高耐熱性を有する白色ＬＥＤ用新規蛍光体の開発

高耐热白光LED用新型荧光粉的开发

• 批准号: 16J05936
• 负责人: 温 大尉
• 金额: $ 0.83万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2016
• 资助国家: 日本
• 起止时间: 2016-04-22 至 2018-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16J05936/
• 关键词: Phosphor; Luminescence; Crystal; LED; Crystal structure; Photoluminesence; Rare earth

I.Atomic scale origin of moisture resistance and thermal quenching for (Ba,Sr)3SiO5:Eu2+ was investigated. The moisture induced degradation was evaluated by the powder X-ray diffraction and photoluminescence (PL) emission. The crystal structure and electron distribution was analyzed by Rietveld refinement and density functional theory (DFT) calculation. It is found that the dispersion of electrons is relevant to effective collision and then the stability of the host lattice. Furthermore, Voronoi-Dirichilet polyhedron (VDP) is put forward to evaluate the spacial influence on the dispersion of electrons by the surrounding ions. Finally, we correlated global instability index (GII) to the lattice vibration induced thermal quenching, suggesting the significance of thermodynamic for phosphor hosts.II.A new ABC4(O,N)7-type oxynitride phosphor SrLuAl2Si2O2N5 is reported. The phosphors were synthesized by conventional solid state method. The crystal structure was confirmed by X-ray diffraction. The luminescence properties doping Ce3+ and Eu2+ were investigated by photoluminescence spectra. The thermal degradation was analyzed by thermogravimetric different thermal analysis (TG-DTA) and oxygen/nitrogen analysis. The performance of the phosphors was characterized by quantum efficiency and thermal quenching tests.

（ba，sr）3SIO5：eu2+的水分抗性和热淬灭的原子尺度起源。通过粉末X射线衍射和光致发光（PL）发射评估水分引起的降解。通过Rietveld的细化和密度功能理论（DFT）计算分析了晶体结构和电子分布。发现电子的分散与有效碰撞以及宿主晶格的稳定性有关。此外，提出了Voronoi-Dirichilet多面体（VDP），以评估周围离子对电子分散的空间影响。最后，我们将全球不稳定性指数（GII）与晶格振动诱导的热猝灭相关联，这表明热力学对磷宿主的重要性。通过常规固态方法合成磷。通过X射线衍射确认晶体结构。通过光致发光光谱研究了掺杂CE3+和EU2+的发光特性。通过热重量表不同的热分析（TG-DTA）和氧/氮分析分析热降解。磷光剂的性能以量子效率和热猝灭测试为特征。

项目成果

Site occupancy and luminescence properties of Ca3Ln(AlO)3(BO3)4:Ce3+,Tb3+,Mn2+ (Ln = Y, Gd)

• DOI: 10.1039/c7tc00941k
• 发表时间: 2017-05
• 期刊: Journal of Materials Chemistry C
• 影响因子: 6.4
• 作者: D. Wen;H. Kato;Makoto Kobayashi;Shunsuke Yamamoto;M. Mitsuishi;M. Kakihana

Solid Solutions and Luminescence Properties of Ce4+-Based Phosphors

Ce4基荧光粉的固溶体及发光性能

• 发表时间: 2017
• 作者: Dawei Wen;Hideki Kato;Makoto Kobayashi;Masato Kakihana
• 通讯作者: Masato Kakihana

Development of novel phosphor based on charge transfer from O2- to Ce4+

开发基于从 O2- 到 Ce4 的电荷转移的新型荧光粉

• 发表时间: 2016
• 作者: Dawei Wen;Hideki Kato，Makoto Kobayashi，Masato Kakihana
• 通讯作者: Hideki Kato，Makoto Kobayashi，Masato Kakihana

Super Stable Phosphors Against Thermal Oxidization

抗热氧化的超稳定荧光粉

• 发表时间: 2018
• 作者: Dawei Wen;Hideki Kato;Makoto Kobayashi;Masato Kakihana
• 通讯作者: Masato Kakihana