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Relevant academic research and scientific papers

Highly efficient deep-blue phosphorescence from heptafluoropropyl-substituted iridium complexes

New deep-blue iridium complexes, consisting of a heptafluoropropyl (HFP) substituent at the 3′ position of 2′,4′′-difluorophenyl, have a deep HOMO level and decreased shoulder electronic transition and inhibit self-quenching due to the sterically hindered

METAL COMPLEX FOR DOPANT OF A LIGHT EMITTING LAYER AND BLUE PHOSPHORESCENT ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME

The present invention relates to a metal complex compound which can have improved color coordinates, increased efficiency and improved stability. The metal complex compound is represented by chemical formula 1.COPYRIGHT KIPO 2018

Important role of ancillary ligand in the emission behaviours of blue-emitting heteroleptic Ir(III) complexes

A series of heteroleptic Ir(iii) complexes composed of 2-(2,4-difluoro-3-(trifluoromethyl)phenyl)-4-methylpyridine (dfCF3) as the main ligand and such ancillary ligands as acetylacetonate [Ir(dfCF3)2(acac)] (acac), picolin

METAL COMPLEX FOR DOPANT OF A LIGHT EMITTING LAYER AND BLUE PHOSPHORESCENT ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME

An objective of the present invention is to provide a metal complex compound for a dopant of a light emitting layer, which may have improved color coordinates, increased efficiency and improved stability. The metal complex compound for the dopant of the l

METAL COMPLEX FOR DOPANT OF A LIGHT EMITTING LAYER AND BLUE PHOSPHORESCENT ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME

The following metal complexes made of a formula 1. [Formula 1] (by machine translation)

Novel Iridium complexes containing perfluoroalkyl group and organic electroluminescent devices using the same

The present invention relates to an iridium complex compound containing perfluoroalkyl and an organic electroluminescent device using the iridium complex compound, wherein the iridium complex compound has an excellent luminous efficiency as a blue light-e

Sky-blue phosphorescent iridium(III) complexes with two substituted 2-phenylpyridine derivatives and one picolinic acid for organic light-emitting diodes

Two sky-blue phosphorescent heteroleptic cyclometalated iridium(III) complexes, bis(2-(2′,4′-difluoro-3′-trifluoromethylphenyl)-4- methylpyridinato-N,C2′)iridium(picolinate) [(dfpmpyCF 3)2Ir(pic)] (1) and bis(2-(2′,4′-difl

Rational design, synthesis, and characterization of deep blue phosphorescent Ir(III) complexes containing (4′-Substituted-2′- pyridyl)-1,2,4-triazole ancillary ligands

On the basis of the results of frontier orbital considerations, 4-substituted-2′-pyridyltriazoles were designed to serve as ancillary ligands in 2-phenylpyridine main ligand containing heteroleptic iridium(III) complexes that display deep blue phosphorescence emission. The iridium(III) complexes, Ir1-Ir7, prepared using the new ancillary ligands, were found to display structured, highly quantum efficient (Φp = 0.20-0.42) phosphorescence with emission maxima in the blue to deep blue 448-456 nm at room temperature. In accord with predictions based on frontier orbital considerations, the complexes were observed to have emission properties that are dependent on the electronic nature of substituents at the C-4 position of the pyridine moiety of the ancillary ligand. Importantly, placement of an electron-donating methyl group at C-4′ of the pyridine ring of the 5-(pyridine-2′-yl)-3-trifluoromethyl-1,2,4-triazole ancillary ligand leads to an iridium(III) complex that displays a deep blue phosphorescence emission maximum at 448 nm in both the liquid and film states at room temperature. Finally, an OLED device, constructed using an Ir-complex containing the optimized ancillary ligand as the dopant, was found to emit deep blue color with a CIE of 0.15, 0.18, which is close to the perfect goal of 0.15, 0.15.

Blue emitting cationic iridium complexes containing two substituted 2-Phenylpyridine and One 2,2'-biimidazole for solution-processed organic light-emitting diodes (OLEDs)

Two new blue emitting cationic iridium(III) complexes with two substituted 2-phenlypyridine ligands as main ligands and one 2,2'-biimidazole as an ancillary ligand, [(L1)2Ir(biim)]Cl (1) and [(L2)2Ir(biim)]Cl (2), where L1 = 2-(2',4'-difluorophenyl)-4-methylpyridine, L2 = 2-(2',4'-difluoro-3'- trifluoromethylphenyl)-4-methylpyridine and biim = 2,2'-biimidazole, were synthesized for applications in phosphorescent organic lightemitting diodes (PhOLEDs). Their photophysical, electrochemical and electroluminescent (EL) device performances were examined. The photoluminescent (PL) spectra revealed blue phosphorescence in the 450 to 485 nm range with a quantum yield of more than 10%. The iridium(III) compounds studied showed good solubility in organic solvents with no solvatochromism dependent on the solvent polarity. The solutionprocessed OLEDs were prepared with the configuration, ITO/PEDOT:PSS (40 nm)/mCP:Ir(III) (70 nm)/ OXD-7 (20 nm)/LiF (1 nm)/Al (100 nm), by spin coating the emitting layer containing the mCP host doped with the iridium phosphors. The best performance of the fabricated OLEDs based on compound 1 showed an external quantum efficiency of 4.5%, luminance efficiency of 8.52 cd A-1 and blue emission with the CIE coordinates (x,y) of (0.16, 0.33).

Deep-blue phosphorescent iridium complexes with picolinic acid N-oxide as the ancillary ligand for high efficiency organic light-emitting diodes

A new series of highly efficient deep-blue phosphorescent Ir(III) complexes, (F2CH3ppy)2Ir(pic-N-oxide) 6 and (F2CF3CH3ppy)2Ir(pic-N-oxide) 7, based on phenylpyridine (ppy) as th