Benzodithienyl Silanes for Organic Electronics: AIE Solid-State Blue Emitters and High Triplet Energy Charge-Transport Materials
Benzodithienyl Silanes for Organic Electronics: AIE Solid-State Blue Emitters and High Triplet Energy Charge-Transport Materials
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DOI：
10.1002/adom.202001018
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发表时间：
2020-09-22
影响因子：
9
通讯作者：
Cauteruccio, Silvia
中科院分区：
文献类型：
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作者：
Bossi, Alberto;Arnaboldi, Serena;Cauteruccio, Silvia
合成了一类新型的苯并[1，2-B：4，3-B ']二噻吩基（BDT）硅烷1 - 3，其中一个四面体硅原子连接两个BDT单元，可作为高三重态能量的3D主体.这些结构的物理和电化学性质的研究，表明构成BDT单元的特有功能被保存在相应的硅烷。所有化合物均具有深紫外吸收（E-g = 4.10-3.52 eV）和荧光发射（1和2在300-400 nm，3在350-450 nm）。在低温下观察到磷光，T（1）态分别为2.65、2.59和2.25 eV。溶液中的发射效率高达0.18 in 3。化合物1以两种单斜结构结晶，没有相关的分子内-分子间接触;两者都显示出类似的和有趣的聚集诱导的发射样深蓝色发射（390-397 nm），量子产率高达13%。使用硅烷1作为基质材料实现了蓝色和绿色发射有机发光二极管器件。绿色Ir（ppy）（3）发射体的完美敏化导致器件在效率方面与标准器件很好地比较。蓝色FIrpic发射体反而由于太封闭的三重态而仅被部分敏化。
A novel class of benzo[1,2-b:4,3-b ']dithienyl (BDT) silanes1-3in which a tetrahedral silicon atom connects two BDT units is developed as high triplet energy 3D-host. The photophysical and electrochemical properties of these structures are investigated, demonstrating that the peculiar features of the constituting BDT units are preserved in the corresponding silanes. All compounds display deep UV absorption (E-g = 4.10-3.52 eV) and fluorescent emission (300-400 nm for1and2, and 350-450 nm for3). Phosphorescence is observed at low temperature and the respectiveT(1)states set at 2.65, 2.59, and 2.25 eV. Emission efficiency in solution is as high as 0.18 in3. Compound1crystallizes in two monoclinic structures without relevant intra-inter-molecular contacts; both display similar and intriguing aggregation induced emission-like deep blue emission (390-397 nm) with quantum yield up to 13%. A blue and a green emissive organic light emitting diode devices are realized using silane1as semiconductive host material. The perfect sensitization of the green Ir(ppy)(3)emitter results in a device which nicely compares, in terms of efficiency, with a standard one. The blue FIrpic emitter is instead only partially sensitized on account of the too closed triplets.