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High‐Performance Ultrapure Green CdSe/CdS Core/Crown Nanoplatelet Light‐Emitting Diodes by Suppressing Nonradiative Energy Transfer
Author(s) -
Wen Zuoliang,
Liu Pai,
Ma Jingrui,
Jia Siqi,
Xiao Xiangtian,
Ding Shihao,
Tang Haodong,
Yang Hongcheng,
Zhang Chaojian,
Qu Xiangwei,
Xu Bing,
Wang Kai,
Teo Kie Leong,
Sun Xiao Wei
Publication year - 2021
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.202000965
Subject(s) - materials science , optoelectronics , light emitting diode , diode , nanocrystal , quantum efficiency , laser linewidth , nanotechnology , optics , laser , physics
Colloidal nanoplatelets (NPLs) are an emerging semiconductor nanocrystal in the display community due to their ultranarrow emission linewidth. Herein, an ultrapure green emitting nanocrystal light‐emitting diode (LED) based on four‐monolayer CdSe/CdS core/crown NPLs is developed. By applying the nonstacked nanoplates, the nonradiative energy transfer in the NPLs film is successfully suppressed. The nonstacked NPL‐LEDs with pure green emission of 521.5 nm exhibit a low turn‐on voltage of 2.1 V, a maximum luminance of 22 400 cd m −2 , a peak external quantum efficiency (EQE) of 2.16%, which is a sixfold enhancement comparing to the stacked NPL‐LED (EQE = 0.34%). This work demonstrates the potential of core/crown NPLs for ultrawide color gamut displays.