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Article ; Online: Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid.

Abumosa, Rasha A / Al-Asbahi, Bandar Ali / AlSalhi, Mohamad Saleh

2017 Volume 9, Issue 2

Abstract: The influence of the solvent nature on optical properties of poly[2-methoxy-5-3,7-dimethyloctyloxy-1,4-phenylenevinylene] (MDMO-PPV)/Coumarine 500 (C500) have been investigated. In addition, the amplified spontaneous emission (ASE) from MDMO-PPV and ... ...

Abstract	The influence of the solvent nature on optical properties of poly[2-methoxy-5-3,7-dimethyloctyloxy-1,4-phenylenevinylene] (MDMO-PPV)/Coumarine 500 (C500) have been investigated. In addition, the amplified spontaneous emission (ASE) from MDMO-PPV and efficient energy transfer between the MDMO-PPV and C500 has been verified. The MDMO-PPV was dissolved in aromatic and nonaromatic solvents, while the solution blending method was employed to prepare the MDMO-PPV:C500 hybrid. The quantum yield of the MDMO-PPV was found to increase with the reduction of a few factors such as polarity index of the solvent, absorption cross section (σ
Language	English
Publishing date	2017-02-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym9020071
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Time Evolution of the Excimer State of a Conjugated Polymer Laser.

Mujamammi, Wafa Musa / Prasad, Saradh / Saleh AlSalhi, Mohamad / Masilamani, Vadivel

Polymers

2017 Volume 9, Issue 12

Abstract: An excited dimer is an important complex formed in nano- or pico-second time scales in many photophysics and photochemistry applications. The spectral and temporal profile of the excimer state of a laser from a new conjugated polymer, namely, poly (9,9- ... ...

Abstract	An excited dimer is an important complex formed in nano- or pico-second time scales in many photophysics and photochemistry applications. The spectral and temporal profile of the excimer state of a laser from a new conjugated polymer, namely, poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO), under several concentrations in benzene were investigated. These solutions were optically pumped by intense pulsed third-harmonic Nd:YAG laser (355-nm) to obtain the amplified spontaneous emission (ASE) spectra of a monomer and an excimer with bandwidths of 6 and 7 nm, respectively. The monomer and excimer ASEs were dependent on the PFO concentration, pump power, and temperature. Employing a sophisticated picosecond spectrometer, the time evolution of the excimer state of this polymer, which is over 400 ps, can be monitored.
Language	English
Publishing date	2017-11-27
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym9120648
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Enhanced Optoelectronic Properties of PFO/Fluorol 7GA Hybrid Light Emitting Diodes via Additions of TiO₂ Nanoparticles.

Al-Asbahi, Bandar Ali / Haji Jumali, Mohammad Hafizuddin / AlSalhi, Mohamad Saleh

Polymers

2016 Volume 8, Issue 9

Abstract: The effect of TiO₂ nanoparticle (NP) content on the improvement of poly(9,9'-di- ...

Abstract	The effect of TiO₂ nanoparticle (NP) content on the improvement of poly(9,9'-di-
Language	English
Publishing date	2016-09-06
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym8090334
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: 3D nanorhombus nickel nitride as stable and cost-effective counter electrodes for dye-sensitized solar cells and supercapacitor applications.

Prasad, Saradh / Durai, G / Devaraj, D / AlSalhi, Mohamad Saleh / Theerthagiri, J / Arunachalam, Prabhakarn / Gurulakshmi, M / Raghavender, M / Kuppusami, P

RSC advances

2018 Volume 8, Issue 16, Page(s) 8828–8835

Abstract: Transition metal nitride based materials have attracted significant interest owing to their excellent properties and multiple applications in the field of electrochemical energy conversion and storage devices. Herein we synthesize 3D nanorhombus nickel ... ...

Abstract	Transition metal nitride based materials have attracted significant interest owing to their excellent properties and multiple applications in the field of electrochemical energy conversion and storage devices. Herein we synthesize 3D nanorhombus nickel nitride (Ni
Language	English
Publishing date	2018-02-27
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/c8ra00347e
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser.

Prasad, Saradh / AlHesseny, Hanan Saleh / AlSalhi, Mohamad S / Devaraj, Durairaj / Masilamai, Vadivel

Nanomaterials (Basel, Switzerland)

2017 Volume 7, Issue 2

Abstract: Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. ... ...

