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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3286
Title: Enabling a 6.5% External Quantum Efficiency Deep-Blue Organic Light-Emitting Diode with a Solution-Processable Carbazole-Based Emitter
Authors: Jou J.-H.
Li J.-L.
Sahoo S.
Dubey D.K.
Kumar Yadav R.A.
Joseph V.
Justin Thomas, K. R.
Wang C.-W.
Jayakumar J.
Cheng C.-H.
Published in: Journal of Physical Chemistry C
Abstract: Highly efficient deep-blue emission is crucial to realize energy-efficient and high-quality display and solid-state lighting applications. A solution-processable deep-blue emitter is essential for producing cost-effective large-area devices via roll-to-roll fabrication. Here, we demonstrate a highly efficient solution-processable deep-blue organic light-emitting diode by utilizing a carbazole-based fluorescent emitter 6-((9,9-dibutyl-7-((7-cyano-9-(2-ethylhexyl)-9H-carbazol-2-yl)ethynyl)-9H-fluoren-2-yl)ethynyl)-9-(2-ethylhexyl)-9H-carbazole-2-carbonitrile (JV55). The resultant device showed a maximum external quantum efficiency (EQE) of 6.5% and an EQE of 5.5% at 100 cd/m2 with CIE coordinates of (0.16, 0.06). The optimized device showed a maximum EQE of 6.5%. Additionally, the deep-blue emission also realized a 101% color saturation according to the NTSC standard. The high efficiency may be attributed to engineering appropriate device architecture and enabling balanced carrier injection, effective host-to-guest energy transfer, the emissive layer having a very high quantum yield of 91%, utilizing a host with high triplet energy so as to confine exciton on the guest, and low doping concentration inhibiting efficiency roll-off due to concentration quenching. © 2018 American Chemical Society.
Citation: Journal of Physical Chemistry C (2018), 122(42): 24295-24303
URI: https://doi.org/10.1021/acs.jpcc.8b07641
http://repository.iitr.ac.in/handle/123456789/3286
Issue Date: 2018
Publisher: American Chemical Society
ISSN: 19327447
Author Scopus IDs: 35083609400
57204290695
56982461100
57193009616
57203005559
57198421158
57203389297
7501627398
54881791600
35200532800
Author Affiliations: Jou, J.-H., Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Li, J.-L., Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Sahoo, S., Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Dubey, D.K., Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Kumar Yadav, R.A., Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Joseph, V., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Wang, C.-W., Graduate Institute of Opto-Mechatronics, National Chung Cheng University, Chiayi, 62102, Taiwan
Jayakumar, J., Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan
Cheng, C.-H., Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan
Funding Details: The authors would like to acknowledge the support from the Ministry of Science and Technology (MOST), Taiwan. This work was financially supported by MOST through grant number 106-2119-M-007-011-.
Corresponding Author: Jou, J.-H.; Department of Materials Science and Engineering, National Tsing Hua UniversityTaiwan; email: jjou@mx.nthu.edu.tw
Appears in Collections:Journal Publications [CY]

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