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Carbon nanodots : a metal-free, easy-to-synthesize, and benign emitter for light-emitting electrochemical cells
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- Liu, Yong-feng (author)
- Umeå universitet,Institutionen för fysik,College of Physical Science and Technology, Yangzhou University, Yangzhou, China
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- Tang, Shi (author)
- Umeå universitet,Institutionen för fysik,LunaLEC AB, Umeå, Sweden
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- Wu, Xiuyu (author)
- Umeå universitet,Institutionen för fysik
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- (creator_code:org_t)
- 2022-03-15
- 2022
- English.
- In: Nano Reseach. - : Springer. - 1998-0124 .- 1998-0000. ; 15:6, s. 5610-5618
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Light-emitting electrochemical cells (LECs) can be fabricated with cost-efficient printing and coating methods, but a current drawback is that the LEC emitter is commonly either a rare-metal complex or an expensive-to-synthesize conjugated polymer. Here, we address this issue through the pioneering employment of metal-free and facile-to-synthesize carbon nanodots (CNDs) as the emitter in functional LEC devices. Circular-shaped (average diameter = 4.4 nm) and hydrophilic CNDs, which exhibit narrow cyan photoluminescence (peak = 485 nm, full width at half maximum = 30 nm) with a high quantum yield of 77% in dilute ethanol solution, were synthesized with a catalyst-free, one-step solvothermal process using low-cost and benign phloroglucinol as the sole starting material. The propensity of the planar CNDs to form emission-quenching aggregates in the solid state was inhibited by the inclusion of a compatible 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene host compound, and we demonstrate that such pristine host-guest CND-LECs turn on to a peak luminance of 118 cd·m−2 within 5 s during constant current-density driving at 77 mA·cm−2.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- carbon nanodot
- light-emitting electrochemical cell
- phloroglucinol
- solution-based fabrication
- sustainable synthesis
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- art (subject category)
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