Modulation of ambipolar charge transport characteristics in side-chain polystyrenes as host materials for solution processed OLEDs |
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| Affiliation: | 1. Department of Chemistry, Khwaja Fareed University of Engineering & Information Technology, Rahim Yar Khan, 64200, Pakistan;2. Department of Chemistry, University of Malakand, Chakdara, 18800, Lower Dir, Khyber Pakhtunkhwa, Pakistan;3. Department of Chemistry, University of Sargodha, 40100, Pakistan;4. Department of Chemistry, University of Okara, Okara-56300, Pakistan;5. Department of Applied Chemistry, Government College University, Faisalabad-38000, Pakistan;6. Department of Physics, University of Sargodha, Sargodha, Pakistan;7. Instituto de Química de Sao Carlos, Universidade de Sao Paulo, CEP 13560-970, Sao Carlos, SP, Brazil;8. Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Avenida Professor LineuPrestes, 748, São Paulo 05508-000, Brazil |
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| Abstract: | A series of side-chain polystyrenes was developed as ambipolar hosts for solution processed organic light emitting diodes (OLEDs). The series was derived from the hole-only transport host molecule 1,3-Bis(N-carbazolyl)benzene (mCP). Electron transport ability was incorporated into the host polymers by the introduction of electron-poor heterocycles (pyridine or triazine) and extending delocalization of the lowest unoccupied molecular orbital (LUMO). The materials were tested in Ir-based green OLED devices with all organic layers processed from solution. Devices with the polymer combining triazine and carbazole on its side-chain exhibited a low luminance on-set voltage of 3.0 V and a current efficacy of 28.9 cd/A, which was more than 10 times higher than for devices with the mCP-based polymer (1.6 cd/A). The increase in performance is most likely due to an improvement of charge balance in the emissive layer, showing that our ambipolar polymers are good candidates for further wet-process optoelectronic applications. |
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| Keywords: | Polymer OLED Ambipolar host Solution-processing Charge transport |
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