Efficient solution-processed blue phosphorescent organic light-emitting diodes with halogen-free solvent to optimize the emissive layer morphology |
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| Affiliation: | 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu plentas 19, LT50254 Kaunas, Lithuania;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, People''s Republic of China;2. Department of Mechanical and Electronic Engineering, Liaoning Provincial College of Communications, 102 Shenbei Road, Shenbei New District, Shenyang 110122, People''s Republic of China;3. Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, UK;1. School of Optical and Electronic Information & Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China;2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA;1. Institute of Metal Research Chinese Academy of Sciences, Shenyang 110016, China;2. Alan G. MacDiarmid Lab College of Chemistry, Jilin University, Changchun 130023, China;1. Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ 08854, United States;2. MIT Building E25-406 77, Massachusetts Avenue, Cambridge, MA 02139, United States;3. Institute for Advanced Materials Devices and Nanotechnology, Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ 08854, United States;4. 3005 Hobson Way, Air Force Research Laboratory, Wright Patterson, OH 45433, United States |
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| Abstract: | Efficient solution-processed blue phosphorescent organic light-emitting diodes (OLEDs) featuring with halogen-free solvent processing are fabricated in this study. The organic molecule 3,6-bis(diphenylphosphoryl)-9-(4′-(diphenylphosphoryl) phenyl)-carbazole (TPCz) that possesses good solubility in halogen-free polar solvents is selected to serve as the host of blue phosphorescent iridium(III) [bis(4,6-difluorophenyl)-pyridinato-N,C2]-picolinate (FIrpic) dopant. The morphology of the TPCz:FIrpic emissive layer prepared with different polar solvents including chlorobenzene (CB), n-butanol (ButA) and isopropanol (IPA) and the effect on their electroluminescent performance have been investigated in detail. It is found that the more polar halogen-free solvent IPA restrains the FIrpic aggregation and renders a more densely packed emissive layer as compared to the CB-processed counterpart, which results in the enhanced electroluminescent performance. The luminous efficiency and power efficiency of the blue phosphorescent OLEDs prepared with CB are merely 5.7 cd/A and 3.3 lm/W, respectively. When using more polar halogen-free solvent IPA, the efficiencies are enhanced to 22.3 cd/A and 15.6 lm/W, about 2.9 and 3.7-time increment, respectively. This work provides an approach to fabricate efficient solution-processed phosphorescent OLEDs with environmental-friendly solvents, which is highly required in large-scale solution-processed manufacturing. |
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| Keywords: | Organic light-emitting diodes Solution process Halogen-free solvent Film morphology |
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