OLEDs (organic light-emitting diode) devices were assembled with PFTB (or poly[9,9-dioctifluorene-alt-bis-tienilene(benzotiadiazole)]) copolymer as light emitting layer. This copolymer was synthesized in the laboratory by Suzuki coupling reaction and it showed yield of 80% with maximum fluorescence peak in ± 710 nm. In the architectures of OLEDs were used commercial AZO layers:
Simple methods for manufacturing white light‐emitting diodes (WLEDs) based on ZnO are still challenging researchers. Solution processed WLEDs based on Al doped ZnO (AZO) nanoparticles embedded in PVK (hybrid system) are demonstrated here, and PL studies of the hybrid system suggest that defects in AZO and PVK/AZO interface are likely to be the origin of white EL. Besides electrical conductivity increment, AZO provided the emissive layer with a more balanced charge injection; thus, the threshold voltage reduced from 8.1 V to 7.5 V and EL enhanced from 4.47 cd/m2 to 18.69 cd/m2 at 10 V, for the pure PVK compared to the hybrid system, respectively.
Polymer light emiting diodes (PLEDs) were manufactured using poly(9vinylcarbazole) (PVK), poly(9,9-dioctylfluorene) (PFO) and poly(9,9-dioctylfluorenealt-1,4-fluorphenylene) (PF PF ) doped with different concentrations of tris-(2phenylpyridinate) iridium(III) [Ir(ppy) 3 ],a phosphorescent dye, as the active layer.Results showed that PFO based devices doped with 4 wt. % of Ir(ppy) 3 presented the highest current and power efficiencies, and the PVK based devices' electroluminescence spectrum showed an emission centered at 540 nm, suggesting that a charge unbalance and light emission from the injection layer of aluminum doped zinc oxide (AZO) occurred. Therefore, studies based on the PVK:AZO system and different PVK's average molar masses were elaborated to observe the PLEDs' electrical and optical properties. Results showed that AZO is a photo/electroluminescent material and it is responsible for the broad emission in the visible range. The hybrid device showed near pure white light emission and its purity reached 0.19.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.