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Relevant academic research and scientific papers

Synthesis and characterization of blue-to-green electrophosphorescence emitter based on pyrazole iridium complexes

To overcome the roll-off efficiency of electrophosphorescent organic light-emitting devices, Ir(III) complexes of (ppz)2Ir(N?N) were synthesized and named for (ppz)2Ir(tfmpptz), (ppz) 2Ir(fpptz), (ppz)2Ir(tfmptz) and (ppz)2Ir(pybi) (ppz: 1-phenylpyrazolato; N?N: N, N′-heteroaromatic). Their molecular structures, photophysical properties and cyclic voltammetric data were reported. The crystals of (ppz)2Ir(tfmpptz), (ppz) 2Ir(fpptz) are monoclinic, space group P2(1)/n, and (ppz) 2Ir(tfmptz) is triclinic, space group P-1. The emission maximum peaks of (ppz)2Ir(tfmpptz), (ppz)2Ir(fpptz), (ppz) 2Ir(tfmptz) and (ppz)2Ir(pybi) at room temperature appear at 486, 497, 473 and 530 nm, respectively. The devices with architecture of ITO/NPB (30 nm)/CBP: (ppz)2Ir(N?N) (6%, 30 nm)/BAlq(10 nm)/Alq3(30 nm)/LiF(1 nm)/Al (100 nm) were fabricated by thermal evaporation. The results indicate that the larger steric hindrance of ancillary ligands efficiently suppressed the roll-off of efficiency at high current density.

Ir(III) phosphors modified with fluorine atoms in pyridine-1,2,4-triazolyl ligands for efficient OLEDs possessing low-efficiency roll-off

Five neutral heteroleptic Ir(III) complexes 1-5 using the same cyclometalated ligand and different pyridine-1,2,4-triazolyl derivatives as ancillary ligands with fluorine substituents attached, were rationally designed and prepared. Their photophysical, electrochemical, and thermal properties were studied, and theoretical calculations were performed to understand the emission behaviors as well. Introducing fluorine atoms has little effect on the photophysical and thermal properties, but the performances of the resulting devices can be fine-tuned. Among them, a heavy doping level device employing a phosphor with five fluorine atoms delivers superior device efficiencies with ηc = 32.6 cd A-1 and ηp = 27.6 lm W-1, respectively, which is higher than those of other counterparts. Importantly, such a device exhibits almost negligible roll-off in luminance efficiency. Despite nondoped devices achieving good EL performance, more fluorine atoms lead to a relatively higher efficiency roll-off. The results suggest that rational incorporation of fluorine atoms into the ancillary ligands can significantly improve the performance of devices with features of high efficiency and small roll-off.

Synthesis and photoelectric properties of a solution-processable yellow-emitting iridium(iii) complex

A solution-processable yellow-light-emitting heteroleptic phosphorescent Ir(iii) complex of (CzhBTZ)2Ir(fpptz) [CzhBTZ: (2-[2-(6-(9-carbazolyl)hexyl)phenyl]benzothiazole) fpptz: (2-(5-(4-fluorophenyl)-2H-1,2,4-triazol)-3-yl)] was synthesized. Its photophysical, thermal and electroluminescence properties were investigated. Phosphorescent organic light-emitting diodes (PhOLEDs) using (CzhBTZ)2Ir(fpptz) doping in (4,4′-bis(N-carbazolyl)-1,1′-biphenyl) as the emitting layer were prepared by spin-coating with a maximum peak at 533 nm, and International Commission on Illumination (CIE) coordinates of (0.42, 0.56).