화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2022년 봄 (04/06 ~ 04/08, 대전컨벤션센터)
권호 47권 1호
발표분야 콜로이드 및 분자조립 부문위원회
제목 Protective Hybrid Ligand Layer for Efficient and Stable ZnTeSe-Based Quantum Dots
초록 ZnTeSe-based quantum dots (QDs) have become irreplaceable, Cd-free blue electroluminescent emitters in future display technology. Although their color purity and quantum yield (QY) have nearly reached to ultimate level, careful handling is demanded due to their vulnerable nature to photochemical stresses. Minimal electron confinement originating from quasi-type-II nature makes them susceptible to surface states generated by ligand desorption and/or oxidation in purification, storage and device fabrication, in turn, degrades photoluminescence QY by surface trapping. To resolve this issue, herein, we propose the hybrid ligand passivation for ZnTeSe-based QDs. Surface modification with zinc halide and alkylthiol significanly improved photochemical stability of QDs against repeating purification and storage under ambient condition. Surface analysis revealed a formation of partially-oxidized zinc thiolate layer, providing robust ligand binding and surface state passivation.
저자 한지수1, 최영호1, 이현준2, 임재훈1
소속 1성균관대, 2KAIST
키워드 Quantum dot; Photoluminescence; Ligand
E-Mail j.lim@skku.edu