A new hole-blocking material, 2-(9,9′-spirobi[fluoren]-5-yl)-4-phenylbenzo [4,5]thieno[3,2-d]pyrimidine (SBF-BTPym), was designed and synthesized using spirobifluorene and electron transport moieties. The high triplet energy and high thermal stability of the spirobifluorene moiety were suitable for designing the hole-blocking material for blue fluorescent organic light-emitting diodes (OLEDs). The electron deficiency of benzothienopyrimidine allowed good electron transport properties, and a deep highest occupied molecular orbital energy level of −6.55 eV suppressed leakage of the holes from the emitting layer (EML) to the adjacent layer. Blue fluorescent OLEDs consisting of a triplet-triplet annihilation–induced host were fabricated using SBF-BTPym. The maximum external quantum efficiency of the blue fluorescent device was 7.2%, which was higher than that of the device without a hole-blocking layer by 10%. According to transient electroluminescence analysis, exciton confinement in the EML is mainly responsible for the improved efficiency.

设计了一种新型空穴阻挡材料 2-(9,9'-spirobi[fluoren]-5-yl)-4-phenylbenzo [4,5]thieno[3,2-d]pyrimidine ( SBF-BTPym )并使用螺二芴和电子传输部分合成。螺二芴部分的高三线态能量和高热稳定性适合设计用于蓝色荧光有机发光二极管 (OLED) 的空穴阻挡材料。苯并噻吩并嘧啶的电子缺陷使其具有良好的电子传输性能，-6.55 eV 的深最高占据分子轨道能级抑制了空穴从发光层 (EML) 泄漏到相邻层。使用SBF-BTPym制造由三重态-三重态湮灭诱导的主体组成的蓝色荧光 OLED. 蓝色荧光器件的最大外量子效率为7.2%，比没有空穴阻挡层的器件高出10%。根据瞬态电致发光分析，EML 中的激子限制是提高效率的主要原因。