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.

一、研究了(Ba,Sr)3SiO5:Eu2+的耐湿性和热猝灭性的原子尺度起源。通过粉末 X 射线衍射和光致发光 (PL) 发射来评估水分引起的降解。通过Rietveld精修和密度泛函理论（DFT）计算分析了晶体结构和电子分布。研究发现，电子的色散与有效碰撞有关，进而与主晶格的稳定性有关。此外，提出了Voronoi-Dirichilet多面体（VDP）来评估周围离子对电子色散的空间影响。最后，我们将全局不稳定性指数（GII）与晶格振动引起的热猝灭相关联，表明热力学对于荧光体主体的重要性。II.报道了一种新的ABC4(O,N)7型氮氧化物荧光粉SrLuAl2Si2O2N5。采用常规固相法合成荧光粉。通过X射线衍射证实了晶体结构。通过光致发光光谱研究了Ce3+和Eu2+掺杂的发光性能。通过热重差热分析（​​TG-DTA）和氧/氮分析来分析热降解。荧光粉的性能通过量子效率和热猝灭测试来表征。

项目成果

Anomalous Orange Light-Emitting (Sr, Ba) 2SiO4: Eu2+ Phosphors for Warm White LEDs

异常橙色发光 (Sr, Ba) 2SiO4：用于暖白光 LED 的 Eu2 荧光粉

• DOI: 10.1021/acsami.6b02237
• 发表时间: 2016
• 影响因子: 9.5
• 作者: Dawei Wen; Hiroki Kuwahara; Hideki Kato; Makoto Kobayashi; Yasushi Sato; Takaki Masaki; 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: 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

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

Ca3Ln(AlO)3(BO3)4:Ce3 ,Tb3 ,Mn2 (Ln = Y, Gd)的位点占用和发光性质

• DOI: 10.1039/c7tc00941k
• 发表时间: 2017
• 影响因子: 6.4
• 作者: Dawei Wen; Hideki Kato*; Makoto Kobayashi; Shunsuke Yamamoto; Masaya Mitsuishi; Masato Kakihana
• 通讯作者: Masato 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