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Papers by debashish nayak

Research paper thumbnail of Investigation of structural, optical and thermal properties of TiO2 reinforced g-C3N4 nanocomposite for emissive layer application

Materials Today: Proceedings

Research paper thumbnail of A survey of the structure, fabrication, and characterization of advanced organic light emitting diodes

Microelectronics Reliability

Research paper thumbnail of Tuning the optical properties of high quantum-yield g-C3N4 with the inclusion of ZnS via FRET for high electron–hole recombination

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Research paper thumbnail of Influence of ZnS on the structural, morphological, optical and thermal properties of Polyindole for an emissive layer

Inorganic Chemistry Communications

Research paper thumbnail of Tuning the optical properties and thermal stability of polymeric graphitic carbon nitride (g-C3N4) with inclusion of ZnS for an emissive layer

Luminescent polymeric graphitic composites have the potential to be efficient energy converters f... more Luminescent polymeric graphitic composites have the potential to be efficient energy converters for sophisticated displays and light sources. Thermal condensation is used to synthesize g-C 3 N 4 -ZnS composites. The XRD, and FTIR analyses confirmed the synthesis of the pure host, filler, and composites. FESEM, and TEM images revealed that the ZnS nanosheets were evenly distributed over the g-C 3 N 4 sheets. The addition of ZnS improves the thermal stability of g-C 3 N 4 . The optimized gZ15 band gap is determined to be 2.98 eV with a crystallite size of 4.2 nm and a micro stain of 35.42×10 −3 . With a purity of 63.4%, gZ15 demonstrated a significant rate of recombination in the blue region. All of the improved properties demonstrated that polymeric g-C 3 N 4 -ZnS was the optimum materials for usage in the active or emissive layer of optoelectronic devices.

Research paper thumbnail of Tailoring the properties of 2-D rGO-PPy-ZnS nanocomposite as emissive layer for OLEDs

Optik, 2021

Abstract The integration of semi-conductive materials into the polypyrrole (PPy) matrix tends to ... more Abstract The integration of semi-conductive materials into the polypyrrole (PPy) matrix tends to be an effective way to improve PPy's properties. Herein we report the laboratory synthesis of rGO-PPy-ZnS (rPZ) nanocomposites through in-situ oxidative polymerization processes. The structural and morphological verification of nanocomposites was carried out by XRD, FESEM and TEM. At the dominant wavelength, the Photoluminescence spectra display cyan color with a high rate of e − -h + recombination. The decrease in band gap (1.48 eV) and refractive index (2.52) of rPZ showing surface conductivity. The CCT and Duv value shows the light level above the black body curve and the color purity is 55.5 % . The current density has increased by 115 % , indicating an increase in conductivity. The decrease in the optical band gap, and improved conductivity with increased recombination frequency verified that the as-prepared rGO-PPy-ZnS (rPZ) nanocomposite can be used in OLED devices as an emissive layer.

Research paper thumbnail of Robust optoelectronic properties of PANI-Y2O3 nanocomposite as electron transport layer in OLEDs

AIP Conference Proceedings, 2020

Polyaniline-Yttrium Oxide (PANI-Y2O3) nanocomposites were synthesized via chemically oxidative po... more Polyaniline-Yttrium Oxide (PANI-Y2O3) nanocomposites were synthesized via chemically oxidative polymerization process. The formation of PANI, and PANI-Y2O3 nanocomposites with their corresponding changes in nanostructured properties were examined by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction Spectroscopy (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The UV-Vis analysis exhibited PANI-Y2O3 nanocomposite possess lower band gap and higher absorption intensity than pristine PANI. The PL spectra of PANI and PANI-Y2O3 nanocomposite reveals four bands as violet, blue, green and orange bands due to non-radiative recombination of electron-hole pair. The electrical properties for PANI-Y2O3 nanocomposite showed 78 % enhancement in current density. The PANI-Y2O3 nanocomposite exhibited enhanced carrier density and excellent rate of electron-hole recombination that proposed to be suitable candidate for electron transport layer in OLED devices.

