scholarly journals Highly Isotactic Poly(N-butenyl-carbazole): Synthesis, Characterization, and Optical Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Antonio Botta ◽  
Vincenzo Venditto ◽  
Alfredo Rubino ◽  
Stefania Pragliola
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectra ◽  
Light Emission ◽  
Organic Light Emitting Diodes ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Organic Light ◽  
Optical Applications ◽  
Carbazole Group

The synthesis of isotactic poly(N-butenyl-carbazole) (i-PBK) by using homogeneous isospecific Ziegler-Natta catalytic system is reported. The achieved polymer is crystalline and shows, to DSC and X-ray analysis, two distinct crystalline phases.i-PBK FTIR spectrum and X-ray diffraction pattern are compared with those of poly(N-vinylcarbazole) (PVK). The observed differences are tentatively associated with higher flexibility of thei-PBK chains due to the alkylene group connecting the carbazole group to the main chain.i-PBK optical properties are also compared with those of PVK and isotactic poly(N-pentenyl-carbazole) (i-PPK), a higher homologue ofi-PBK recently used as emitting layer in organic light emitting diodes (OLEDs) showing white light emission. The close similarity of the fluorescence spectra ofi-PBK andi-PPK is a promising basis for optical applications of this polymer.

TOWARD EFFICIENT ELECTRON-TRANSPORTING AND BLUE-EMITTING MATERIALS FOR ORGANIC LIGHT-EMITTING DIODES: STRUCTURE AND PHOTOLUMINESCENT PROPERTIES OF SILOLE DERIVATIVES

2005 ◽  
Vol 14 (04) ◽  
pp. 487-495 ◽  
Author(s):  
YOUNGJIN KANG ◽  
JUNGCHEOL PARK ◽  
JUN HEO ◽  
KI-MIN PARK ◽  
JUN-HWAN AHN ◽  
...  
Keyword(s):  
Reduction Potential ◽  
Energy Levels ◽  
Coupling Reaction ◽  
Organic Light Emitting Diodes ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Cyclic Voltametry ◽  
Organic Light ◽  
Cross Coupling Reaction

The potential blue-emitting as well as electron-transporting materials, 2,5-bis(3,5-trifluoromethylphenyl)-1,1-dimethyl-3,4-diphenylsilole (silole = silacyclopentadiene) (1) and 2,5-bis(3,5-trifluoromethylphenyl)-1,1-diphenyl-3,4-diphenylsilole (2), were synthesized by the Pd-mediated cross coupling reaction of corresponding bis(pheny-lethynyl)silanes with 1-bromo-3,5-trifluoromethylbenzene via intramolecular reductive cyclization. The structure of 2 was established by single-crystal X-ray diffraction analysis. In crystal structure, the dihedral angle between the functionalized phenyl groups containing CF3 at 2,5-position and central silole ring is about 48.70(6)°, showing the diminution of effective conjugation. These compounds exhibited high thermal stability without degradation up to 200°C. The absorption and photoluminescent properties, and cyclic voltametry have been evaluated. Compounds 1 and 2 in thin films showed intense blue emissions at 464–473 nm, respectively, in photoluminescence (PL). In electrochemistry, the reduction potential of 1 and 2 were at -1.92 and -1.81 V, respectively. The presence of substituents at 2,5′ — and/or 1,1′ — positions of siloe ring affected the LUMO energy levels through σ*–π* conjugation.

Optical Properties of 5,5'-(9,9-dioctyl-9H-fluorene-2,7-diyl)Bis(thiophene-2-carbal dehyde): A Novel Organic Light Emitting Material

2014 ◽  
Vol 941-944 ◽  
pp. 662-665
Author(s):  
Ze Biao Tang ◽  
Xiao Xia Sun ◽  
He Wei Yan ◽  
Le Ping Miao
Keyword(s):  
Optical Properties ◽  
Blue Light ◽  
Fluorescence Spectra ◽  
Aldehyde Group ◽  
Organic Light Emitting Diodes ◽  
Target Compound ◽  
Absorption And Fluorescence Spectra ◽  
Light Emitting ◽  
Organic Light ◽  
Type Molecule

A novel D-A type molecule based on central fluorene unit and aldehyde group termini has been designed and constructed. Optical spectra show that, from the solution to the solid state, the absorption and fluorescence spectra of the compounds are red-shifted. Moreover, a red-shift of the absorbance maxima and the emission maxima of the compounds were observed due to the electron-accepting groups. Blue light-emitting properties with purity color range at 412–468 nm were also obtained. Thus, the target compound is expected to be a promising pure blue light-emitting material for applications in organic light-emitting diodes (OLEDs).

