A novel intramolecular charge transfer blue fluorophor for high color stability hybrid di-chromatic white organic light-emitting diodes |
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| Affiliation: | 1. Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan, 030024, China;2. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, China;3. Department of Physics, Institute of Advanced Materials, and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University, Kowloon Tong, NT, Hong Kong, China;4. School of Physical Science and Electronics, Shanxi Datong University, Datong, 037009, China;5. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China;1. School of Material Science and Engineering, Central South University, Changsha 410083, PR China;2. Institute of Super-microstructure and Ultrafast Process in Advanced Materials, School of Physics and Electronics, Central South University, Changsha 410083, China;3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA;1. Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan;2. Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 97401, Taiwan;1. Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, United States;2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27607, United States;1. Department of Physics, Ajou University, Suwon 443-749, South Korea;2. Department of Energy Systems Research, Ajou University, Suwon 443-749, South Korea |
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| Abstract: | A novel intramolecular charge transfer (ICT) based blue fluorophor, 5,11-di(40-dimesitylboronphenyl)indolo[3,2-b]carbazole(DDBICZ), possessing a high fluorescent quantum yield of 0.52, a high triplet energy level (2.59 eV), and an intriguing bipolar charge transporting ability, was used as a highly efficient blue fluorophor and a host for a yellow phosphor. Doping a yellow phosphor(bis(2-(3-trifluoromethyl-4-fluorophenyl)-4-methylquinolyl)(acetyl-acetonate)iridium(III) (Ir(ffpmq)2(acac)) in the host DDBICZ, a simplified fluorescence/phosphorescence (F/P)-based hybrid white organic light-emitting diode (WOLED) with a symmetrical BYB-EML of DDBICZ (10 nm)/DDBICZ: 6 wt% Ir(ffpmq)2(acac) (10 nm)/DDBICZ (10 nm) is demonstrated. The hybrid WOLED exhibits excellent high color stability and good color quality. Under wide operating voltage range from 5 V to 10 V, the Commission Internationale de L'Eclairage (CIE) coordinates of the hybrid WOLED only change from (0.35, 0.36) to (0.34, 0.35), with a high color rending index (CRI) of 79–81. The high color stability is due to the fact that the BYB-EML effectively offsets the change of emission intensity from different emitters caused by the shift of carrier recombination zone with the increase of voltage. In addition, the hybrid WOLED also reveals a considerable current efficiency of 24.4 cd/A. These results demonstrate that efficient F/P hybrid WOLEDs with high color stability could be achieved by such simple BYB-EML structure using single-dopant strategy. |
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| Keywords: | Blue fluorophor ICT Hybrid WOLEDs Single-dopant Color stability |
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