Journal
DYES AND PIGMENTS
Volume 140, Issue -, Pages 14-21Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.01.010
Keywords
OLEDs; TADF; GIXD; Horizontal orientation; Delta E-ST; Phenyl linker
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016R1C1B1011745]
- Ministry of Science, ICT and Planning of South Korea under the IT Consilience Creative Program [IITP-2015-R0346-15-1007]
- NRF [2015R1A2A1A10055620]
- R&D program of MOTIE/KEIT [10048317]
- National Research Foundation of Korea [2016R1C1B1011745] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To increase the efficiency of blue organic light-emitting diodes (OLEDs), new blue dopants, 2-(bis(4-(diphenylamino)phenyl)methylene)malononitrile (4-DPM) and 2-(bis(3-(diphenylamino)phenyl) methylene)malononitrile (3-DPM), with thermally activated delayed fluorescence were synthesized. 4-DPM with a p-phenyl linker between the electron-donating diphenylamine unit and the electron withdrawing malonitrile unit showed a large overlap in the phenyl linker as well as the malonitrile unit, while 3-DPM with an m-phenyl linker showed a weak overlap in the phenyl linker. The OLED with the 3-DPM dopant showed higher efficiencies of 12.62 cd/A and 8.81 lm/W compared to that with the 4-DPM dopant (1.38 cd/A and 0.70 Im/W). This result was attributed to the small overlap between the electron-donating and electron-withdrawing units, the small charge-transfer singlet-triplet state splitting below 0.1 eV, and the well-aligned structure in the horizontal direction, as determined by grazing incidence X-ray diffraction. (C) 2017 Elsevier Ltd. All rights reserved.
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