Structure model of surface modification of ceramics phosphors and influence on the emission efficiency

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K06828
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Anan National College of Technology
• Principal Investigator: Konishi Tomoya 阿南工業高等専門学校, 創造技術工学科, 教授 (90455163)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: セラミックス蛍光体 / アップコンバージョン発光 / 希土類イオン / 表面修飾

Outline of Final Research Achievements

Er3+-doped NaYF4 nanophosphors are potentially used for security ink and fluorescence bioimaging probes. Surface modification of nanophosphors with vinyl group and macromonomers is useful for homogeneous dispersion of phosphors in solvent. It is necessary, however, to investigate the effect of the surface modification on luminescence properties. In this study, we examined the hydrothermal synthesis of Er3+-doped NaYF4 nanophosphors and the effect of surface modification on the upconversion emission intensity under 980 nm excitation. It was found that the emission intensities of 550 and 670 nm emission bands maintained by 50 % and 60 % after surface modification, respectively. Surface modified-Er3+-doped NaYF4 particles were dispersed in ethanol-hexane solvent and upconversion emission was visible in the solution along the light path of 980 nm laser excitation.

Free Research Field

材料科学

Academic Significance and Societal Importance of the Research Achievements

希土類添加セラミックスナノ蛍光体インクの製造において，ポリマーによる表面修飾プロセスのコスト低減に貢献できる．これにより，簡便かつ強力な偽造防止技術，安価な医療用画像診断技術の発展につながり，その成果は社会学，情報科学，医学，生化学など多岐に波及を見込むことができる．また，本研究の成果は，様々な機能性ポリマーの修飾に応用することができ，例えば，発光特性に化学応答性（pH，濃度など）・物理応答性（温度，電場など），標的応答性（吸着対象など）を有する，新たな機能性蛍光体への展開も期待できる．