Through-Space Charge-Transfer Polynorbornenes with Fixed and Controllable Spatial Alignment of Donor and Acceptor for High-Efficiency Blue Thermally Activated Delayed Fluorescence
Through-Space Charge-Transfer Polynorbornenes with Fixed and Controllable Spatial Alignment of Donor and Acceptor for High-Efficiency Blue Thermally Activated Delayed Fluorescence
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DOI：
10.1002/anie.202008912
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发表时间：
2020-08-28
影响因子：
16.6
通讯作者：
Wang, Fosong
中科院分区：
文献类型：
--
作者：
Li, Qiang;Hu, Jun;Wang, Fosong
为了实现高效的蓝色热激活延迟荧光(TADF)，开发了边对面/面对面堆积模式中施主和受主空间排列固定和可控的穿透空间电荷转移聚降冰片。通过使用降冰片烯的顺、外构型将供体和受体限制在接近的位置，并利用供体的正交和树枝结构提供相对于受体的垂直或平行堆积基序，实现了对齐。与边对面相对应的聚降冰片烯相比，具有面对面排列的给体和受体的聚降冰片具有更大的振子强度和更高的光致发光量子产率。得到的聚合物具有深蓝(422 Nm)到天蓝(482 Nm)的发射和TADF效应，反向系间交叉速率为0.4-5.9×10(6)S(-1)，对于溶液法制备的非掺杂蓝色有机电致发光二极管，其最大外量子效率为18.8%。
Through-space charge transfer polynorbornenes with fixed and controllable spatial alignment of donor and acceptor in edge-to-face/face-to-face stacking patterns are developed for achieving high-efficiency blue thermally activated delayed fluorescence (TADF). The alignment is realized by using the cis, exo-configuration of norbornene to confine donor and acceptor in close proximity, and utilizing orthogonal and dendritic structures of donors to provide either perpendicular or parallel stacking motif relative to acceptors. Compared to edge-to-face counterparts, polynorbornenes with face-to-face aligned donor and acceptor exhibit much larger oscillator strength and higher photoluminescence quantum yield. The resulting polymers exhibit deep blue (422 nm) to sky blue (482 nm) emission and TADF effect with reverse intersystem crossing rates of 0.4-5.9x10(6) s(-1), giving the maximum external quantum efficiency of 18.8 % for non-doped blue organic light-emitting diodes by solution process.