杂量小表现不明显。 荧光粉发光强度随Ce3+掺杂量上升先增大后减小, 最佳掺杂量为0.06 mol; 随Gd3+掺杂量增加逐步降低; 随Ca2+掺杂量增大则急剧下降, 0.03 mol掺杂量时荧光强度几乎为零, YAG晶体结构破坏, 生成YAM和YAP相。 研究的开展, 将对后续纳米YAG荧光粉及其相关功能材料的进一步开发使用提供一定的理论依据和实践参考。
Abstract
The shortage for red-light of current commercial white-light LED due to a single yellow-light emitting of YAG∶Ce3+ phosphor restricts its development and application. Ce3+, Ca2+, Gd3+ doped respectively YAG Nano-phosphors in the paper were obtained by using sol-gel method. The phase composition, structure, morphology, particle size, luminescence properties as well as internal quantum efficiency and mechanism of the phosphors with different ions doping content were thoroughly investigated. The particle size of phosphors was 100~200 nm. Pure YAG was obtained as doping Ce3+ and Gd3+, however, the crystal structures expand and X-ray diffractive peaks shifted toward small angles. The crystallinity of samples had no obvious variation with increasing Ce3+ and Ca2+(<0.025 mol) contents, but decreased with increasing Gd3+. The crystal field energy and degree of crystal field split for 5d state of Ce3+ increased with increasing all ions doping contents, and excitation, emission spectra of Gd series phosphors had red shift, whereas Ce, Ca series were negligible due to small doping contents. The photoluminescence (PL) intensity first increased and then decreased with increasing Ce3+ doping contents, and the optimize content was 0.06 mol. However, the PL intensity decreased gradually with the increase of Gd3+ doping contents, but decreased dramatically as increasing Ca2+ contents. The crystal structure was destroyed and PL intensity was close to zero as Ca2+ content run up to 0.03 mol, and impure phases of YAM and YAP produced. The research will provide a theoretical basis and practical reference for the further development and application of nano-YAG phosphors and related functional materials.

夏李斌, 王令, 王林生, 游维雄, 谢晶冰, 李子成. 纳米YAG∶Ce3+, Mn+(Mn+=Ca2+, Gd3+)荧光粉的结构与发光性能[J]. 光谱学与光谱分析, 2018, 38(9): 2681. XIA Li-bin, WANG Ling, WANG Lin-sheng, YOU Wei-xiong, XIE Jing-bing, LI Zi-cheng. Structure and Optical Properties of YAG∶Ce3+, Mn+(Mn+=Ca2+, Gd3+) Nano-Phosphor[J]. Spectroscopy and Spectral Analysis, 2018, 38(9): 2681.

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