Research paper thumbnail of Augmented properties for PPY-PANI-ZnO nanocomposite as electron transport layer material for organic light emitting diode (OLED) application

DAE SOLID STATE PHYSICS SYMPOSIUM 2018, 2019

Research paper thumbnail of Augmented optical and electrical properties of PMMA-ZnS nanocomposites as emissive layer for OLED applications

Research paper thumbnail of Conducting Polymer-Based Emissive Layer on Efficiency of OLEDs

Many changes have arisen in the world of display technologies as time has passed. In the vast are... more Many changes have arisen in the world of display technologies as time has passed. In the vast area of display technology, Organic light-emitting diode is a recent and exciting discovery. Organic light-emitting diodes (OLEDs) have received a lot of curiosity among the researcher in recent years as the next generation of lighting and displays due to their numerous advantages, such as superior efficiency, mechanical flexibility and stability, chemical versatility, ease of fabrication, and so on. It works on the theory of electroluminescence, which is a mechanism in which electrical energy converts to light energy. Organic LEDs have a thickness of 100 to 500 nanometers or 200 times that of human hair. In OLEDs, organic material can be used in two or three layers. The emissive layer plays a key role in OLEDs. Polymers are used in the emissive layer to enhance the efficiency of OLEDs at the same time self-luminescence materials are used in OLEDs. In displays, this self-illuminating proper...

Research paper thumbnail of Structural Analysis with Augmented Optoelectronic Performance of Polyindole–Polypyrrole–Cadmium Sulfide Nanohybrid: PIN/PPY/CdS

Journal of Inorganic and Organometallic Polymers and Materials, 2020

We report the comparative morphological, structural and optoelectronic properties of ternary PIN/... more We report the comparative morphological, structural and optoelectronic properties of ternary PIN/PPY/CdS nanohybrid material synthesized by chemical oxidative polymerization technique. The successful incorporation of CdS nanoparticles into polymeric PIN and PIN/PPY matrix was confirmed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopic (FT-IR) techniques. Moreover, the field emission scanning electron microscopic (FESEM) and transmission electron microscopic (TEM) techniques are performed to study the surface morphology of the as-synthesized specimens. The as-prepared ternary nanohybrid showed a reduced optical band gap (~ 1.92 eV) evaluated through Ultraviolet–Visible (UV–Vis) absorbance spectra. From the current density–voltage (J–V) characteristics, the Ohmic conductance ~ 0.126 S was found for the ternary nanohybrid PIN/PPY/CdS. In addition, the ternary nanohybrid exhibits comparatively the higher PL intensity which indicates the higher electron–hole recombination rate. All these results indicate the aptness of the as-synthesized PIN/PPY/CdS nanohybrid towards optoelectronic device application. Graphic Abstract

Research paper thumbnail of Investigation of structural, optical and electrical performance of ZnS sensitized PMMA nanocomposite as an emissive layer for OLED application

AIP Conference Proceedings

Pristine PMMA and PMMA-ZnS nanocomposites were synthesized via free radical polymerization proces... more Pristine PMMA and PMMA-ZnS nanocomposites were synthesized via free radical polymerization process. The formation of the PMMA matrix and its nanocomposite were confirmed by X-ray diffraction technique (XRD) analysis.The FESEM and TEM image of PMMA-ZnS nanocompositeshowed the mixture of pebbled and spherical ball like structure. Increase rate of electron-hole recombination of PMMA-ZnS nanocomposite was studied from PL spectra. The PL spectra of nanocomposite showed four bands attribute to the blue-violet band, blue band, green band and yellow band. The color coordinate of PMMA-ZnS nanocomposite was found to be in the blue region. The electrical properties showed the good conductive response in PMMA-ZnS nanocomposite. These optical and electrical properties confirmed that the proposed PMMA-ZnS nanocomposite can be used for OLED application as emissive layer.

