Development of a new light-emitting device using a phosphor with oxide-ion conductivity

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05012
• 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: Gunma University
• Principal Investigator: Kyomen Toru 群馬大学, 大学院理工学府, 教授 (10323841)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: エレクトロルミネッセンス / 酸化物 / イオン伝導 / 薄膜

Outline of Final Research Achievements

Time dependences of current, luminance, and current efficiency of the electroluminescence were measured by applying dc voltages to oxide phosphor thin films with oxide-ion conductivity. The time dependences were similar to those of electrochemical emitting cells. This indicates that the electroluminescence occurs through the electrons and holes injected into the phosphor due to high electric-fields at the electrode/phosphor interfaces created by oxide-ion migration. In addition, the injected electron and hole are trapped by an emitting center that excites and emits a photon.

Free Research Field

機能性酸化物材料の研究・開発

Academic Significance and Societal Importance of the Research Achievements

本研究成果の学術的意義は，酸化物イオン伝導体の薄膜に5 V程度の電圧を印加することで酸化物イオン伝導体の電子伝導性と発光特性を制御するという，これまでにない機能を実現したことである．今後，リチウムイオン伝導体や水素イオン伝導体などへ展開が可能であり，その特性を解明することで，新しい発光素子，記憶素子，半導体素子などへの応用が期待される．