Journal of Adhesion and Interface (접착 및 계면)

The Society of Adhesion and Interface, Korea (한국접착및계면학회)
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Research trend in the development of charge transport materials to improve the efficiency and stability of QLEDs

QLEDs 효율 및 안정성 향상을 위한 전하 수송 소재 개발 동향

  • Gim, Yejin (Department of Polymer Science and Engineering, Kumoh National Institute of Technology) ;
  • Park, Sujin (Department of Polymer Science and Engineering, Kumoh National Institute of Technology) ;
  • Lee, Donggu (Department of Semiconductor Engineering, Gyeongsang National University) ;
  • Lee, Wonho (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
  • 김예진 (금오공과대학교 고분자공학과) ;
  • 박수진 (금오공과대학교 고분자공학과) ;
  • 이동구 (경상국립대학교 반도체공학과) ;
  • 이원호 (금오공과대학교 고분자공학과)
  • Received : 2022.02.22
  • Accepted : 2022.04.13
  • Published : 2022.06.30
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Abstract

Colloidal quantum dots (QDs) have gained attention for applications in quantum dot light emitting diodes (QLEDs) due to their high photoluminescence quantum yield, narrow emission spectra, and tunable bandgap. Nevertheless, non-radiative recombination induced by electron and hole imbalance deteriorates the device efficiency and stability. To overcome the problem, researchers have been trying to enhance hole transport properties of hole transporting layers (HTL) and/or slow down the electron injection in electron transport layer (ETL). Here, we summarize two approaches: i) development of interfacial materials between QD and ETL (or HTL); ii) engineering of HTL by blending or multi-layer approaches.

양자점은 수 나노미터 크기의 반도체 나노입자로 우수한 발광 특성 및 색순도, 간단한 밴드갭 조절의 장점 때문에 이를 발광원으로 사용한 양자점 디스플레이가 차세대 디스플레이로 주목받고 있다. 하지만 전하 주입 불균형 문제로 인해서 소자의 효율 및 안정성에 큰 문제가 발생하고 이를 해결하기 위한 많은 연구가 진행되었다. 본 논문에서는 전자 및 정공 수송층에 중간층을 삽입하여 양자점 디스플레이의 발광과 수명 특성을 향상시킨 연구와 정공 수송층의 구조 변화를 통해서 정공 수송 능력을 향상시킨 연구들에 대해서 소개하고자 한다.

Keywords

Acknowledgement

이 연구는 금오공과대학교 대학 학술연구비로 지원되었음(2021년).

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