Research paper thumbnail of Investigation of structural, optical and thermal properties of TiO2 reinforced g-C3N4 nanocomposite for emissive layer application

Materials Today: Proceedings

Research paper thumbnail of A survey of the structure, fabrication, and characterization of advanced organic light emitting diodes

Microelectronics Reliability

Research paper thumbnail of Tuning the optical properties of high quantum-yield g-C3N4 with the inclusion of ZnS via FRET for high electron–hole recombination

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Research paper thumbnail of Influence of ZnS on the structural, morphological, optical and thermal properties of Polyindole for an emissive layer

Inorganic Chemistry Communications

Research paper thumbnail of Tuning the optical properties and thermal stability of polymeric graphitic carbon nitride (g-C3N4) with inclusion of ZnS for an emissive layer

Luminescent polymeric graphitic composites have the potential to be efficient energy converters f... more Luminescent polymeric graphitic composites have the potential to be efficient energy converters for sophisticated displays and light sources. Thermal condensation is used to synthesize g-C 3 N 4 -ZnS composites. The XRD, and FTIR analyses confirmed the synthesis of the pure host, filler, and composites. FESEM, and TEM images revealed that the ZnS nanosheets were evenly distributed over the g-C 3 N 4 sheets. The addition of ZnS improves the thermal stability of g-C 3 N 4 . The optimized gZ15 band gap is determined to be 2.98 eV with a crystallite size of 4.2 nm and a micro stain of 35.42×10 −3 . With a purity of 63.4%, gZ15 demonstrated a significant rate of recombination in the blue region. All of the improved properties demonstrated that polymeric g-C 3 N 4 -ZnS was the optimum materials for usage in the active or emissive layer of optoelectronic devices.

Research paper thumbnail of Tailoring the properties of 2-D rGO-PPy-ZnS nanocomposite as emissive layer for OLEDs

Optik, 2021

Abstract The integration of semi-conductive materials into the polypyrrole (PPy) matrix tends to ... more Abstract The integration of semi-conductive materials into the polypyrrole (PPy) matrix tends to be an effective way to improve PPy's properties. Herein we report the laboratory synthesis of rGO-PPy-ZnS (rPZ) nanocomposites through in-situ oxidative polymerization processes. The structural and morphological verification of nanocomposites was carried out by XRD, FESEM and TEM. At the dominant wavelength, the Photoluminescence spectra display cyan color with a high rate of e − -h + recombination. The decrease in band gap (1.48 eV) and refractive index (2.52) of rPZ showing surface conductivity. The CCT and Duv value shows the light level above the black body curve and the color purity is 55.5 % . The current density has increased by 115 % , indicating an increase in conductivity. The decrease in the optical band gap, and improved conductivity with increased recombination frequency verified that the as-prepared rGO-PPy-ZnS (rPZ) nanocomposite can be used in OLED devices as an emissive layer.

Research paper thumbnail of Robust optoelectronic properties of PANI-Y2O3 nanocomposite as electron transport layer in OLEDs

AIP Conference Proceedings, 2020

Polyaniline-Yttrium Oxide (PANI-Y2O3) nanocomposites were synthesized via chemically oxidative po... more Polyaniline-Yttrium Oxide (PANI-Y2O3) nanocomposites were synthesized via chemically oxidative polymerization process. The formation of PANI, and PANI-Y2O3 nanocomposites with their corresponding changes in nanostructured properties were examined by Field Emission Scanning Electron Microscope (FESEM), X-ray Diffraction Spectroscopy (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The UV-Vis analysis exhibited PANI-Y2O3 nanocomposite possess lower band gap and higher absorption intensity than pristine PANI. The PL spectra of PANI and PANI-Y2O3 nanocomposite reveals four bands as violet, blue, green and orange bands due to non-radiative recombination of electron-hole pair. The electrical properties for PANI-Y2O3 nanocomposite showed 78 % enhancement in current density. The PANI-Y2O3 nanocomposite exhibited enhanced carrier density and excellent rate of electron-hole recombination that proposed to be suitable candidate for electron transport layer in OLED devices.

