Coumarin-cored carbazole dendrimers as solution-processed non-doped green emitters for electroluminescent devices |
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Authors: | Narid Prachumrak Sirintra Potjanasopa Rattanawalee Rattanawan Supawadee Namuangruk Siriporn Jungsuttiwong Tinnagon Keawin Taweesak Sudyoadsuk Vinich Promarak |
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Affiliation: | 1. School of Chemistry and Center of Excellence for Innovation in Chemistry, Institute of Science, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand;2. Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand;3. National Nanotechnology Center, 130 Thailand Science Park, Klong Luang, Pathumthani 12120, Thailand;4. PTT Group Frontier Research Center, PTT Public Company Limited, 555 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand |
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Abstract: | A series of green-emitting thiophenyl coumarin-cored carbazole dendrimers containing carbazole dendrons up to the third generation as substituent were synthesized and characterization. Their optical, thermal, electrochemical, and electroluminescent properties as non-doped solution-processed light-emitters for OLEDs were investigated. By incorporating carbazole dendrons in the molecule, we are able to reduce the crystallization and retain the high emissive ability of a planar thiophenyl coumarin fluorescent core in the solid state as well as improve the thermal stability of the material. These dendrimers showed a bright-green fluorescence and can form morphologically stable amorphous thin films with glass-transition temperatures as high as 285 °C. Simple structured solution-processed OLEDs using these materials as hole-transporting non-doped emitters and BCP as a buffer layer emit a stable green electroluminescence (λEL=502–526 nm) with high luminance efficiencies (up to 7.92 cd/A at 7.39 mA/cm2) and high green color purity (CIE=0.26, 0.62, which are close to the pure green color). |
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Keywords: | Coumarin Carbazole Dendrimer Non-doped green emitter Organic light-emitting diode |
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