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芴基电致蓝光材料低能绿光带(LEEB)的起源仍没有结论,其中芴酮诱导LEEB是重要机制之一,基于此我们提出通过引入含抗氧化的受阻胺来抑制LEEB的策略.通过复杂二芳基芴(CDAF)方式构建了一个共价键联接的含四甲基哌啶(TMP)的蓝光三聚芴有机半导体材料DF-PTMPF,并通过退火实验研究对其光谱稳定性的影响.研究结果表明DF-PTMPF的光谱稳定性有了很大提高,退火120h时的绿光指数φ为1.4(φ=IGreen/IBlue),而相同条件下的三聚芴TDHF的绿光指数φ为2.4.同时,由于受阻胺可以除掉体系中微量的氧,而DF-PTMPF在起初的氮气气氛下退火24h仍产生绿光带,这一结果暗示了聚集诱导LEEB仍不能忽视.
Fluorescent-based blue light-emitting materials, low energy green band (LEEB) of the origin is still not concluded, of which fluorenone induced LEEB is one of the important mechanisms, based on which we proposed through the introduction of antioxidative hindered amine to inhibit LEEB strategy. A covalently bonded DFMPT-containing blue photopolymerization trifluorene DF-PTMPF was constructed by diarylfluorene (CDAF) and its effect on the spectral stability was studied by annealing experiments. The results show that the spectral stability of DF-PTMPF has been greatly improved. The green index φ of the DF-PTMPF is 1.4 (φ = IGreen / IBlue) after 120h annealing, while the green index of the trifluorene TDHF under the same conditions is 2.4 At the same time, trace amount of oxygen in the system can be removed due to the hindered amine, while green light band was produced after DF-PTMPF was annealed for 24 h in the initial nitrogen atmosphere. This result suggests that aggregation induced LEEB can not be neglected.