Nemati Bideh Babak, Shahroosvand Hashem, Nazeeruddin Mohammad Khaja
Group for Molecular Engineering of Advanced Functional Materials (GMA), Chemistry Department, University of Zanjan, Zanjan 45371-38791, Iran.
Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1951 Sion, Switzerland.
Inorg Chem. 2021 Aug 16;60(16):11915-11922. doi: 10.1021/acs.inorgchem.1c00852. Epub 2021 Jul 29.
Turn-on time is a key factor for lighting devices to be of practical application. To decrease the turn-on time value of a deep-red light-emitting electrochemical cells (DR-LECs), two novel approaches based on molecularly engineered ruthenium phenanthroimidazole complexes were introduced. First, we found that with the incorporation of ionic methylpyridinium group to phenanthroimidazole ligand, the turn-on time of the DR-LECs device was dramatically reduced, from 79 to 27 s. By complexation of ruthenium emitter with Ag, the turn-on time was improved by 85%, and the EQE of DR-device was increased from 0.62 to 0.71%. These results open a new avenue in decreasing the turn-on time without adding ionic electrolytes, leading to an efficient LEC.
开启时间是照明设备实际应用的关键因素。为了降低深红色发光电化学电池（DR-LEC）的开启时间值，引入了两种基于分子工程化钌菲咯咪唑配合物的新方法。首先，我们发现，在菲咯咪唑配体中引入离子型甲基吡啶鎓基团后，DR-LEC器件的开启时间显著缩短，从79秒降至27秒。通过将钌发光体与银络合，开启时间提高了85%，DR器件的外量子效率从0.62%提高到0.71%。这些结果为在不添加离子电解质的情况下缩短开启时间开辟了一条新途径，从而得到高效的LEC。
