Park, Young Ran Jeong, Hu Young Seo, Young Soo Choi, Won Kook Hong, Young Joon 2024-01-20T01:34:14Z 2024-01-20T01:34:14Z 2021-09-01 2017-04-12 2045-2322 https://pubs.kist.re.kr/handle/201004/122850 Electroluminescence efficiency is crucial for the application of quantum-dot light-emitting diodes (QD-LEDs) in practical devices. We demonstrate that nitrogen-doped carbon nanodot (N-CD) interlayer improves electrical and luminescent properties of QD-LEDs. The N-CDs were prepared by solution-based bottom up synthesis and were inserted as a hole transport layer (HTL) between other multilayer HTL heterojunction and the red-QD layer. The QD-LEDs with N-CD interlayer represented superior electrical rectification and electroluminescent efficiency than those without the N-CD interlayer. The insertion of N-CD layer was found to provoke the Forster resonance energy transfer (FRET) from N-CD to QD layer, as confirmed by time-integrated and - resolved photoluminescence spectroscopy. Moreover, hole-only devices (HODs) with N-CD interlayer presented high hole transport capability, and ultraviolet photoelectron spectroscopy also revealed that the N-CD interlayer reduced the highest hole barrier height. Thus, more balanced carrier injection with sufficient hole carrier transport feasibly lead to the superior electrical and electroluminescent properties of the QD-LEDs with N-CD interlayer. We further studied effect of N-CD interlayer thickness on electrical and luminescent performances for high-brightness QD-LEDs. The ability of the N-CD interlayer to improve both the electrical and luminescent characteristics of the QD-LEDs would be readily exploited as an emerging photoactive material for high-efficiency optoelectronic devices. English NATURE PUBLISHING GROUP WORK FUNCTION DEEP-ULTRAVIOLET GRAPHENE PHOTOLUMINESCENCE MECHANISM ORIGIN GREEN NANOCRYSTALS PERFORMANCE EFFICIENCY Quantum-Dot Light-Emitting Diodes with Nitrogen-Doped Carbon Nanodot Hole Transport and Electronic Energy Transfer Layer Article 10.1038/srep46422 1 SCIENTIFIC REPORTS, v.7 SCIENTIFIC REPORTS 7 scie scopus 000398992700001 2-s2.0-85017409127 Multidisciplinary Sciences Science & Technology - Other Topics Article WORK FUNCTION DEEP-ULTRAVIOLET GRAPHENE PHOTOLUMINESCENCE MECHANISM ORIGIN GREEN NANOCRYSTALS PERFORMANCE EFFICIENCY QD LED N-doped C-Dot transport layer