Energy transfer and luminescence in perovskite-type oxide phosphors doped with lanthanide ions at B site

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05004
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: Ueda Kazushige 九州工業大学, 大学院工学研究院, 准教授 (70302982)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 蛍光体 / 酸化物 / 希土類イオン / ペロブスカイト / エネルギー移動 / 発光

Outline of Final Research Achievements

Large lanthanide ions usually occupy B-sites in perovskite-type oxides, ABO3. However, it was found previously that Tb3+ ions were located at not only A sites but also B sites in LaScO3. Because the luminescence properties of lanthanide ions located at B sites have not been understood yet, the luminescence of Tb3+ or Eu3+ was examined in some double perovskite-type oxides, where the doped lanthanide ions are restricted to occupy either A or B sites. The site-dependent luminescence of Tb3+ or Eu3+ was clearly observed and the site-dependent luminescence properties and mechanisms were clarified. The site-dependent luminescence properties of Tb3+ or Eu3+ were further elucidated in a simple perovskite-type LaLuO3 doped with Tb3+ or Eu3+ site-selectively. In addition, the Tb3+ luminescence by energy transfer from Ce3+ at A site to Tb3+ at A site or Tb3+ at B site were demonstrated. Because of these findings, the development of new phosphors will be anticipated controlling the doping sites.

Free Research Field

無機材料科学

Academic Significance and Societal Importance of the Research Achievements

ペロブスカイト型酸化物のAサイトに希土類イオンを添加した蛍光体の研究例は数多く存在するため、新しい蛍光体を開発するためには、Bサイトへの添加やエネルギー移動との組み合わせが不可欠である。しかし、それらについては現在ほとんどわかっていない。本研究では、単純ペロブスカイト型酸化物やダブルペロブスカイト型酸化物において、希土類イオンをAまたはBサイトにサイト別に添加して、その発光特性を初めて解明した。さらに、単純なサイト別発光だけでなく、共添加によるエネルギー移動を使ったサイト別発光が起こることを実証し、今後の新規蛍光体の可能性を示唆した。