Bottom-Up Synthesis of Carbon Quantum Dots With High Performance Photo- and Electroluminescence

Title
Bottom-Up Synthesis of Carbon Quantum Dots With High Performance Photo- and Electroluminescence
Authors
최원국원성옥이연주김홍희Chan Ho ParkSeunggun YuCheolmin ParkWon-Seon Seo
Keywords
carbon dots; LED; electroluminescence; photoluminescence
Issue Date
2018-07
Publisher
Particle & particle systems characterization : measurement and description of particle properties and behavior in powders and other disperse systems
Citation
VOL 35, NO 7-1800080-7
Abstract
Although carbon quantum dots (CQDs) are of great interest because of cost effectiveness and environmental compatibility with the facile tunability of their optical properties, poor photo- and electroluminescence (EL) of CQDs limits further implementation. Here, a novel bottom-up synthetic route for fabricating highly crystalline CQDs suitable for high-brightness blue lightemitting diodes is demonstrated. The two-step solution process is based on time-controlled thermal carbonization of citric acid, followed by ligand exchange of the CQDs with oleylamine (OA) in solution. Carbonization allows for the nucleation and growth of crystalline CQDs, while OA treatment disperses the CQDs and stabilizes the solution, giving rise to CQDs with low structural defects and uniform sizes. The systematic study reveals the origin of the light emission of OA-treated CQDs by photoluminescence (PL) analysis, which yields a high quantum efficiency of ≈ 30%. The photoluminescence-optimized OA-treated CQDs exhibit excellent blue EL performance with a low turn-on voltage of ≈ 4 V and high brightness of 308 cd m− 2; a negligible voltage-dependent color shift when they are employed to an inverted lightemitting diode.
URI
http://pubs.kist.re.kr/handle/201004/67666
ISSN
0934-0866
Appears in Collections:
KIST Publication > Article
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