Efficient and Stable Solution-Processed Organic Light Emitting Transistors using a High-k Dielectric

Sungho Nam, Mujeeb Ullah Chaudhry, Kornelius Tetzner, Christopher Pearson, Chris Groves, Michael C. Petty, Thomas D. Anthopoulos, Donal Bradley

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report the development of highly efficient and stable solution-processed organic light emitting transistors (OLETs) that combine a polymer heterostructure with the transparent high-k dielectric poly(vinylidenefluoride0.62-trifluoroethylene0.31-chlorotrifluoroethylene0.7) (P(VDF-TrFE-CTFE)). The polymer heterostructure comprises of the poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b’]dithiophen-2-yl)-alt-[1,2,5]thiadiazolo[3,4-c]pyridine] (PCDTPT) and Super Yellow as charge transporting and light emitting layers, respectively. Device characterization shows that the use of P(VDF-TrFE-CTFE) leads to larger channel currents (≈2 mA) and lower operating voltages (-35 V) than for previously reported polymer based OLETs. Furthermore, the combined transparency of the dielectric and gate electrode, results in efficient bottom emission with external quantum efficiency of ≈0.88 % at a luminance L ≥ 2000 cd m−2. Importantly, the resulting OLETs exhibit excellent shelf life and operational stability. The present work represents a significant step forward in the pursuit of all-solution-processed OLET technology for lighting and display applications.
Original languageEnglish (US)
Pages (from-to)3159-3165
Number of pages7
JournalACS Photonics
Volume6
Issue number12
DOIs
StatePublished - Nov 12 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: SN and DDCB thank the University of Oxford for postdoctoral research fellowship funding together with laboratory infrastructure and other research support. MUC acknowledges provision of a starting grant from Durham University and travel and subsistence support from
the University of Oxford. KT and TDA further thank the European Union Horizon 2020 People Programme (Marie Curie Actions grant N°658563, ‘‘Flexible Complementary Hybrid Integrated Circuits’’ (FlexCHIC)), and the King Abdullah University of Science and
Technology (KAUST) for financial support.

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