Effective Suppression of Intra- and Interchain Triplet Energy Transfer to Polymer Backbone from the Attached Phosphor for Efficient Polymeric Electrophosphorescence
Effective Suppression of Intra- and Interchain Triplet Energy Transfer to Polymer Backbone from the Attached Phosphor for Efficient Polymeric Electrophosphorescence
复制标题
有效抑制链内和链间三重态能量从附着的荧光粉转移到聚合物骨架，以实现高效的聚合物电致磷光
DOI：
10.1021/cm9008305
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发表时间：
2009-07
影响因子：
8.6
通讯作者：
Qin, Jingui
中科院分区：
文献类型：
--
作者：
Cao, Yong;Yang, Chuluo;Zhang, Kai;Zou, Yang;Gong, Shaolong;Chen, Zhao;Qin, Jingui
为了系统地研究聚合物电致磷光与聚合物结构之间的关系，我们设计并合成了一系列以不同链构型嵌入聚合物主链上的发红光铱配合物[(piq)2Irdbm]（其中piq是1-苯基异喹啉，dbm是二苯甲酰甲烷）的共聚物。我们发现，从附着的荧光粉到聚合物主链的三重态能量反向转移不仅可以通过增强聚合物主链的三重态能量（ET）来抑制，而且可以通过在主链上引入空间位阻单元来抑制。与改进的电荷传输能力一起，可以实现高器件效率。由于具有相对较高的 ET (2.32 eV)，具有芴-alt-恶二唑主链的共聚物 PFOxdIrpiq3 的最大外量子效率为 2.93%，发射峰为 629 nm。在相同的器件配置下，具有芴-alt-spir的共聚物PFSFIRpiq3的效率进一步提高至3.21%...
To systematically investigate the relationship between polymeric electrophosphorescence and polymer structures, we designed and synthesized a series of copolymers with red-emitting iridium complex [(piq)2Irdbm] (where piq is 1-phenylisoquinolin and dbm is dibenzoylmethane) embedded onto the polymer backbone with different chain configurations. We found that triplet energy back transfer from an attached phosphor to polymer backbone can be suppressed not only by enhancing the triplet energy (ET) of polymer backbone, but also by introducing a sterically hindered units on the backbone. Together with the improved charge transporting ability, high device efficiency can be achieved. A maximum external quantum efficiency of 2.93% with an emission peak of 629 nm is attained from the copolymer PFOxdIrpiq3 with fluorene-alt-oxadiazole backbone due to its relative high ET (2.32 eV). The efficiency is further enhanced to 3.21% under the identical device configuration for the copolymer PFSFIrpiq3 with fluorene-alt-spir...