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Highly Soluble CsPbBr3 Perovskite Quantum Dots for Solution-Processed Light-Emission Devices
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- Liu, Yong-feng (author)
- Umeå universitet,Institutionen för fysik
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- Tang, Shi (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden; LunaLEC AB, Sweden
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- Fan, Junpeng (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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- (creator_code:org_t)
- 2021-01-13
- 2021
- English.
- In: ACS Applied Nano Materials. - : American Chemical Society (ACS). - 2574-0970. ; , s. 1162-1174
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We report on the synthesis of CsPbBr3 perovskite quantum dots (PeQDs) with a high solubility of 75 g/L in toluene and a good film-forming property, as enabled by a dense layer of didodecyldimethylammonium bromide and octanoic acid surface ligands. The crystalline and monodisperse PeQDs feature a cubic-like shape, with an edge length of 10.1 nm, and a high photoluminescence quantum yield of greater than 90% in toluene solution and 36% as a thin film. We find that the PeQDs are n-type doped following the synthesis but also that they can be p-type and additionally n-type doped by in situ electrochemistry. These combined properties render the PeQDs interesting for the emitter in solution-processed light-emitting electrochemical cells (LECs), and we report a PeQD-LEC with air-stabile electrodes that emits with a narrow emission spectrum (λpeak = 514 nm, full width at half-maximum = 24 nm) and a luminance of 250 cd/m2 at 4 V and a luminance of 1090 cd/m2 at 6.8 V. To reach this performance, it was critical to include a thin solution-processed layer comprising p-type poly(vinyl carbazole) and a tetrahexylammonium tetrafluoroborate ionic liquid between the PeQD emission layer and the anode in order to compensate for the as-synthesized n-type doping of the PeQDs.
Subject headings
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Keyword
- perovskite quantum dots
- surface ligands
- high solubility
- good film forming capacity
- light-emitting electrochemical cell
- ion migration
- Materials Science
- materialvetenskap
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Liu, Yong-feng
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- Yang, Jinpeng
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- Kera, Satoshi
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- Wang, Jia
- Liu, Yongfeng
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- Linköping University
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