Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs

Fanglong Yuan, Ting Yuan, Laizhi Sui, Zhibin Wang, Zifan Xi, Yunchao Li, Xiaohong Li, Louzhen Fan (), Zhan’ao Tan (), Anmin Chen, Mingxing Jin and Shihe Yang ()
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Fanglong Yuan: Beijing Normal University
Ting Yuan: Beijing Normal University
Laizhi Sui: Jilin University
Zhibin Wang: North China Electric Power University
Zifan Xi: Beijing Normal University
Yunchao Li: Beijing Normal University
Xiaohong Li: Beijing Normal University
Louzhen Fan: Beijing Normal University
Zhan’ao Tan: North China Electric Power University
Anmin Chen: Jilin University
Mingxing Jin: Jilin University
Shihe Yang: Peking University

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon’s intrinsic merits of high stability, low cost, and environment-friendliness. However, the CQDs usually give broad emission with full width at half maximum exceeding 80 nm, which fundamentally limit their display applications. Here we demonstrate multicolored narrow bandwidth emission (full width at half maximum of 30 nm) from triangular CQDs with a quantum yield up to 54–72%. Detailed structural and optical characterizations together with theoretical calculations reveal that the molecular purity and crystalline perfection of the triangular CQDs are key to the high color-purity. Moreover, multicolored light-emitting diodes based on these CQDs display good stability, high color-purity, and high-performance with maximum luminance of 1882–4762 cd m−2 and current efficiency of 1.22–5.11 cd A−1. This work will set the stage for developing next-generation high-performance CQDs-based light-emitting diodes.

Date: 2018
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DOI: 10.1038/s41467-018-04635-5

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