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Upstream product

• 591-50-4 iodobenzene 
• 108-86-1 bromobenzene 
• 86-74-8 9H-carbazole 
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• 57103-20-5 3,6-dibromo-9-phenyl-9H-carbazole 
• 1150-62-5 N-phenylcarbazole 

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• 1040414-42-3 C₄₀H₂₆N₂ 

Relevant academic research and scientific papers

High hole mobilities in carbazole-based glass-forming hydrazones

The properties of a series of carbazole-based dihydrazones are reported. The dependence of their thermal and glass-forming properties on their chemical structure is discussed. The hydrazones having phenyl substituents at the N atom of the hydrazine moiety form glasses and their amorphous films on the glass or polyester substrates can be prepared by casting from solutions. The ionization potentials of the synthesized hydrazones measured by the electron photoemission technique range from 5.24 to 5.50 eV. Hole drift mobilities of some newly synthesized carbazole-based dihydrazones appproach 10-2 cm2 V-1 s-1 at an electric field of 6.4 × 105 V cm-1, at 22 °C.

Organic compound, application thereof and organic electroluminescent device

The invention relates to the field of organic light-emitting devices, and discloses an organic compound, application thereof and an organic light-emitting device, and the compound has a structure as shown in a formula (I). The organic compound provided by the invention has relatively high glass transition temperature, decomposition temperature and refractive index, and when the organic compound is applied to a covering layer on a device, the light extraction efficiency of a cathode can be improved, so that the luminous efficiency of the device is improved.

An electronic transmission material and its preparation and device

The invention provides carbazole-imidazole electron transport materials. Based on triphenyl imidazole and carbazole, a kind of classic compounds is formed by connecting triphenyl imidazole and carbazole with benzene of different substituent groups. A preparation method is based on improvement of existing methods. Through repeated verification, the preparation method is simple in synthesis and purification processes and low in cost and can meet the industrial development requirements. A device prepared by using the substances has high light emitting efficiency.

Carbazole-containing push-pull chromophore with viscosity and polarity sensitive emissions: Synthesis and photophysical properties

Carbazole based D-π-A extended styryl dyes with intramolecular charge transfer characteristics were synthesized. The intramolecular charge transfers of these D-π-A extended styryls have been examined with the study of photophysical properties like absorption, emission and quantum yield in various solvents of different polarities. All the dyes demonstrated positive solvatochromism. They showed largely improved photophysical properties and large Stokes shifts due to twist geometry. Oscillator strengths and transition state dipole moments have been studied to understand charge transfer within the molecules. The fluorescence molecular rotors properties of the series of extended styryls have been evaluated. The dyes having good charge transfer characteristics showed better FMR properties. Sensitivity of the fluorescence emission towards solvent polarity and viscosity has been investigated using fluorescence emission spectra.

High-efficiency deep blue fluorescent emitters based on phenanthro[9,10-d]imidazole substituted carbazole and their applications in organic light emitting diodes

A series of highly efficient deep blue emitters comprising of carbazole and phenanthro[9,10-d]imidazole moieties are designed and synthesized. These compounds present deep blue emission, narrow FWHM, high quantum yields, high thermal and morphological stabilities. Among them, the design strategy of 2:1 ratio of phenanthro[9,10-d]imidazole and carbazole unit affords M2 with more balanced carrier injection and transporting properties. OLEDs using M2 as emitting layer is observed to deliver a truly deep blue CIE of y 3is attained with a maximum current efficiency of 33.35 cd A-1, a power efficiency of 22.99 lm W-1and a maximum external quantum efficiency of 9.47%. When doped with an orange fluorescent material, upon careful tuning the doping proportion, the two-emitting-component white OLED is successfully fabricated with a maximum current efficiency of 5.53 cd A-1and CIE coordinates of (0.313, 0.305). Both the non-doped and doped devices exhibited high operational stability with negligible efficiency roll-off over the broad current density range.

High-efficiency deep blue fluorescent emitters based on phenanthro[9,10-d]imidazole substituted carbazole and their applications in organic light emitting diodes

A series of highly efficient deep blue emitters comprising of carbazole and phenanthro[9,10-d]imidazole moieties are designed and synthesized. These compounds present deep blue emission, narrow FWHM, high quantum yields, high thermal and morphological stabilities. Among them, the design strategy of 2:1 ratio of phenanthro[9,10-d]imidazole and carbazole unit affords M2 with more balanced carrier injection and transporting properties. OLEDs using M2 as emitting layer is observed to deliver a truly deep blue CIE ofy 3 is attained with a maximum current efficiency of 33.35 cd A-1, a power efficiency of 22.99 lm W-1 and a maximum external quantum efficiency of 9.47%. When doped with an orange fluorescent material, upon careful tuning the doping proportion, the twoemitting-component white OLED is successfully fabricated with a maximum current efficiency of 5.53 cd A-1 and CIE coordinates of (0.313, 0.305). Both the non-doped and doped devices exhibited high operational stability with negligible efficiency roll-off over the broad current density range.

Synthesis, characterization, and field-effect transistor properties of carbazolenevinylene oligomers: From linear to cyclic architectures

Two cyclic carbazolenevinylene dimers 1 and 2 were synthesized by McMurry coupling reactions. A linear compound 3 was also prepared for comparison. Compounds 1-3 were fully characterized by means of NMR spectroscopy, HRMS, elemental analysis, and UV/Vis absorption spectroscopy. Quantum chemical simulations showed that the cyclic compounds possessed smaller HOMO-LUMO gaps and more extended conjugation. The UV/Vis absorption spectra of the cyclic compounds showed blueshifts compared with that of the linear compound 3. Time-dependent DFT (TD-DFT) analysis revealed that this was due to the different selection rules for molecules with cyclic and linear architectures. The cyclic conformation also significantly affected the molecular ordering in the solid state. The X-ray crystal structure of 1 showed partial π-π over-lapping between the adjacent mole-cules. Thin films of 1-3 were fabricated by the vacuum-deposition method on Si/SiO, substrates. Multicrystalline thin films were obtained from compounds 1 and 2, but only amorphous thin films could be obtained for the linear compound 3. Another important difference between the cyclic and linear compounds was the reduced reorganization energy for the cyclic compounds. These two facts have resulted in improved field-effect transistor (FET) mobilities for the cyclic compounds compared with the linear compound. In addition, as the substrate temperature has a significant influence on the morphology and the degree of crystallinity of the thin films deposited, the device performance could be optimized by varying the substrate temperature. The FET devices based on 2 gave the highest mobility of 0.013 cm2V -1s-1. The results showed that carbazole derivatives with cyclic structures might make better FETs.