Speaker
Description
Optoelectronic devices' progress is driven by the development of new donor-acceptor (D-A) systems. The number of possible combinations of donor and acceptor building blocks allows the design of compounds with desired properties. Previous studies show that the phenothiazine molecule is an extremely valuable electron-donor (D) unit due to the presence of electron-rich sulfur and nitrogen heteroatoms. Therefore, systems containing a phenothiazine motif are widely used to design new materials dedicated to organic electronics' needs, including active layers in organic light-emitting diodes (OLEDs) [1,2].
A new series of A/D-π-D-A architecture N-octylphenothiazine malononitriles containing p-methoxyphenyl, p-trifluoromethylphenyl, 3,5-bis(trifluoromethyl)phenyl, or p-cyanophenyl substituents (P1-P4) were designed, synthesized and characterized by NMR and mass spectroscopy, and elemental analyses. Photophysical, thermal, and electrical properties of P1-P4 were investigated with studied of end-capped groups impact. The novel dyes hold high thermal stability, an intramolecular charge transfer absorption band at about 480 nm and broad emission with a maximum around 620 nm in solution and 670 nm in the solid-state. Compound P4 with cyanophenyl substituent seems to be the most promising material for OLED devices among new compounds. Overall, the obtained results provide an excellent study of the substituents' effect on properties important for organic electronics applications.
This study is supported by POWR.03.02.00-00-I010/17 and the National Science Centre of Poland Grant No. 2016/23/B/ST8/02045 and PW-2004-105.
References:
1. Slodek A, Zych D, Golba S, Zimosz S, Gnida P, Schab-Balcerzak E. J. Mater. Chem. C 2019;7:5830.
2. Shi J, Xu L, Chen C, Lv X, Ding Q, Li W, Xue S, Yang W, Dyes and Pigments 2019;160:962.
| Speaker Country | Poland |
|---|