Study on Quantum Efficiency Improvement of Te-free Blue Emitting Zinc Selenide Quantum Dots
- 주제(키워드) Quantum Dots , Te-free Blue , Zinc Selenide
- 주제(DDC) 547
- 발행기관 아주대학교
- 지도교수 김상욱
- 발행년도 2022
- 학위수여년월 2022. 8
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000031997
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Recently, due to the miniaturization of display backlights, interest in blue light-emitting quantum dots is increasing. Quantum dots are attracting attention as a next-generation display material with high color gamut, but the development of blue QDs is necessary to realize perfect self-luminous QLEDs. The inherent inferior photophysical properties of blue light-emitting materials remain a challenge. Many groups have implemented Cd-based quantum dots, but it is unknown whether they can be used commercially due to the toxicity of Cds. Therefore, it is necessary to develop a Cd-free and eco-friendly blue QD. Here, we present the synthesis of ZnSe-based blue-emitting quantum dots using a fast-reactive bis(trimethylsilyl)selenium compound. Light emission of 440 nm to 460 nm or more was obtained by using the SILAR method, which is a method in which positive and negative ions are alternately added. We also performed spectral analysis according to the ratio of Zn to Se. In addition, high-efficiency blue QDs and a maximum quantum yield of 53.2% were achieved by using a hydrofluoric acid and zinc chloride additive to remove stacking defects in the ZnSe crystal structure to increase the luminous efficiency.
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