Effect of host generation on the luminescent and charge transporting properties of solution processed OLEDs

M. Gao; J. Jang; T. Leitner; V.T.N. Mai; C.S.K. Ranasinghe; R. Chu; P.L. Burn; A. Pivrikas; P.E. Shaw

doi:10.1002/admi.202100820

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Effect of host generation on the luminescent and charge transporting properties of solution processed OLEDs

Journal article

Peer reviewed

Effect of host generation on the luminescent and charge transporting properties of solution processed OLEDs

M. Gao, J. Jang, T. Leitner, V.T.N. Mai, C.S.K. Ranasinghe, R. Chu, P.L. Burn, A. Pivrikas and P.E. Shaw

Advanced Materials Interfaces, Vol.8(20), 2100820

2021

DOI: https://doi.org/10.1002/admi.202100820

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Abstract

Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) is a commonly used host material for organic light-emitting diodes (OLEDs). TCTA has poor solubility and hence to improve solubility the authors have synthesized first- and second-generation TCTA-based dendrimers with n-propyl surface groups. These dendrimeric TCTA hosts have improved solubility and similar photophysical properties to TCTA. The hole mobility of solution-processed TCTA is found to be an order of magnitude less than films formed by evaporation and similar to that of the two dendronized TCTAs (mobilities in the order of 10−5 cm2 V−1 s−1). The hole mobility in the films is found to decrease when a green emissive first-generation light-emitting dendrimer is blended with the host materials due to charge trapping on the emissive guest. In the case of the second-generation host, there is evidence of a degree of phase separation in the film. Organic light-emitting diodes are fabricated at guest concentrations corresponding to the maximum observed photoluminescence quantum yield (PLQY) and lowest hole mobility. It is found that the external quantum efficiency (EQE) does not always scale with the PLQY, leading to devices that have EQEs higher than expected based on the PLQY and outcoupling of light from a bottom emitting device.

Details

Title: Effect of host generation on the luminescent and charge transporting properties of solution processed OLEDs
Authors/Creators: M. Gao (Author/Creator) - The University of Queensland
J. Jang (Author/Creator) - The University of Queensland
T. Leitner (Author/Creator) - The University of Queensland
V.T.N. Mai (Author/Creator) - The University of Queensland
C.S.K. Ranasinghe (Author/Creator) - The University of Queensland
R. Chu (Author/Creator) - The University of Queensland
P.L. Burn (Author/Creator) - The University of Queensland
A. Pivrikas (Author/Creator) - Murdoch University
P.E. Shaw (Author/Creator) - The University of Queensland
Publication Details: Advanced Materials Interfaces, Vol.8(20), 2100820
Publisher: Wiley
Identifiers: 991005543727407891
Copyright: © 2021 Wiley-VCH GmbH
Murdoch Affiliation: School of Mathematics, Statistics, Chemistry and Physics
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.114 Organic Semiconductors; 2.114.321 OLEDs
Web Of Science research areas: Chemistry, Multidisciplinary; Materials Science, Multidisciplinary
ESI research areas: Materials Science