Bottom-Up Synthesis of Carbon Quantum Dots With High Performance Photo- and Electroluminescence
- Bottom-Up Synthesis of Carbon Quantum Dots With High Performance Photo- and Electroluminescence
- 최원국; 원성옥; 이연주; 김홍희; Chan Ho Park; Seunggun Yu; Cheolmin Park; Won-Seon Seo
- carbon dots; LED; electroluminescence; photoluminescence
- Issue Date
- Particle & particle systems characterization : measurement and description of particle properties and behavior in powders and other disperse systems
- VOL 35, NO 7-1800080-7
- 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.
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