Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany).
Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg (Germany).
Angew Chem Int Ed Engl. 2015 Nov 23;54(48):14545-8. doi: 10.1002/anie.201505141. Epub 2015 Oct 14.
Liquid-phase processing is a key prerequisite for the cost-efficient fabrication of organic electronic devices. We report an approach for light-induced modulation of the solubility of π-conjugated polymers (polyfluorene) with side chains functionalized with hydroxycinnamic acid. Irradiation with light cleaves the solubilizing side chains and renders the thin films of the polyfluorene insoluble. In a proof of concept device, polyfluorenes were applied as emissive layers in OLEDs. Photoirradiation of the emission layer leads to an increase in OLED performance combined with a modulation of the solubility of the thin film. These results offer the possibility for further development in terms of manipulating the solubility and emissive parameters of an important class of functional materials.
液相加工是实现有机电子器件成本效益制造的关键前提。我们报告了一种用光诱导调节带有羟基肉桂酸官能化侧链的π共轭聚合物（聚芴）溶解度的方法。用光照射会切断增溶侧链，使聚芴薄膜不溶。在概念验证器件中，聚芴被用作 OLED 的发射层。对发射层进行光辐照会导致 OLED 性能的提高，同时薄膜的溶解度也得到调节。这些结果为进一步开发重要功能材料的溶解度和发射参数提供了可能性。