Abstract	Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit very poor chemical stability. As new tunable, efficient lasers are always in demand, one such laser is designed with various sized CdSe/ZnS quantum dots. They were used as a colloid in tetrahydrofuran to produce a fluorescent broadband emission from 520 nm to 630 nm. The second (532 nm) and/or third harmonic (355 nm) of the Nd:YAG laser (10 ns, 10 Hz) were used together as the pump source. In this study, different sized quantum dots were independently optically pumped to produce amplified spontaneous emission (ASE) with 4 nm to 7 nm of full width at half-maximum (FWHM), when the pump power and focusing were carefully optimized. The beam was directional with a 7 mrad divergence. Subsequently, these quantum dots were combined together, and the solution was placed in a resonator cavity to obtain a laser with a spectral width of 1 nm and tunable from 510 to 630 nm, with a conversion efficiency of about 0.1%.
Language	English
Publishing date	2017-01-30
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano7020029
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Time Evolution of the Excimer State of a Conjugated Polymer Laser

Wafa Musa Mujamammi / Saradh Prasad / Mohamad Saleh AlSalhi / Vadivel Masilamani

Polymers, Vol 9, Iss 12, p

2017 Volume 648

Abstract	An excited dimer is an important complex formed in nano- or pico-second time scales in many photophysics and photochemistry applications. The spectral and temporal profile of the excimer state of a laser from a new conjugated polymer, namely, poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO), under several concentrations in benzene were investigated. These solutions were optically pumped by intense pulsed third-harmonic Nd:YAG laser (355-nm) to obtain the amplified spontaneous emission (ASE) spectra of a monomer and an excimer with bandwidths of 6 and 7 nm, respectively. The monomer and excimer ASEs were dependent on the PFO concentration, pump power, and temperature. Employing a sophisticated picosecond spectrometer, the time evolution of the excimer state of this polymer, which is over 400 ps, can be monitored.
Keywords	conjugated polymer (PFO) ; UV laser ; amplified spontaneous emission spectra (ASE) ; time resolved study ; Organic chemistry ; QD241-441
Language	English
Publishing date	2017-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A High Power, Frequency Tunable Colloidal Quantum Dot (CdSe/ZnS) Laser

Saradh Prasad / Hanan Saleh AlHesseny / Mohamad S. AlSalhi / Durairaj Devaraj / Vadivel Masilamai

Nanomaterials, Vol 7, Iss 2, p

2017 Volume 29

Abstract	Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit very poor chemical stability. As new tunable, efficient lasers are always in demand, one such laser is designed with various sized CdSe/ZnS quantum dots. They were used as a colloid in tetrahydrofuran to produce a fluorescent broadband emission from 520 nm to 630 nm. The second (532 nm) and/or third harmonic (355 nm) of the Nd:YAG laser (10 ns, 10 Hz) were used together as the pump source. In this study, different sized quantum dots were independently optically pumped to produce amplified spontaneous emission (ASE) with 4 nm to 7 nm of full width at half-maximum (FWHM), when the pump power and focusing were carefully optimized. The beam was directional with a 7 mrad divergence. Subsequently, these quantum dots were combined together, and the solution was placed in a resonator cavity to obtain a laser with a spectral width of 1 nm and tunable from 510 to 630 nm, with a conversion efficiency of about 0.1%.
Keywords	quantum dots CdSe/ZnS ; amplified spontaneous emission ; spectral properties ; broad tunable laser from 520 to 630 nm ; Chemistry ; QD1-999
Subject code	530
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Optical Properties and Amplified Spontaneous Emission of Novel MDMO-PPV/C500 Hybrid

Rasha A. Abumosa / Bandar Ali Al-Asbahi / Mohamad Saleh AlSalhi

Polymers, Vol 9, Iss 2, p

2017 Volume 71

Abstract	The influence of the solvent nature on optical properties of poly[2-methoxy-5-3,7-dimethyloctyloxy-1,4-phenylenevinylene] (MDMO-PPV)/Coumarine 500 (C500) have been investigated. In addition, the amplified spontaneous emission (ASE) from MDMO-PPV and efficient energy transfer between the MDMO-PPV and C500 has been verified. The MDMO-PPV was dissolved in aromatic and nonaromatic solvents, while the solution blending method was employed to prepare the MDMO-PPV:C500 hybrid. The quantum yield of the MDMO-PPV was found to increase with the reduction of a few factors such as polarity index of the solvent, absorption cross section (σa), emission cross section (σe), and extinction coefficient (εmax). The fluorescence spectra of the MDMO-PPV appears from two vibronic band transitions (0-0, 0-1) and the ASE occurs at 0-1 transition, which was verified by the ASE from MDMO-PPV. The MDMO-PPV in toluene exhibited the best ASE efficiency due to its high quantum yield compared with other solvents. Strong overlap between the absorption spectrum of MDMO-PPV and emission spectrum of C500 confirmed the efficient energy transfer between them. Moreover, the ASE for energy transfer of the MDMO-PPV:C500 hybrid was proved.
Keywords	optical properties ; quantum yield ; amplified spontaneous emission ; energy transfer ; Organic chemistry ; QD241-441
Subject code	530
Language	English
Publishing date	2017-02-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Smoking Induced Hemolysis: Spectral and microscopic investigations.

