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

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

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.

Citation

Nam, S., Chaudhry, M. U., Tetzner, K., Pearson, C., Groves, C., Petty, M. C., Anthopoulos, T. D., & Bradley, D. D. (2019). Efficient and Stable Solution-Processed Organic Light Emitting Transistors using a High-k Dielectric. ACS Photonics, 6(12), 3159-3165. https://doi.org/10.1021/acsphotonics.9b01265

• Journal Article Type: Article
• Acceptance Date: Nov 12, 2019
• Online Publication Date: Nov 12, 2019
• Publication Date: Dec 18, 2019
• Deposit Date: Nov 13, 2019
• Publicly Available Date: Nov 12, 2020
• Journal: ACS Photonics
• Electronic ISSN: 2330-4022
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 12
• Pages: 3159-3165
• DOI: https://doi.org/10.1021/acsphotonics.9b01265
• Public URL: https://durham-repository.worktribe.com/output/1277686