AI 中文总结
研究针对溶液处理OLED多层堆叠中效率难题，采用PEDOT:PSS:PFI混合物作空穴注入层，解决空穴注入及层间溶剂问题，用于多种发光层，实现了不同发射器的高性能溶液处理TADF OLED，确立其为广泛兼容平台。
AI 中文摘要
溶液处理的OLED为大面积器件提供了可扩展的途径，但由于空穴注入困难以及层间溶剂正交性问题，在多层堆叠中实现具有竞争力的效率仍然是一个挑战。基于PEDOT:PSS和全氟离子聚合物（PFI）混合物的空穴注入层（HIL）同时解决了这两个挑战：PFI在膜干燥过程中的表面偏析形成了高功函数界面，改善了空穴注入到高电离势主体材料中，而混合物在芳香族溶剂中的不溶性防止了与后续沉积层的混合。使用这种HIL与溶液处理的mCPCN:SpiroAC-TRZ发光层，展示了峰值外量子效率（EQEmax）为21.7%、在100 cd m-2时外量子效率（EQE）为20.2%发光层，峰值亮度为29,000 cd m-2以及半高宽（FWHM）发射线宽为69 nm的天蓝色OLED。基于PFI的HIL方法扩展到了光化学稳定的TADF发射器5TCzBN（EQEmax 18.4%，FWHM 73 nm）以及包含多共振TADF终端发射器n-DABNA（EQEmax 22.8%，FWHM 26 nm）和树枝状大分子TCzBN-BMes（EQEmax 20.4%，FWHM 29 nm）的敏化/超荧光OLED。这些结果确立了PEDOT:PSS:PFI HIL作为高性能溶液处理TADF OLED的广泛兼容平台。
英文摘要
Solution-processed OLEDs offer a scalable route to large-area devices, but achieving competitive efficiency in multilayer stacks remains a challenge due to difficulties in hole injection as well as solvent orthogonality between layers. A hole injection layer (HIL) based on a blend of PEDOT:PSS and a perfluorinated ionomer (PFI) addresses both challenges simultaneously: surface segregation of PFI during film drying creates a high-work-function interface improving hole injection into high-ionisation potential host materials, while the insolubility of the blend in aromatic solvents prevents intermixing with subsequently deposited layers. Using this HIL with a solution-processed mCPCN:SpiroAC-TRZ emissive layer, sky-blue OLEDs with a peak external quantum efficiency (EQEmax) of 21.7%, an external quantum efficiency (EQE) of 20.2% at 100 cd m-2, a peak luminance of 29,000 cd m-2 and a full width at half maximum (FWHM) emission linewidth of 69 nm are demonstrated. The PFI-based HIL approach is extended to the photochemically stable TADF emitter 5TCzBN (EQEmax 18.4%, FWHM 73 nm) and to sensitized / hyperfluorescent OLEDs incorporating the multi-resonance TADF terminal emitters n-DABNA (EQEmax 22.8%, FWHM 26 nm) and the dendrimer TCzBN-BMes (EQEmax 20.4%, FWHM 29 nm). These results establish the PEDOT:PSS:PFI HIL as a broadly compatible platform for high-performance solution-processed TADF OLEDs.
