Highly Symmetric 450 nm Blue Emitting ZnSTe/ZnSe/ZnS Reverse Type- I QDs
- 주제(키워드) Quantum Dots , QLED
- 발행기관 아주대학교 일반대학원
- 지도교수 김상욱
- 발행년도 2024
- 학위수여년월 2024. 8
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000033879
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
ZnSTe/ZnSe/ZnS core/shell/shell quantum dots (QDs) were fabricated using a single ZnS precursor to achieve blue-emitting QDs at 450 nm. In this structure, a small quantity of tellurium (Te) was surface-doped on the inner-core ZnS surface, positioned at the interface with the ZnSe shell. This doping suppressed surface trap emission and induced red-shifted emission in the final ZnSTe/ZnSe/ZnS core/shell/shell QDs, resulting in an improved quantum yield (QY) when the final ZnS shell was applied. These QDs showed a photoluminescence (PL) wavelength of 447 nm, FWHM of 35 nm, and QY of 74%. They exhibited superior symmetry in emission spectrum. The symmetry of the emission at half-maxima indicated 17.3 nm and 18.2 nm on either side of the peak center. When utilized in electroluminescent devices (ELs), quantum-dot light-emitting diodes (QLEDs) demonstrate a band-edge emission with symmetric EL spectra centered at λmax of 451 nm, with a full width at half maximum (FWHM) of 30 nm. They achieve a maximum luminance of 2,200 cd/m², an external quantum efficiency of 4.58%, and a current efficiency of 2.31 cd/A.
more목차
Introduction 1
Experimental Section 4
Results and Discussion 8
Conclusion 13
Tables 14
Figures 17
References 27
