| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
F. 광기능/디스플레이 재료 분과 |
| 제목 |
Quantum Yield Enhancement in Blue-Emitting Core/Shell Quantum Dots via Shell Surface Passivation with MX2-type Ligands |
| 초록 |
Quantum dots (QDs) have been considered as promising candidates for light sources in display applications owing to their good color saturation, spectral tunability, and high photoluminescence quantum yield (PL QY). However, the PL QYs of blue QDs are inferior to those of green and red QDs due to the high surface to volume ratio of blue QDs, which gives rise to the increment of both cation and anion dangling bonds and non-radiative recombination. To resolve the issue, an advance in surface passivation methods should be required. In this study, we apply a type of MX2 ligand to the surface of ZnSeTe/ZnSe/ZnSeS/ZnS QDs to passivate both cation and anion of the ZnS shell. Zinc-based MX2 ligands are utilized in place of 1-octanethiol (OTT) which is a commonly used an X-type ligand, and can only passivate cation sites on the shell surface. After the MX2 ligand passivation, the quantum yield of the ZnSeTe QDs is enhanced from 82.0% to 94.9%. The results suggest that MX2-type ligand passivation is an available strategy to eliminate non-radiative recombination paths and to improve the PL QYs by bonding with both cation and anion sites on the surface of the QDs. We anticipate that the MX2 ligand strategy can shed light on the quantum dot light emitting diode application for industry. |
| 저자 |
이병준1, 김태수1, 박장웅2, 이수연1, 정성묵1, 최영민1
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| 소속 |
1한국화학(연), 2연세대 |
| 키워드 |
<P>Ligand Exchange; Quantum Dot; PLQY; MX2-Ligand; Blue-Emitting</P>
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| E-Mail |
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