| 학회 |
한국고분자학회 |
| 학술대회 |
2020년 가을 (10/05 ~ 10/08, 부산컨벤션센터(BEXCO)) |
| 권호 |
45권 1호 |
| 발표분야 |
대학원생 구두발표 (영어발표, 발표15분) |
| 제목 |
Pushing the Band Gap Envelope of Quasi-Type II Heterostructures to Blue: ZnSe/ZnSe1-XTeX/ZnSe Spherical Quantum Wells |
| 초록 |
ZnSe1-XTeX is promising Cd-free quantum dots (QDs) because of its wide band gap tunability. However, there are major obstacles on achieving highly luminescent ZnSe1-XTeX QDs. First, high reactivity of tellurium precursor and large lattice mismatch between ZnSe and ZnTe (7.7 %) induce inhomogeneous nucleation of ZnSe and ZnTe. Second, undisclosed band position of ZnSe1-XTeX hinders designing sophisticate core/shell heterostructures. Herein, we propose highly luminescent ZnSe/ZnSe1-XTeX/ZnSe spherical quantum wells (SQWs) as a new class of Cd-free quasi-type Ⅱ heterostructure. By introducing SQW structure, we alleviate lattice mismatch and interfacial defect effectively and accomplish high PL QY (＞ 90%) even at high X (0.5). Additionally, spectroscopic analysis clarifies quasi-type Ⅱ band alignment of ZnSe/ZnSe1-XTeX/ZnSe QDs. Based on these results, we control two factor, ZnSe shell thickness (dimension) and X (composition), to tune band gap widely with high PL QY. |
| 저자 |
이학준1, 장준혁2, 이승현2, 윤상민2, 허성필2, 배완기2
|
| 소속 |
1서울대, 2성균관대 |
| 키워드 |
ZnSe1-XTeX; spherical quantum well; white light-emitting diodes; quantum dot based light-emitting diodes
|
| E-Mail |
|
