Journal
ADVANCED OPTICAL MATERIALS
Volume 10, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200918
Keywords
inorganic ligands; light-emitting diodes; protonation; quantum dots; white light emission
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Funding
- National Natural Science Foundation of China [61974098]
- Science and Technology Development Fund, Macau SAR [0044/2021/A]
- 111 Program
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Vacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences
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A ligand exchange strategy is developed to improve the solvent-resistance and charge transporting ability of quantum dot films, enabling the fabrication of high-efficiency white quantum dot light-emitting diodes.
Solution-processed white quantum dot light-emitting diodes (WQLEDs) hold great promise for lighting and backlight applications. Stacked blue/green/red quantum dots (QDs) films as an emitting layer through the layer-by-layer deposition offer a simple way to realize WQLEDs. However, the redissolution issue rising from the deposition of the adjacent QDs layers prevents the fabrication of high-quality multilayer emissive layers. Here, a ligand exchange strategy is developed to improve the solvent-resistance of the QDs films by exposing the QDs films in a trace acid environment. The dissociated hydrions from the acid protonate the aliphatic ligands and desorb them away from QDs' surface, leaving space for inorganic ions to anchor onto the QDs' surface. Importantly, the trace acid does not destroy the morphological properties of QDs films and reserves their initial photoluminescence efficiency. In addition, the charge transporting ability of the QDs is enhanced on account of the replaced inorganic ligands. As result, the stacked WQLEDs display pure white emission with Commission International de I'Eclairage coordinates of (0.34, 0.33), and impressive external quantum efficiency of 9.1% has been demonstrated. This solid-phase ligands exchange strategy provides an alternative way to engineer the surface of QDs for efficient optoelectronics.
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