The Synthesis of Polyethersulfone (PES) and its Derivatives as Polymer Light Emitting Diode (PLED) Material

Nowadays some types of polymer are being developed as Polymer Light Emitting Diode (PLED) materials because they have some advantages compared to small molecule organic light emitting diode (SM-OLED). Polymers which have numerous conjugated double bonds can be used as PLED materials, such as the polyethersulfone (PES) and its derivatives. Therefore, further research on the synthesis of PES and its derivatives is needed to explore their potential as PLED materials. In this research, the synthesis of polyethersulfone has been performed utilizing Microwave Assisted Organic Synthesis (MAOS) method and subsequently the synthesized PES was being transformed into the nitrated PES (PES-NO2) and the aminated PES (PES-NH2) utilizing the conventional method (reflux). Polymer structure is elucidated through FT-IR and 1H-NMR spectrum. Polymer application as PLED material is characterized by fluorescence emission spectrum. The maximum wavelengths in the fluorecence emission spectra of polymer in NMP were 444 nm for PES, 356 nm and 444 nm for PES-NO2, also 440 nm for PES-NH2.Based on the various analyses of data, the synthesis of PES, PES-NO2, and PES-NH2 has been successfully performed and all of polymers have the potent to be used as PLED materials because of its ability to emit light (blue) in the visible area.

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Ideal blue thermally activated delayed fluorescence emission assisted by a thermally activated delayed fluorescence assistant dopant through a fast reverse intersystem crossing mediated cascade energy transfer process

Journal of Materials Chemistry C ◽

10.1039/c8tc06575f ◽

2019 ◽

Vol 7 (10) ◽

pp. 3082-3089 ◽

Cited By ~ 42

Author(s):

Si Hyun Han ◽

Jae Ho Jeong ◽

Ji Woong Yoo ◽

Jun Yeob Lee

Keyword(s):

Energy Transfer Process ◽

Light Emitting Diode ◽

Fluorescence Emission ◽

Delayed Fluorescence ◽

Thermally Activated Delayed Fluorescence ◽

Light Emitting ◽

Organic Light Emitting Diode ◽

Thermally Activated ◽

Organic Light ◽

Cascade Energy

A novel blue thermally activated delayed fluorescence (TADF) organic light-emitting diode with an emitting layer made up of a TADF assistant dopant and a pure blue-emitting TADF emitter was developed.

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A New Schiff’s Base Fluorescent Sensor for the Selective Detection of Mercury Ion

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.1105 ◽

2011 ◽

Vol 239-242 ◽

pp. 1105-1108 ◽

Cited By ~ 1

Author(s):

Xue Mei Wang ◽

Hua Yan ◽

Yong Chen ◽

He Bin Bao

Keyword(s):

Fluorescent Sensor ◽

Fluorescence Emission ◽

Emission Spectra ◽

Mercury Ion ◽

Fluorescence Measurement ◽

Fluorescence Emission Spectra ◽

H Nmr ◽

Complex Process ◽

Characteristic Wavelength ◽

Ft Ir

A new Hg2+-sensing and selective fluorescent sensor, 1-(1-pyrenecarboxaldehyd e)-thiocarbohydrazone, was synthesized and characterized by elemental analysis, FT-IR and 1H NMR spectra. Its fluorescence and recognition properties to the mercury ion were studied by the fluorescence emission spectra. With adding mercury ion into solution, the fluorescence emission intensities at different characteristic wavelength changed continually. Hence the ratiometric fluorescence measurement was used for detecting the complex process. It was found that a 1:1 stoichiometry complex is formed between the mercury ion and the compound with the association constants were 2.04×105 L/mol, respectively. And the detection limits of the mercury ion were 2.52×10-8 mol/L.

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Morphology and Mechanical Properties of a Novel Cellulose Nanofibers Based Nanocomposites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.936 ◽

2012 ◽

Vol 174-177 ◽

pp. 936-942

Author(s):

Ying Ying Xue ◽

Da Gang Li ◽

Qiao Yun Deng ◽

Yu Mei Wang ◽

Dong Liang Lin

Keyword(s):

Light Emitting Diode ◽

Cellulose Nanofibers ◽

Acrylic Resin ◽

Cellulose Fibers ◽

Sem Images ◽

Light Emitting ◽

Organic Light Emitting Diode ◽

Freeze Dried ◽

Ft Ir ◽

Ir Spectroscopic

The fibers were converted to nano-scale cellulose fibers by chemical and mechanical treatment in this paper. FT-IR spectroscopic analysis demonstrated that hemicelluloses and lignin were removed during the chemical process. After that, ultralsonication method was carried out to refine cellulose fibers to cellulose nanofibers (CNFs). The filtered CNFs film was freeze-dried. Scanning electron microscopy (SEM) images reflected a very high aspect ratio of single cellulose nanofiber was over 1000. The nanocomposites were fabricated to be transparent attributed to the good morphology of the nanocellulose. From the SEM images of fracture surface of nanocomposites, excellent distribution had been found in the nanocomposites. Elastic modulus of the nanocomposite film was determined through tensile test, which was typically higher than pure acrylic resin. Therefore, the obtained transparent nanocomposites with superior flexibility have the potential to be used as the base substrate for organic light-emitting diode display (OLED).

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