Synthesis and Optical Properties of D-A Type Organic Molecules Based on Fluorene and Carbazole

2014 ◽  
Vol 1061-1062 ◽  
pp. 291-295
Author(s):  
Ze Biao Tang ◽  
Xiao Xia Sun ◽  
Pei Lin Zhang
Keyword(s):  
Optical Properties ◽  
Blue Light ◽  
Fluorescence Spectra ◽  
Organic Molecules ◽  
Organic Light Emitting Diodes ◽  
Conjugated Molecules ◽  
Strong Emission ◽  
Light Emitting ◽  
Organic Light ◽  
New Compounds

The new compounds F2 and C2 have been successfully synthesized via the Vilsmeier-Haack reaction, which were designed to construct D-A type organic conjugated molecules composed of central fluorene and carbazole donating units and two aldehyde terminal accepting groups. Optical properties of the resulting compounds were examined by UV-vis and fluorescence spectroscopies. The fluorescence spectra of F2 and C2 both exhibiting strong emission peaks in the blue light regions, are expected to be promising pure blue materials for organic light-emitting diodes applications.

Synthesis of D-A Type Organic Molecules Based on Carbazole and Phenothiazine for Organic Light-Emitting Materials

2014 ◽  
Vol 1061-1062 ◽  
pp. 307-310 ◽  
Author(s):  
Ze Biao Tang ◽  
Xiao Xia Sun ◽  
Pei Lin Zhang
Keyword(s):  
Optical Properties ◽  
Blue Light ◽  
Fluorescence Spectra ◽  
Organic Molecules ◽  
Organic Light Emitting Diodes ◽  
Strong Emission ◽  
Light Emitting ◽  
Conjugated Organic Molecules ◽  
Organic Light ◽  
The Mean

Novel D-A type conjugated organic molecules composed of central carbazole and phenothiazine units and aldehyde terminal groups have been designed and constructed. Optical properties of the resulting compounds were examined by the mean of UV-vis and fluorescence spectroscopies. The fluorescence spectra of the molecule C2 based on central carbazole unit show strong emission peaks in the blue light regions, which are expected to be promising light-emitting materials for organic light-emitting diodes applications.

Synthesis of a Novel D-A Type Molecule Based on Carbazole Unit for Organic Light-Emitting Material Applications

2014 ◽  
Vol 989-994 ◽  
pp. 292-296
Author(s):  
Ze Biao Tang ◽  
Xiao Xia Sun ◽  
He Wei Yan ◽  
Le Ping Miao
Keyword(s):  
Optical Properties ◽  
Blue Light ◽  
Absorption Maximum ◽  
Fluorescence Spectra ◽  
Organic Light Emitting Diodes ◽  
Absorption And Fluorescence Spectra ◽  
Light Emitting ◽  
Organic Light ◽  
Light Region ◽  
Type Molecule

A novel D-A type molecule based on carbazole central core and aldehyde terminal groups has been designed and synthesized. Optical properties of the resulting compounds were examined by means of UV-vis and fluorescence spectroscopies. It shows that, the absorption and fluorescence spectra of M2 are large red-shifted relative to M1 in both states, whereas the absorption maximum and emission maxima of M1 and M2 are small blue-shifted, from solution to the solid state. The fluorescence spectra exhibit that the emission maxima of the compounds which range from 419 nm to 472 nm belong to blue light region. As expected, the target compounds should be a promising pure blue light-emitting material for applications in organic light-emitting diodes (OLEDs).

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