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., …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