Carbazole/triphenylamine-cyanobenzimidazole hybrid bipolar host materials for green phosphorescent organic light-emitting diodes
| Autor: | Shian-Sung Chiou, Yen-Chia Cheng, Bhausaheb N. Patil, Chih-Hao Chang, Yogesh Jadhav, Yi-Fan Lin, Atul C. Chaskar, Prabhakar Chetti, Jatin J. Lade |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Dopant business.industry Carbazole General Chemistry Condensed Matter Physics Electrochemistry Triphenylamine Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Materials Chemistry OLED Moiety Optoelectronics Electrical and Electronic Engineering business Phosphorescence Common emitter |
| Zdroj: | Organic Electronics. 92:106090 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2021.106090 |
| Popis: | With a view to attain balanced charge flux for higher device performance of PhOLEDs, we have used carbazole/triphenyl amine as hole transporting moiety and cyano along with benzimidazole as electron transporting core in 3-Cbz-ImdCN, 4-Cbz-ImdCN and TPA-ImdCN. Their thermal, photophysical and electrochemical properties have been evaluated to shed light on structure-property-performance relationship. Good performances have been exhibited by these bipolar host materials in green PhOLEDs with maximum external quantum efficiencies were observed in the range of 5.3–11.5% using Ir(ppy)3 emitter. Further, 3-Cbz-ImdCN hosted orange and red PhOLEDs with the Ir(MDQ)2acac and Ir(piq)2acac emitters revealed the external quantum efficiencies of 5.1% and 6.3%, respectively. In all the devices pure emission was observed from dopants only which clearly implies that the devices possess effective energy transfer from the host to the guest. |
| Databáze: | OpenAIRE |
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