Development of Quantum Dot LED with plasmonic metal nanostructures

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05441
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Kitami Institute of Technology
• Principal Investigator: Kiba Takayuki 北見工業大学, 工学部, 准教授 (40567236)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: プラズモン / 発光増幅 / 有機EL / 量子ドット

Outline of Final Research Achievements

The purpose of this study is to improve emission efficiency by utilizing the emission enhancement effect of localized surface plasmon (LSP) of metallic nanostructures incorporated in light-emitting devices. For this purpose, we have investigated metal nanostructures suitable for emission materials with low quantum efficiency, confirmed the luminescence amplification effect by time-resolved PL measurements, and fabricated metal nanostructures in the devices. We fabricated nanostructures by annealing thin metal films and metal nanomesh structures by nanosphere lithography, and confirmed that the LSP resonance wavelengths can be controlled within the visible range and the ability to enhance emission in combination with light-emitting materials. The effectiveness of surface plasmons generated in metal/dielectric multilayered thin films as well as nanostructures was also confirmed.

Free Research Field

光物理化学

Academic Significance and Societal Importance of the Research Achievements

金属ナノ構造の作製・評価や発光材料との組み合わせによる発光増幅現象の観測・機構解明、および金属/誘電体複合薄膜の発光デバイスへの応用を進めた。それに加え電磁界シミュレーションによる解析から、金属ナノ構造や複合薄膜の中に生じるプラズモンモードとの対応関係を明らかにした上で、発光増幅の機構についての理解が進んだ。得られた知見を基に、発光デバイス、特に電極構造のデザインを最適化することが可能となる。これにより近年需要が大きく広がっているディスプレイ用途の有機EL素子等の省電力化を図ることができる。