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Bright and Stable Quantum Dot Light-Emitting Diodes

Authors
Lee, TaesooKim, Byong JaeLee, HyunkooHahm, DonghyoBae, Wan KiLim, JaehoonKwak, Jeonghun
Issue Date
Jan-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
continuously graded quantum dots; heat dissipation; high-luminance; multiexciton suppression; quantum dot light-emitting diodes; stability
Citation
ADVANCED MATERIALS, v.34, no.4, pp.1 - 9
Journal Title
ADVANCED MATERIALS
Volume
34
Number
4
Start Page
1
End Page
9
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/145971
DOI
10.1002/adma.202106276
ISSN
0935-9648
Abstract
Quantum dot light-emitting diodes (QLEDs) are one of the most promising candidates for next-generation displays and lighting sources, but they are barely used because vulnerability to electrical and thermal stresses precludes high brightness, efficiency, and stability at high current density (J) regimes. Here, bright and stable QLEDs on a Si substrate are demonstrated, expanding their potential application boundary over the present art. First, a tailored interface is granted to the quantum dots, maximizing the quantum yield and mitigating nonradiative Auger decay of the multiexcitons generated at high-J regimes. Second, a heat-endurable, top-emission device architecture is employed and optimized based on optical simulation to enhance the light outcoupling efficiency. The multilateral approaches realize that the red top-emitting QLEDs exhibit a maximum luminance of 3 300 000 cd m(-2), a current efficiency of 75.6 cd A(-1), and an operational lifetime of 125 000 000 h at an initial brightness of 100 cd m(-2), which are the highest of the values reported so far.
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ICT융합공학부 (전자공학전공)
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