Sensitized organic light-emitting diodes: towards high efficiency and long lifetimes

Abstract

Sensitized organic light-emitting diodes (OLEDs) have obtained extensive attention in recent years owing to the exciton utilization improvement. Along with the advances in fluorescent, phosphorescent, and thermally activated delayed fluorescence...

Selective syntheses of homoleptic Ir(iii) complexes bearing di-CF3-functionalized benzoimidazol-2-ylidenes for generation of blue phosphorescence

“…Phosphorescent OLEDs are known to offer the full utilization of all excitons generated during operation, while hyper-OLEDs exhibit another capacity to further improve efficiency by transferring energy from sensitizers to fluorescent emitters. [58][59][60][61][62] The adjustable emission energy, enhanced spin-orbit coupling, and a greater MLCT fraction designate these Ir(III) carbene emitters as promising candidates for realizing effective FRET. 37,[63][64][65][66][67][68] The respective phosphorescent and hyper-OLEDs were constructed using the device structure: indium tin oxide (ITO)/4 wt% rhenium oxide (ReO 3 ): N,N-dicarbazolyl-3,5-benzene (mCP) (60 nm)/mCP (15 nm)/EML (20 nm)/tris-[3-(3-pyridyl)mesityl]borane (3TPYMB) (50 nm)/ lithium 8-hydroxyquinolinolate (Liq) (0.5 nm)/Al (100 nm).…”

Nanoporous Organic Frameworks as Light-Emitting Diodes: A Review

“…In addition to traditional semiconductors such as gallium nitride (GaN), indium gallium nitride, and aluminum gallium nitride, different luminescent materials have been used as active materials in LEDs. These include organic molecules for organic light-emitting diodes (OLEDs), − quantum dots (QDs) for quantum-dot light-emitting diodes (QLEDs), , perovskites, carbon nanotubes, biomass-derived materials, metal nanoclusters, porous materials, and so on. While LEDs are mainly used for displays in our everyday lives, their applications have also been extended to other functions such as data communications, biomedicine, and food preservation …”

Structural Optimization of BODIPY Derivatives: Achieving Stable and Long-Lived Green Emission in Hyperfluorescent OLEDs

“…Among the reported emitters as FD, the boron-dipyrromethene (BODIPY)-based fluorophores grabbed the interest due to their excellent photophysical properties, including high photoluminescence quantum yield (PLQY), narrow emission spectra, and high photo- and thermal stability. ,− However, their molecular planarity often causes an “aggregation caused quenching” (ACQ) effect in the solid states leading to luminance loss compared to that in dilute solution. − Such undesirable properties were addressed by increasing the intermolecular distances with peripheral bulky aryl- or alkyl-unit substitution on the dipyrrin core. In the quest for long-lived pure green OLEDs, Zhang et al developed a BODIPY derivative called tPhBODIPY by fusing a bulky m -(bis- t -butylphenyl) phenyl moiety at meso -position to suppress the ACQ effects in the solid states. , The tPhBODIPY showed a sharp emission at 518 nm with an fwhm of 28 nm.…”