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电荷迁移态敏化Ba3Gd2WO9:Eu3+红色荧光粉的光学性能
作者:平兆艳 周薇薇 郑庆华   
单位:(淮南师范学院化学与材料工程学院 安徽 淮南 232038) 
关键词:铕掺杂钨酸钆钡 高温固相法 发光 电荷迁移态 红色荧光粉 
分类号:O482.31
出版年,卷(期):页码:2019,47(4):0-0
DOI:
摘要:

 采用高温固相法制备了一系列不同Eu3+掺杂浓度的Ba3Gd2WO9:Eu3+红色荧光粉,并对其结构、形貌、光致发光以及电致发光特性进行了研究。结果表明:Eu3+的7F0 →5L6激发带坐落在O2–→ W6+ 电荷迁移带的肩部,后者有效提高了395 nm处激发线宽与强度;在近紫外光激发下,5D0 → 7F2电偶极跃迁与5D0 →7F1磁偶极跃迁强度相当,反映出Eu3+同时占据具有中心和非中心对称的多个结晶学格位。根据荧光强度与掺杂浓度的变化趋势,确定出最佳Eu3+掺杂量为50%(摩尔分数),并得出浓度猝灭是由Eu3+间电偶极−电偶极相互作用引起;利用5D0–电荷迁移态共振跃迁模型分析了荧光温度猝灭行为,并计算得到热活化能为0.367 3 eV。将此荧光粉涂覆在近紫外LED芯片上,得到了性能优良的红光和白光LED灯珠。

 Ba3Gd2WO9:Eu3+ red-emitting phosphors with different Eu3+ contents were prepared via high-temperature solid-phase reaction. The structure, morphology, photoluminescence and electroluminescence were investigated. The 7F0 → 5L6 transition of Eu3+ situates on the shoulder of the O2– → W6+ charge transfer state (CTS), while the latter enhances the excitation width and intensity at 395 nm. Upon the near-ultraviolet excitation, the emission intensity for 5D0 → 7F2 electric dipole (ED) transition is comparable to that for 5D0 → 7F1 magnetic dipole (MD) transition, indicating that Eu3+ occupies simultaneously the crystallographic multi-sites with and without the inversion centers. The dependence of integrated intensity on Eu3+ contents reveals the optimal composition (Eu3+-doping amount of 50% in mole fraction) and the ED–ED interaction, resulting in the concentration quenching. The thermal quenching was analyzed in the framework of 5D0–CTS resonance transition model, from which the activation energy (0.367 3 eV) was determined. The prototype LEDs fabricated by coating the phosphors on the near-UV chips emit a bright light.

基金项目:
安徽省科技厅自然科学基金(1708085QE91);安徽省教育厅自然科学基金(gxyqZD2016259,gxyqZD2016260,gxbjZD37,KJ2016A673);淮南市级/校级科研创新团队(2016A24);校级研究项目(2015xj04zd,2015hsjyxm07,2015hsyxkc15,2017hsyxkc70)。
作者简介:
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