Journal
ADVANCED MATERIALS
Volume 34, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106276
Keywords
continuously graded quantum dots; heat dissipation; high-luminance; multiexciton suppression; quantum dot light-emitting diodes; stability
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Funding
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20010737]
- Creative-Pioneering Researchers Program through Seoul National University
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT, Korea) [NRF-2019R1C1C1006481, NRF-2019M3D1A1078299]
- National Research Foundation of Korea [2019M3D1A1078299] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study demonstrates bright and stable QLEDs on a Si substrate, achieving high brightness, efficiency, and stability through tailored interface and optimized device structure, pushing the development and application of QLEDs.
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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