Synthesis and characterization of heteroatom substituted carbazole derivatives: potential host materials for phosphorescent organic light-emitting diodes

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

“…The PL spectra of PEPK and PEPEK were recorded in CH 2 Cl 2 upon excitation at 310 nm and showed an emission peak at 366 nm for the two polymers. Here again, the emission wavelength for the two polymers is close to that observed for isolated carbazole molecules such as N-ethylcarbazole (358 nm) or PVK (374 nm), even if a blue-shift of 8 nm compared to that of PVK is observed for the two polymers [59]. The blue-shifted emission of PEPK/PEPEK is tentatively assigned to the differently constrained steric environment existing in PVK and the two polymers.…”

Green and red phosphorescent organic light-emitting diodes with ambipolar hosts based on phenothiazine and carbazole moieties: photoelectrical properties, morphology and efficiency

“…The reactions were successfully accomplished by using the iodinated carbazole derivatives. [11][12][13] In our work, we used easily synthesized Brsubstituted carbazole compounds. CzBisPhen and CzMonoPhen were synthesized by the palladium-catalyzed BuchwaldHartwig reactions between Br-substituted carbazole derivative and phenothiazine.…”

“…Furthermore, the holes carrier mobility values of CzBisPhen and this molecular mixture in weight proportion 1 : 1 with bisphenol Z polycarbonate were previously published. 10,12 However, the samples were prepared by casting the solutions and the electron mobilities were not detected.…”

Poly(2-(N-carbazolyl)ethyl acrylate) as a host for high efficiency polymer light-emitting devices

“…The ease and potential low-cost of fabrication of 60 PLEDs opens the way towards large-area displays and 61 lighting that would be difficult to access by using 62 traditional high vacuum processes. Among all phosphors 63 that have been investigated to date, iridium complexes 64 are undoubtedly the most widely studied. These com- 65 plexes have mostly been incorporated as neutral emitters 66 [6-15], but light-emitting devices have also been fabri- 67 cated with cations [16][17][18][19][20], anions [21,22] or soft salts 68 [23,24] where the anion and its cationic counterpart can 69 both participate in light emission when the two partners 70 are properly chosen.…”