478697-23-3

Upstream product

• 4181-05-9 4-(diphenylamino)benzaldehyde 
• 62-53-3 aniline 
• 84-11-7 9,10-phenanthrenequinone 
• 603-34-9 N,N-diphenylaminobenzene 

Relevant academic research and scientific papers

Phenanthro[9,10-d]imidazole based new host materials for efficient red phosphorescent OLEDs

We report on the synthesis and characterization of a new series of bipolar phenanthro[9,10-d]imidazole based compounds. The derivatives are highly thermally stable materials as demonstrated by thermogravimetric analysis. Electron photoemission spectra of thin layers of the materials show ionization potentials in the range of 5.1–5.4?eV. Spectroscopic properties of the phenanthro[9,10-d]imidazole based derivatives were determined by absorption and photoluminescence measurements. All the developed materials were used as hosts in red phosphorescent organic light-emitting diodes and their properties were compared with commercially available host materials. Results indicate that a device with 2-[4-(N,N-diphenylamino)phenyl]-1-phenylphenanthro[9,10-d]imidazole exhibited superior performance with peak efficiency of 15.9% (21.5?cd/A and 29.9?l?m/W) and very low turn on voltage of 2.8?V. Efficiency of the device is about 35–67% higher than those of devices containing commercial host materials.

Highly efficient deep-blue light-emitting material based on V-Shaped donor-acceptor triphenylamine-phenanthro[9,10-d]imidazole molecule

Based on novel phenanthro[9,10-d]imidazole (PI) chromophore, three deep-blue luminescent donor-acceptor molecules with different molecular configurations at the triphenylamine (TPA) core were designed and synthesized, the linear TPA-1PI, the V-shaped TPA-

Structure-property relationship of blue solid state emissive phenanthroimidazole derivatives

Seven new derivatives of phenanthro[9,10-d]imidazole having differenet substituents at the 1st and the 2nd positions of the phenanthroimidazole moiety were synthesized and characterized. The comparative study of their properties was performed employing thermal, optical, electrochemical and photoelectrical measurements. The properties of the newly synthesized compounds were compared with those of earlier reported derivatives of phenanthroimidazole and several interesting new findings were disclosed. Density functional theory calculations accompanied by optical spectroscopy measurements have shown the possibility of tuning the emission properties (excited-stated decay rate, fluorescence quantum yield, etc.) of phenanthro[9,10-d]imidazole derivatives via attachment of different substituents to the 1st and the 2nd positions. The most polar and bulky substituents linked to the 2nd position were found to have the greatest impact on the emissive properties of compounds causing (i) fluorescence quantum yield enhancement of dilute liquid and solid solutions (up to 97%), (ii) suppression of intramolecular torsion-induced nonradiative excited-state relaxation in rigid polymer films as well as (iii) inhibition of aggregation-promoted emission quenching in the neat films. Most of the studied compunds exhibited ambipolar charge transport character with comparable drift mobilities of holes and electrons. The highest hole and electron mobilities approaching 10-4 cm2 V-1 s-1 were observed for the derivative having a triphenylamino group at the 1st position of the imidazole ring and the phenyl group at the 2nd position. The estimated triplet energies of phenanthro[9,10-d]imidazole compounds were found to be in the range of 2.4-2.6 eV, which is sufficiently high to ensure effective energy transfer to yellow/red emitters.

Enhanced proportion of radiative excitons in non-doped electro-fluorescence generated from an imidazole derivative with an orthogonal donor-acceptor structure

A greatly enhanced proportion of radiative excitons in non-doped blue electroluminescence with a maximum exciton utilizing efficiency (EUE) of 85% is harvested in the orthogonal cyano substituted, charge transfer (CT) emitter TPMCN, in comparison to the localized emission (LE)-like emitter TPM with a low EUE of 16%.

High efficiency nondoped deep-blue organic light emitting devices based on imidazole-π-triphenylamine derivatives

High-performance deep-blue emitting phenanthroimidazole derivatives with a structure of donor-linker-acceptor were designed and synthesized. By using different linkers and different linking positions, four deep-blue emitters were obtained and used as emit