Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-14756-5
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Funding
- National Key R&D Program of China [2016YFB0401600]
- National Natural Science Foundation of China [91833303]
- Fundamental Research Funds for the Central Universities [2017XZZX001-03A]
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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-95 > 3800 h at 1000 cdm(-2)) and blue-emitting light-emitting-diodes (T-50 > 10,000 h at 100 cdm(-2)). Our study provides a critical guideline for the quantum dots to be used in optoelectronic and electronic devices.
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