Thermally cross-linkable host materials for enabling solution-processed multilayer stacks in organic light-emitting devices
Thermally cross-linkable host materials for enabling solution-processed multilayer stacks in organic light-emitting devices
复制标题
DOI：
10.1016/j.orgel.2013.03.028
复制
发表时间：
2013-06
影响因子：
3.2
通讯作者：
Naoya Aizawa;Yong‐Jin Pu;Hisahiro Sasabe;J. Kido
中科院分区：
文献类型：
--
作者：
Naoya Aizawa;Yong‐Jin Pu;Hisahiro Sasabe;J. Kido
一种可热交联的主体材料，即两个含有咔唑衍生物的乙烯基苄基醚基团（DV-CBP），被开发用于溶液加工的多层有机发光器件（OLED）。 DV-CBP 在不存在聚合引发剂的情况下在约 180°C 下固化，在苯乙烯端基处热交联。这种交联反应使发射层不溶，并能够随后进行上部电子传输层的溶液沉积。此外，在整个交联反应过程中，发射层的光致发光量子效率保持在大于75%。与发射层上真空沉积 Ca 电极的器件相比，交联发射层顶部的溶液处理小分子电子传输层可降低 OLED 的驱动电压并提高效率。
A thermally cross-linkable host material, i.e., two vinylbenzyl ether groups containing a carbazole derivative (DV-CBP), was developed for solution-processed multilayer organic light-emitting devices (OLEDs). DV-CBP was thermally cross-linked at styrene end-groups through curing at approximately 180°C in the absence of a polymerization initiator. This cross-linking reaction rendered the emissive layer insoluble and enabled the subsequent solution deposition of an upper electron-transporting layer. Furthermore, photoluminescence quantum efficiencies of the emissive layer were maintained at greater than 75% throughout the cross-linking reaction. A solution-processed small-molecule electron-transporting layer on top of the cross-linked emissive layer led to lower driving voltages and higher efficiencies in the OLEDs compared to those of a device with a vacuum-deposited Ca electrode on the emissive layer.