Loading...
Please wait, while we are loading the content...
Similar Documents
Deep-Red and Near-Infrared Iridium Complexes with Fine-Tuned Emission Colors by Adjusting Trifluoromethyl Substitution on Cyclometalated Ligands Combined with Matched Ancillary Ligands for Highly Efficient Phosphorescent Organic Light-Emitting Diodes
| Content Provider | MDPI |
|---|---|
| Author | Chen, Shuonan Bi, Hai Tian, Wenjing Liu, Yu |
| Copyright Year | 2022 |
| Description | Six novel $Ir(C^N)_{2}$(L^X)-type heteroleptic iridium complexes with deep-red and near-infrared region (NIR)-emitting coverage were constructed through the cross matching of various cyclometalating (C^N) and ancillary (LX) ligands. Here, three novel C^N ligands were designed by introducing the electron-withdrawing group $CF_{3}$ on the ortho (o-), meta (m-), and para (p-) positions of the phenyl ring in the 1-phenylisoquinoline (piq) group, which were combined with two electron-rich LX ligands (dipba and dipg), respectively, leading to subsequent iridium complexes with gradually changing emission colors from deep red (≈660 nm) to NIR (≈700 nm). Moreover, a series of phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated by employing these phosphors as dopant emitters with two doping concentrations, 5% and 10%, respectively. They exhibited efficient electroluminescence (EL) with significantly high EQE values: >15.0% for deep red light0 $(λ_{max}$ = 664 nm) and >4.0% for NIR cases $(λ_{max}$ = 704 nm) at a high luminance level of 100 cd $m^{−2}$. This work not only provides a promising approach for finely tuning the emission color of red phosphors via the easily accessible molecular design strategy, but also enables the establishment of an effective method for enriching phosphorescent-emitting molecules for practical applications, especially in the deep-red and near-infrared region (NIR). |
| Starting Page | 286 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules27010286 |
| Journal | Molecules |
| Issue Number | 1 |
| Volume Number | 27 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-01-04 |
| Access Restriction | Open |
| Subject Keyword | Molecules Inorganic Chemistry Deep-red and Near-infrared Iridium Complexes Phosphorescent Organic Light-emitting Diodes (oleds) |
| Content Type | Text |
| Resource Type | Article |
