Hole-transporting side-chain polystyrenes based on TCTA with tuned glass transition and optimized electronic properties
Hole-transporting side-chain polystyrenes based on TCTA with tuned glass transition and optimized electronic properties
复制标题
DOI：
10.1039/c5ra12963j
复制
发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
Felix R. P. Limberg;A. Miasojedovas;P. Pingel;Felix Reisbeck;S. Janietz;A. Monkman;H. Krüger
中科院分区：
文献类型：
--
作者：
Felix R. P. Limberg;A. Miasojedovas;P. Pingel;Felix Reisbeck;S. Janietz;A. Monkman;H. Krüger
用于制造可溶液加工的OLED的可交联材料的开发提出了挑战，特别是关于玻璃化转变（Tg）的调节，其对交联动力学和器件寿命具有显著影响。提出了基于聚（N，N-双（4-（9 H-咔唑-9-基）苯基）-4-乙烯基苯胺）（聚-TCTA）的交叉空穴传输材料，其具有用于Tg控制的共价连接的增塑剂和用于叠氮化物-炔交联的叠氮化物官能团。这些聚合物具有约150 °C的最佳Tg，并显示出优异的上级交联性能和溶液相容性。将推电子的醇盐引入侧基，结合了Tg调节方法和HOMO能级从−5.7到−5.3 eV的系统调谐。所有呈现的聚合物具有良好的电荷传输和注入性质，并且由于它们的高三重态能量（> 2.8eV）而对于磷光OLED中的应用是理想的。新型可交联聚TCTA基材料可用作完全溶液加工OLED中的空穴传输层（HTL）。对于具有额外交联HTL的OLED，证明了器件性能的改善。
The development of crosslinkable materials for the fabrication of solution processable OLEDs presents challenges, especially regarding the adjustment of the glass transition (Tg), which has a significant influence on crosslinking kinetics and device life-time. Crosslinkable hole transport materials based on poly(N,N-bis(4-(9H-carbazol-9-yl)phenyl)-4-vinylaniline) (poly-TCTA) with covalently attached plasticizers for Tg control and azide functionalities for azide-alkyne crosslinking are presented. These polymers have an optimal Tg of around 150 °C and show superior crosslinking performances and solution resistibilities. Incorporation of electron-pushing alkoxides to the pendant groups combines the Tg adjustment approach with a systematic tuning of the HOMO level from −5.7 to −5.3 eV. All presented polymers have good charge transport and injection properties and are ideal for applications in phosphorescent OLEDs due to their high triplet energies (>2.8 eV). The new crosslinkable poly-TCTA-based materials are applied as hole-transport layers (HTLs) in fully solution-processed OLEDs. An improvement of the device performance is demonstrated for OLEDs with additional crosslinked HTL.