Polyethers with pendent phenylvinyl substituted carbazole rings as polymers for hole transporting layers of OLEDs

Diphenylimidazole Based Fluorophores for Explosive Chemosensors and as Efficient Host Materials for Green Phosphorescent Organic Light Emitting Diodes

“…All the fluorophores shown in Figure a have comparable decomposition temperatures because of their similar molecular frameworks. , Figure b displays the DSC curves of heating scans at 10 °C/min, which show the exact T g values of materials. It is seen that the glass transition of fluorophores was observed at rather high temperatures from 148 to 230 °C, and no peaks because of crystalline and melting appeared during all the experiments; i.e., the materials are well suited for the formation of amorphous layers. , Therefore, the prerequisite criteria for highly efficient smart OLEDs is the thermal stability of the materials, and to prevent crystallization of the amorphous films, the glass transition temperature should be above 100 °C. − …”

“…It is seen that the glass transition of fluorophores was observed at rather high temperatures from 148 to 230 °C, and no peaks because of crystalline and melting appeared during all the experiments; i.e., the materials are well suited for the formation of amorphous layers. 41,42 Therefore, the prerequisite criteria for highly efficient smart OLEDs is the thermal stability of the materials, and to prevent crystallization of the amorphous films, the glass transition temperature should be above 100 °C. 43−45…”

Vinylene-versus azomethine-bridged carbazole-based polymers for light emission and sensor applications

“…A first derivative is using a vinylene-group as π-conjugated bridge (P1) while the second material is using an azomethine bridge (P2) (Scheme 1). In addition to the excellent photochemical stability [26] and good hole transport properties of the carbazole [27], the use of hydroquinone has been motivated by the high electroluminescence quantum yields, the high thermal stability and the good electron transport properties of hydroquinone-based materials [28]. This work aims to study the effect of replacing the vinylene linkers (P1) by azomethine ones (P2), on the thermal, optical and electrical properties of the -conjugated carbazole-based polymers .We also explored the effect of protonating the poly-azomethine with trifluoroacetic on photophysical and electrical properties of this polymer P2.…”

Photophysical Properties of the PVK-MEH-PPV/PCBM Composite for Organic Solar Cells Application: Synthesis, Characterization and Computational Study

“…The mastering of coupling optoelectronic properties and polymer structures makes the emergence of organic electronics an interest [ 1 , 2 , 3 , 4 ] for scientists hoping to work in this field of research. Their challenge is to at least obtain a stable organic material that is also flexible and can be implemented [ 5 , 6 , 7 ] as an active layer in optoelectronic devices, especially organic solar cells.…”