【摘 要】
：
Poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt(4,4\'-(N-(4-butylphenyl))](TFB),one of the most popular and widely used hole-transport layer(HTL) materials,has been successfully applied in high performance spin-coated quantum dots-based light-emitting diodes(Q
【机 构】
：
Printable Electronics Research Center,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy
论文部分内容阅读
Poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt(4,4\'-(N-(4-butylphenyl))](TFB),one of the most popular and widely used hole-transport layer(HTL) materials,has been successfully applied in high performance spin-coated quantum dots-based light-emitting diodes(QLEDs) due to its suitable energy level and high mobility.However,there are still many challenging issues in inkjet-printed QLED devices when using TFB as HTL.TFB normally suffers from the interlayer mixing and erosion,and low surface energy against the good film formation.Here,a novel environment-friendly binary solvent system was established for formulating quantum dot (QD)inks,which is based on mixing halogen-free alkane solvents of decalin and n-tridecane.The optimum volume ratio for the mixture of decalin and n-tridecane was found to be 7∶3,at which a stable ink jetting flow and coffee-ring free QD films could be formed.To research the influence of substrate surface on the formation of inkjet-printed QD films,TFB was annealed at different temperatures,and the optimum annealing temperature was found to enable high quality inkjet-printed QD film.Inkjet-printed red QLED was ultimately manufactured.A maximum 18.3％ of external quantum efficiency (EQE) was achieved,reaching 93％ of the spin-coated QLED,which is the best reported high efficiency inkjet-printed red QLEDs to date.In addition,the inkjet-printed QLED achieved similar T75 operational lifetime (27 h) as compared to the spin-coated reference QLED (28 h) at 2,000 cd·m-2.This work demonstrated that the novel orthogonal halogen-free alkane co-solvents can improve the interfacial contact and facilitate high-performance inkjet printing QLEDs with high EQE and stability.
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