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Durham University

Research & business

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Publication details for Dr Chris Groves

Nam, Sungho, Chaudhry, Mujeeb Ullah, Tetzner, Kornelius, Pearson, Christopher, Groves, Chris, Petty, Michael C., Anthopoulos, Thomas D. & Bradley, Donal D.C. (2019). Efficient and Stable Solution-Processed Organic Light Emitting Transistors using a High-k Dielectric. ACS Photonics 6(12): 3159-3165.

Author(s) from Durham

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.