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

                                                                              ——高效穩(wěn)定的解決方案-使用高介電常數(shù)的有機發(fā)光晶體管

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

ACS Photonics (2019)

https://doi.org/10.1021/acsphotonics.9b01265

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 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.