Modification of poly(vinyl alcohol) (PVA) by esterification is one of alternative ways to prepare copolymers. The degree of esterification on PVA was determined by FTIR, 1H-NMR, and elemental analysis. Both polymers, i.e., PVA and esterified PVA were mixed with carbon black in DMSO and prepared as thin films onto the interdigited electrodes (IDE) by spin-coating technique to obtain chemical sensors. To investigate the chemical vapour sensing property, the chemical sensors were examined with various organic solvents such as hexane, toluene, alcohols, THF, ethyl acetate, etc.
The charged iridium(III) complex polymers based on 1,10-phenanthroline in the polyfluorene backbones were synthesized by Suzuki-polycondensation. PFIr01, PFIr03, PFIr05, PFIr07 and PFIr10 were obtained by varying the content of iridium(III) unit in the polymer from 0.01, 0.03, 0.05, 0.07 and 0.10 mol%, respectively. The molecular structures of polymers were characterized by1H NMR,13C NMR and gel permeation chromatography. Their thermal, photophysical and electrochemical properties were investigated by thermal gravimetric analysis, UV-Visible spectroscopy, fluorescence spectroscopy and cyclic voltammetry. The polymer light-emitting diodes were fabricated with ITO/PEDOT:PSS/polymer/TPBi/BPhen/LiF/Al.
The four varied side chains of charged iridium(III) complexes were synthesized and characterized for organic light emitting diodes. The core materials were designed with 9,9-bis(4-methoxyphenyl)-4,5-diazafluorene as the bulky N^N ligand which prevent the π-π stacking interaction in the solid state. Their photophysical and electrochemical properties were investigated. OLEDs were fabricated with the structure ITO/PEDOT:PSS/ PVK:complex (10:7 by weight)/ TPBi/LiF/Al. The similar colors were obtained with varied OLEDs performances. We concluded that the long alkyl chains affected to the excellent film-forming property of emitting layer. Therefore, the device based on the n-octyl chain namely [(9,9-bis(4-octyloxyphenyl)-9H-cyclopentadipyridine-N-N′)-bis-(2-phenylpyridine-C2′,N)-iridium(III)] haxafluorophosphate (C8) showed the maximum current efficiency and brightness of 11.37 cd/A and 3,926 cd/m2, respectively.
Organic light emitting diodes (OLEDs) have been known for the next generation of display technology. In this work, we synthesized four benzo[d,e]chromene derivatives (BS01-BS04) varying the position of fluorine atom for OLED application. The compounds were characterized by 1H and 13C NMR, FTIR and mass spectroscopy. Their photoluminescence properties were studied which showed the thermally activated delayed fluorescence (TADF) character from intramolecular charged transfer (ICT) transition. The compounds were used as a dopant for OLEDs in the structure of ITO/NPB/BS01-BS04/Bphen/LiF/Al. The BS02 device exhibited green colour with the current efficiency at 1.28 cd/A and the power efficiency at 0.47 Im/W.
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