Research paper thumbnail of Augmented properties for PPY-PANI-ZnO nanocomposite as electron transport layer material for organic light emitting diode (OLED) application

DAE SOLID STATE PHYSICS SYMPOSIUM 2018, 2019

Research paper thumbnail of Augmented optical and electrical properties of PMMA-ZnS nanocomposites as emissive layer for OLED applications

Research paper thumbnail of Conducting Polymer-Based Emissive Layer on Efficiency of OLEDs

Many changes have arisen in the world of display technologies as time has passed. In the vast are... more Many changes have arisen in the world of display technologies as time has passed. In the vast area of display technology, Organic light-emitting diode is a recent and exciting discovery. Organic light-emitting diodes (OLEDs) have received a lot of curiosity among the researcher in recent years as the next generation of lighting and displays due to their numerous advantages, such as superior efficiency, mechanical flexibility and stability, chemical versatility, ease of fabrication, and so on. It works on the theory of electroluminescence, which is a mechanism in which electrical energy converts to light energy. Organic LEDs have a thickness of 100 to 500 nanometers or 200 times that of human hair. In OLEDs, organic material can be used in two or three layers. The emissive layer plays a key role in OLEDs. Polymers are used in the emissive layer to enhance the efficiency of OLEDs at the same time self-luminescence materials are used in OLEDs. In displays, this self-illuminating proper...

Research paper thumbnail of Structural Analysis with Augmented Optoelectronic Performance of Polyindole–Polypyrrole–Cadmium Sulfide Nanohybrid: PIN/PPY/CdS

Journal of Inorganic and Organometallic Polymers and Materials, 2020

We report the comparative morphological, structural and optoelectronic properties of ternary PIN/... more We report the comparative morphological, structural and optoelectronic properties of ternary PIN/PPY/CdS nanohybrid material synthesized by chemical oxidative polymerization technique. The successful incorporation of CdS nanoparticles into polymeric PIN and PIN/PPY matrix was confirmed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopic (FT-IR) techniques. Moreover, the field emission scanning electron microscopic (FESEM) and transmission electron microscopic (TEM) techniques are performed to study the surface morphology of the as-synthesized specimens. The as-prepared ternary nanohybrid showed a reduced optical band gap (~ 1.92 eV) evaluated through Ultraviolet–Visible (UV–Vis) absorbance spectra. From the current density–voltage (J–V) characteristics, the Ohmic conductance ~ 0.126 S was found for the ternary nanohybrid PIN/PPY/CdS. In addition, the ternary nanohybrid exhibits comparatively the higher PL intensity which indicates the higher electron–hole recombination rate. All these results indicate the aptness of the as-synthesized PIN/PPY/CdS nanohybrid towards optoelectronic device application. Graphic Abstract

Research paper thumbnail of Investigation of structural, optical and electrical performance of ZnS sensitized PMMA nanocomposite as an emissive layer for OLED application

AIP Conference Proceedings

Pristine PMMA and PMMA-ZnS nanocomposites were synthesized via free radical polymerization proces... more Pristine PMMA and PMMA-ZnS nanocomposites were synthesized via free radical polymerization process. The formation of the PMMA matrix and its nanocomposite were confirmed by X-ray diffraction technique (XRD) analysis.The FESEM and TEM image of PMMA-ZnS nanocompositeshowed the mixture of pebbled and spherical ball like structure. Increase rate of electron-hole recombination of PMMA-ZnS nanocomposite was studied from PL spectra. The PL spectra of nanocomposite showed four bands attribute to the blue-violet band, blue band, green band and yellow band. The color coordinate of PMMA-ZnS nanocomposite was found to be in the blue region. The electrical properties showed the good conductive response in PMMA-ZnS nanocomposite. These optical and electrical properties confirmed that the proposed PMMA-ZnS nanocomposite can be used for OLED application as emissive layer.