Electrochemically-stable Ligands Bridge the Photoluminescence-electroluminescence Gap of Quantum Dots

Overview

Journal Nat Commun

Specialty Biology

Date 2020 Feb 20

PMID 32071297

Citations 21

Authors

Chaodan Pu

Xingliang Dai

Yufei Shu

Meiyi Zhu

Yunzhou Deng

Yizheng Jin

Xiaogang Peng

Affiliations

Soon will be listed here.

Abstract

Colloidal quantum dots are promising emitters for quantum-dot-based light-emitting-diodes. Though quantum dots have been synthesized with efficient, stable, and high colour-purity photoluminescence, inheriting their superior luminescent properties in light-emitting-diodes remains challenging. This is commonly attributed to unbalanced charge injection and/or interfacial exciton quenching in the devices. Here, a general but previously overlooked degradation channel in light-emitting-diodes, i.e., operando electrochemical reactions of surface ligands with injected charge carriers, is identified. We develop a strategy of applying electrochemically-inert ligands to quantum dots with excellent luminescent properties to bridge their photoluminescence-electroluminescence gap. This material-design principle is general for boosting electroluminescence efficiency and lifetime of the light-emitting-diodes, resulting in record-long operational lifetimes for both red-emitting light-emitting-diodes (T > 3800 h at 1000 cd m) and blue-emitting light-emitting-diodes (T > 10,000 h at 100 cd m). Our study provides a critical guideline for the quantum dots to be used in optoelectronic and electronic devices.

Citing Articles

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