Synthesis and Characterization of New Photoluminescent Oxadiazole/Carbazole-Containing Polymers

Abstract

We report on the synthesis and the characterization of a new class of segmented polyethers POC containing the oxadiazole and carbazole units. The polymers exhibit a high thermal stability, high glass transition temperatures, and good solubility in common organic solvents, despite the extended aromatic portion in the main polymer chain. The synthetic procedures are simple, and no acid side-products are obtained. According to previous reports on oxadiazole/carbazole-containing materials, POCs show high photoluminescence activity in the blue region of the visible spectra. The good solubility in chlorinate solvents allows the preparation of films with homogeneous thickness by spin coating. Glass transition temperature in the range 115– ensures good stability of film morphology at room temperature. The only exception is POC(6), which shows a poor solubility and higher (), due to its shorter aliphatic chain portion. For these features, polymers POC are potential candidate materials for fabricating blue light-emitting devices.

Solid-State Highly Efficient DR Mono and Poly-dicyano-phenylenevinylene Fluorophores

“…In white PLEDs (WPLEDs), white emission has provided the use of polymer–polymer blends or polymer–small-molecule blends as emissive layers, and the role of the red emitting component is relevant and sensitive [ 4 ]. Compared with green and blue emitters [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], the development of red-light emitting materials is far behind in terms of both purity and efficiency, but is highly required for RGB (red-green-blue)-based devices. In particular, for fluorescence bioimaging and assay applications, the optimal materials are DR/NIR photo emitters with high photoluminescence quantum efficiency, large Stoke’s shifts (for eliminating self-absorption), good chemical and thermal stability, good solubility and processability [ 14 ].…”

Solid-State Highly Efficient DR Mono and Poly-Dicyano-Phenylenevinylene Fluorophores

“…In white PLEDs (WPLEDs) white emission has provided using polymer-polymer blend or polymer-small-molecule blend as emissive layer and the role of the red emitting component is relevant and sensitive [4]. Compared with green and blue emitters [5][6][7][8][9][10][11], the development of redlight emitting materials is far behind in terms of both purity and efficiency but highly required for RGB (red-green-blue) based devices. In particular, for fluorescence bioimaging and assay applications, the optimal materials are DR/NIR photo emitters with high photoluminescence quantum efficiency, large Stoke's shifts (for eliminating self-absorption), good chemical and thermal stability, good solubility and processability [12].…”

The Effect of Bulky Substituents on Two π-Conjugated Mesogenic Fluorophores. Their Organic Polymers and Zinc-Bridged Luminescent Networks

“…The fast-growing field of organic light emitting diodes OLEDs has led to the synthesis of numerous new luminescent materials [11,12,64], in which fluorophores are covalently bonded in a polymer chain, in the attempt to transfer the PL properties of low molecular weight fluorogenic cores into a macroscopic system. We engineered and synthesized both organic homo- and copolymers based on the PV and AB emissive moieties to obtain emissive materials whose processability, stability, and reproducibility could not be guaranteed by doped materials.…”

“…The development of solid state fluorescent materials, based on an organic scaffold or metal containing, is an area of research in enormous development due to the numerous applications for the study of biological [1,2,3] and photonic systems [4,5,6,7,8,9,10]. Extended π-system with donor-acceptor framework featuring a large dipole moment in the excited state are often reported as organic emitters in the solid state and as candidates for optoelectronic applications [11,12]. In particular, efficient deep red near IR photoluminescent (DR/NIR PL) emitters are chemically and thermally stable and are easily processable; thus, they are optimal candidates for fluorescence bioimaging and assay applications [13].…”