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Study on Quantum Efficiency Improvement of Te-free Blue Emitting Zinc Selenide Quantum Dots
- Author(s)
- 하진수
- Advisor
- 김상욱
- Department
- 일반대학원 분자과학기술학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2022-08
- Language
- eng
- Keyword
- Quantum Dots; Te-free Blue; Zinc Selenide
- Alternative Abstract
- 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.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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