| 학회 |
한국고분자학회 |
| 학술대회 |
2014년 가을 (10/06 ~ 10/08, 제주 ICC) |
| 권호 |
39권 2호 |
| 발표분야 |
분자전자 부문위원회 |
| 제목 |
Influence of Shell Thickness on the Performance of Light-Emitting Devices Based on Type-I Core/Shell Heterostructure Quantum Dots |
| 초록 |
We synthesized CdSe/Zn1-XCdXS core/shell heterostructure QDs with varying shell thicknesses and tested them in electroluminescent devices. Spectroscopic analysis reveals that the non-radiative decay pathways in QDs, specifically energy transfer and charging and subsequent non-radiative Auger recombination, are suppressed as the thickness increases. Consequently, the efficiency of a device and the efficiency roll-off characteristics on high current densities are improved. The device composed of CdSe/Zn1-XCdXS with the thickest shell (core radius: 2 nm, shell thickness: 6.3 nm) provide a high device performance (peak E.Q.E. ~ 7.4 %) as well as a record-high brightness (Max luminance ＞ 100,000 cd/m2) in a deep red region. These results show that the structural aspect of QDs correlate with the optical properties of QD solids and the performance of devices. |
| 저자 |
임재훈1, 정병국2, 박명진3, Jeffrey M. Pietryga1, 김재경4, 박영신1, Victor I. Klimov1, 이창희3, 배완기4, 이도창2
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| 소속 |
1Los Alamos National Laboratory, 2KAIST, 3서울대, 4KIST |
| 키워드 |
Nanocrystal quantum dots; type-I heterostructures; light-emitting devices; energy transfer; charging; Auger recombination; efficiency roll-off
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| E-Mail |
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