Solution-processed blue phosphorescent OLEDs with carbazole-based polymeric host materials

Unprecedented Nucleophilic Attack of Piperidine on the Electron Acceptor during the Synthesis of Push‐Pull Dyes by a Knoevenagel Reaction

“…From the cyclic voltammograms and based on the oxidation and reduction potentials of PP1 -PP4, an experimental determination of their HOMO and LUMO energy levels was possible. [34,35] As shown in the Figure 10 and in Table 4, a good agreement between the experimental and the theoretical values can be found. If a difference of 0.2 eV and 0.4 eV could be respectively found between the experimental and the theoretical values for the HOMO and the LUMO levels, variations of the theoretical HOMO and LUMO energy levels followed the same trend than that observed for the experimental ones.…”

“…100 mV could be observed for PP1 which comprises the most electron‐withdrawing group. From the cyclic voltammograms and based on the oxidation and reduction potentials of PP1 – PP4 , an experimental determination of their HOMO and LUMO energy levels was possible . As shown in the Figure and in Table , a good agreement between the experimental and the theoretical values can be found.…”

Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

“…While using FIrpic as the dopant, device efficiencies could be greatly enhanced by pre-heating the emissive solution at an elevated temperature before spin-coating. Thus, the maximum efficiency of P70-containing devices could be enhanced from 40.4 to Length of the alkyl spacer introduced between the main chain and the pendent carbazole can also impact device performances and the detrimental role of this spacer was recently evidenced with a comparison between P57 and P71 [165]. Interestingly, prior to this work, a comparative study carried out on tricarbazoles separated by alkyl chains of different lengths have evidenced the molecular host bearing the longest chains to be the best candidate to host Ir(ppy) 3 [166].…”

Recent advances on carbazole-based photoinitiators of polymerization

“…In this field, carbazole is a representative example. This symmetric structure which is extremely cheap has been extensively studied in Organic Electronics due to its remarkable electron-donating ability, its low oxidation potential and its facile chemical modification so that a wide range of hole-transport materials [75,76], molecular glasses [77][78][79][80], or light-emitting materials [81][82][83][84][85] have been designed with carbazole. Considering that push-pull dyes can be easily synthesized with this electron donor, carbazole was also an excellent candidate for the design of light-harvesting materials for solar cells, and numerous dyes exhibiting high molar extinction coefficients and broad absorption spectra were obtained with this planar electron donor [86,87].…”