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Ultrahigh current efficiency of light-emitting devices based on octadecylamine-graphene quantum dots

Title
Ultrahigh current efficiency of light-emitting devices based on octadecylamine-graphene quantum dots
Author
김대훈
Keywords
Quantum dot; Graphene; Light-emitting device; Graphene quantum dot; Current efficiency
Issue Date
2017-01
Publisher
ELSEVIER SCIENCE BV
Citation
NANO ENERGY, v. 32, page. 441-447
Abstract
Graphene quantum dots (GQDs) have currently emerged as excellent candidates for applications in GQD-based LEDs because of their potential applications in next-generation multifunctional systems. However, the numerous oxygenous functional groups and defects existing in the GQDs restrict their florescence quantum yield, resulting in a decrease in the brightness of light-emitting devices (LEDs) based on GQDs. Here, we report on solution-processed and highly-efficient LEDs that have been developed based on octadecylamine (ODA)GQDs. In contrast with the GQDs, the number of oxygen components in the ODA-GQDs is lower due to nucleophilic substitution between the amine and the epoxy functional groups. The current and the external quantum efficiency of an LED with ODA-GQDs are 6.51 cd/A and 2.67%, respectively, this current efficiency of 6.51 cd/A being the highest among the efficiencies reported for LEDs based on GQDs. The efficiency enhancement in the LEDs with ODA-GQDs is attributed to significant improvements in the optical properties of the ODA-GQDs. The successful demonstration of this efficiency enhancement for LEDs based on ODA-GQDs indicates a potential for applications of GQD-based LEDs as next-generation real optical sources.
URI
https://www.sciencedirect.com/science/article/pii/S2211285517300022?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/112311
ISSN
2211-2855; 2211-3282
DOI
10.1016/j.nanoen.2017.01.002
Appears in Collections:
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION[S](산학협력단) > ETC
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