Masilamani, Vadivel / AlZahrani, Khalid / Devanesan, Sandhanasamy / AlQahtani, Hadi / AlSalhi, Mohamad Saleh

Scientific reports

2016 Volume 6, Page(s) 21095

Abstract: Smoking is one of the major causes of lifestyle associated mortality and morbidity such as cancer of the oral cavity and lungs, and also cardiovascular diseases. In this study, we have provided evidences for the smoking-induced hemolysis using two ... ...

Abstract	Smoking is one of the major causes of lifestyle associated mortality and morbidity such as cancer of the oral cavity and lungs, and also cardiovascular diseases. In this study, we have provided evidences for the smoking-induced hemolysis using two methods: spectra of blood components and atomic force microscopic analysis of surface morphology. A total of 62 subjects (control = 31; smoker = 31: 21 male; 10 female in each set) were considered for the study. The findings indicate that smoking leads to potholes on the surface, swelling of shape, rupturing of erythrocytes, removal of hematoporphyrin and flushing into the plasma as metabolites of the erythrocyte. The overall morphology of the erythrocytes of the smoker group appears more like a Mexican hat. The mean surface roughness was 5.5 ± 3 nm for the smoker group, but 1.2 ± 0.2 nm for the control group. Such damages might help the toxins, (CO, peroxidants, aldehydes etc.,) to gain easy access and get strongly absorbed by the hemoglobin, leading to enhanced rates of hemolysis as shown by the spectral features of metabolites. This indicates that the average life span of the smoker's erythrocytes is significantly less than that of the control group.
MeSH term(s)	Erythrocyte Membrane/pathology ; Erythrocytes/metabolism ; Erythrocytes/pathology ; Female ; Hemolysis ; Humans ; Male ; Microscopy/methods ; Microscopy, Atomic Force ; NAD/metabolism ; Smoking/adverse effects ; Spectrometry, Fluorescence
Chemical Substances	NAD (0U46U6E8UK)
Language	English
Publishing date	2016-02-19
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/srep21095
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Enhanced Optoelectronic Properties of PFO/Fluorol 7GA Hybrid Light Emitting Diodes via Additions of TiO2 Nanoparticles

Bandar Ali Al-Asbahi / Mohammad Hafizuddin Haji Jumali / Mohamad Saleh AlSalhi

Polymers, Vol 8, Iss 9, p

2016 Volume 334

Abstract: The effect of TiO2 nanoparticle (NP) content on the improvement of poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO)/Fluorol 7GA organic light emitting diode (OLED) performance is demonstrated here. The PFO/Fluorol 7GA blend with specific ratios of TiO2 NPs ... ...

Abstract	The effect of TiO2 nanoparticle (NP) content on the improvement of poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO)/Fluorol 7GA organic light emitting diode (OLED) performance is demonstrated here. The PFO/Fluorol 7GA blend with specific ratios of TiO2 NPs was prepared via a solution blending method before being spin-coated onto an indium tin oxide (ITO) substrate to act as an emissive layer in OLEDs. A thin aluminum layer as top electrode was deposited onto the emissive layer using the electron beam chamber. Improvement electron injection from the cathode was achieved upon incorporation of TiO2 NPs into the PFO/Fluorol 7GA blend, thus producing devices with intense luminance and lower turn-on voltage. The ITO/(PFO/Fluorol 7GA/TiO2)/Al OLED device exhibited maximum electroluminescence intensity and luminance at 25 wt % of TiO2 NPs, while maximum luminance efficiency was achieved with 15 wt % TiO2 NP content. In addition, this work proved that the performance of the devices was strongly affected by the surface morphology, which in turn depended on the TiO2 NP content.
Keywords	poly(9,9′-di-n-octylfluorenyl-2,7-diyl) (PFO)/Fluorol 7GA blend ; organic light emitting diode (OLED) ; electroluminescence ; turn-on voltage ; luminance efficiency ; Organic chemistry ; QD241-441
Subject code	620
Language	English
Publishing date	2016-09-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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