A versatile hybrid polyphenylsilane host for highly efficient solution-processed blue and deep blue electrophosphorescence
A versatile hybrid polyphenylsilane host for highly efficient solution-processed blue and deep blue electrophosphorescence
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一种多功能杂化聚苯基硅烷主体，用于高效溶液处理的蓝色和深蓝色电致磷光
DOI：
10.1039/c4tc01467g
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发表时间：
2014-10-21
影响因子：
6.4
通讯作者：
Yan, Shouke
中科院分区：
文献类型：
--
作者：
Sun, Dianming;Zhou, Xiaokang;Yan, Shouke
通过在聚四苯基硅烷主链上引入给电子基团咔唑，设计并合成了一种通用的蓝色和深蓝色荧光粉杂化聚合物基质（PCzSiPh）。聚合物PCzSiPh（4）由于四苯基硅烷骨架中硅原子的四面体几何形状而具有宽带隙和高三重态能量（ET）。良好的溶解度，结合高的热稳定性和形态稳定性的独特的物理性质，通过溶液处理得到非晶和均匀的PCzSiPh膜。因此，使用PCzSiPh作为主体与客体铱络合物TMP-FIrpic得到蓝色磷光有机发光二极管（PhOLED），其总体性能远远超过具有聚（乙烯基咔唑）（PVK）主体的对照器件。值得注意的是，基于FIrpic的器件表现出14.3%（29.3 cd A-1，10.4 lm W-1）的最大外部量子效率（EQE），这与使用聚合物主体作为蓝色掺杂剂发射体的现有技术文献数据相当。此外，PCzSiPh的多功能性扩展到使用FIr 6和FCNIrpic作为掺杂剂的深蓝色PhOLED，效率分别为11.3 cd A−1和8.6 cd A−1。
A universal hybrid polymeric host (PCzSiPh) for blue and deep blue phosphors has been designed and synthesized by incorporating electron-donating carbazole as pendants on a polytetraphenylsilane main chain. The polymer PCzSiPh (4) has a wide bandgap and high triplet energy (ET) because of the tetrahedral geometry of the silicon atom in the tetraphenylsilane backbone. The distinct physical properties of good solubility, combined with high thermal and morphological stability give amorphous and homogenous PCzSiPh films by solution processing. As a result, using PCzSiPh as host with the guest iridium complex TMP-FIrpic gives blue phosphorescent organic light-emitting diodes (PhOLEDs) with overall performance which far exceeds that of a control device with poly(vinylcarbazole) (PVK) host. Notably, FIrpic-based devices exhibit a maximum external quantum efficiency (EQE) of 14.3% (29.3 cd A−1, 10.4 lm W−1) which are comparable to state-of-the-art literature data using polymer hosts for a blue dopant emitter. Moreover, the versatility of PCzSiPh extends to deep blue PhOLEDs using FIr6 and FCNIrpic as dopants, with high efficiencies of 11.3 cd A−1 and 8.6 cd A−1, respectively.