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Mixing Entropy-Induced Layering Polydispersity Enabling Efficient and Stable Perovskite Nanocrystal Light-Emitting Diodes
journal contribution
posted on 2018-11-28, 00:00 authored by Sudhir Kumar, Jakub Jagielski, Tian Tian, Nikolaos Kallikounis, Wan-Chi Lee, Chih-Jen ShihColloidal
perovskite nanocrystals are emerging as one of the most
promising candidates for next-generation monochromatic light sources
that require precise bandgap tunability. However, the current efficiency
(ηCE) and operational lifetime in their light-emitting
diodes (LEDs) remain low due to impeded carrier transport and exciton
quenching through the NC ligand layer. Here, we show that the fundamental
limitation can be overcome in the superstructures containing polydisperse
colloidal quantum wells of organic–inorganic hybrid perovskites.
The mixing entropy-induced layering polydispersity promotes the delayed
radiative energy transfer (DRET) that guides exciton transport with
negligible nonradiative losses, boosting the thin-film photoluminescence
quantum yield >96%. By using the superstructures in LEDs, we report
a ηCE of 30.4 cd A–1, with an operational
lifetime (LT50) of 184 min at a high constant driving current
of 10 mA cm–2. These are among the most high-performance
colloidal perovskite nanocrystals LEDs ever demonstrated.
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Stable Perovskite Nanocrystal Light-Emitting Diodes Colloidal perovskite nanocrystalsLT 50NC ligand layerDRETbandgap tunabilitythin-film photoluminescence quantumnonradiative lossesguides exciton transportη CElight-emitting diodeslight sourcesMixing Entropy-Induced Layering Polydispersity Enabling Efficient30.4 cd184 minquantum wellsexciton quenchingsuperstructurelifetimecarrier transportradiative energy transferperovskite nanocrystals LEDs
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