scholarly journals Ultraviolet Stimulated Emission from Sol-Gel Spin Coated ZnO Thin Films

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmed S. Razeen ◽  
A.-S. Gadallah ◽  
M. M. El-Nahass
Keyword(s):  
Thin Films ◽  
Quantum Efficiency ◽  
Spin Coating ◽  
Sol Gel ◽  
Optical Excitation ◽  
Stimulated Emission ◽  
Zno Thin Films ◽  
Input Output ◽  
Output Intensity ◽  
Intensity Dependence

Low cost ultraviolet stimulated emission has been generated using optical excitation of ZnO thin films deposited by sol-gel spin coating on n+As-doped100Si-substrate. The number of deposited layers and the heat treatment have been investigated to obtain a film that can generate stimulated emission under optical excitation. The optimum condition for preparation of the film has been presented. X-ray diffraction and scanning electron microscope have been used for structural and morphological investigations. Input-output intensity dependence and spectral width, peak emission wavelength, and the quantum efficiency versus the pump intensity have been presented. A quantum efficiency of about 24.2% has been reported, a power exponent higher than 8 has been obtained in input-output intensity dependence, and a threshold of about 23 Mw/cm2has been evaluated for the samples. The mechanism by which stimulated emission occurs has been discussed. The results show that sol-gel spin coating is a promising method for generating ultraviolet stimulated emission from ZnO thin films.

scholarly journals Preparation of Glass Plate-Supported Nanostructure ZnO Thin Film Deposited by Sol-Gel Spin-Coating Technique and Its Photocatalytic Degradation to Monoazo Textile Dye

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Mohammad Hossein Habibi ◽  
Mohammad Khaledi Sardashti
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Degradation ◽  
Spin Coating ◽  
Sol Gel ◽  
Glass Plate ◽  
Zno Thin Films ◽  
Visible Range ◽  
Textile Dye ◽  
Axis Orientation

Glass plate-supported nanostructure ZnO thin films were deposited by sol-gel spin coating. Films were preheated at275∘Cfor 10 minutes and annealed at 350, 450, and550∘Cfor 80 minutes. The ZnO thin films were transparent ca 80–90% in visible range and revealed that absorption edges at about 370 nm. Thec-axis orientation improves and the grain size increases which was indicated by an increase in intensity of the (002) peak at34.4∘in XRD corresponding to the hexagonal ZnO crystal. The photocatalytic degradation of X6G an anionic monoazo dye, in aqueous solutions, was investigated and the effects of some operational parameters such as the number of layer and reusability of ZnO nanostructure thin film were examined. The results showed that the five-layer coated glass surfaces have a very high photocatalytic performance.

Multifractal analysis of Mg‐doped ZnO thin films deposited by sol–gel spin coating method

2021 ◽  
Author(s):  
Ştefan Ţălu ◽  
Samah Boudour ◽  
Idris Bouchama ◽  
Bandar Astinchap ◽  
Hamta Ghanbaripour ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Multifractal Analysis ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Spin Coating Method ◽  
Coating Method ◽  
Doped Zno ◽  
Mg Doped

Optical Properties of Nanostructured Zinc Oxides Deposited on Silicon Substrates

2011 ◽  
Vol 312-315 ◽  
pp. 1132-1136 ◽  
Author(s):  
Mohamad Hafiz Mamat ◽  
Zuraida Khusaimi ◽  
Mohamad Mahmood Rusop
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Silicon Substrates ◽  
Annealing Temperatures ◽  
Uv Emission ◽  
Zinc Oxides ◽  
Optically Transparent

Nanostructured zinc oxide (ZnO) thin films were prepared through sol-gel method and spin-coating technique. ZnO thin films then were annealed at temperature of 350°C, 400°C, 450°C and 500°C. The thin films were characterized using field emission scanning electron microscope (FESEM), UV-VIS-NIR spectrophotometer and photoluminescence (PL) spectrofluorometer for morphology and optical properties study. The morphology study indicates that the particle size of ZnO increased with annealing temperatures. All thin films are optically transparent (~ 80 % in transmittance) in the visible light-NIR region. PL spectra reveal improved UV emission with annealing temperatures up to 500°C.

Effect of different sol concentrations on the properties of nanocrystalline ZnO thin films grown on FTO substrates by sol-gel spin-coating

2014 ◽  
Vol 65 (4) ◽  
pp. 480-486 ◽  
Author(s):  
Ikhyun Kim ◽  
Younggyu Kim ◽  
Giwoong Nam ◽  
Dongwan Kim ◽  
Minju Park ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Sol Gel ◽  
Zno Thin Films

scholarly journals (0 0 2)-oriented growth and morphologies of ZnO thin films prepared by sol-gel method

2016 ◽  
Vol 34 (3) ◽  
pp. 555-563 ◽  
Author(s):  
Dongyun Guo ◽  
Yang Ju ◽  
Chengju Fu ◽  
Zhixiong Huang ◽  
Lianmeng Zhang
Keyword(s):  
Thin Films ◽  
Mechanical Stress ◽  
Spin Coating ◽  
Zinc Acetate ◽  
Sol Gel ◽  
Boiling Temperature ◽  
Zno Thin Films ◽  
Oriented Growth ◽  
Gel Method ◽  
Coating Method

AbstractZinc acetate was used as a starting material to prepare Zn-solutions from solvents and ligands with different boiling temperature. The ZnO thin films were prepared on Si(1 0 0) substrates by spin-coating method. The effect of baking temperature and boiling temperature of the solvents and ligands on their morphologies and orientation was investigated. The solvents and ligands with high boiling temperature were favorable for relaxation of mechanical stress to form the smooth ZnO thin films. As the solvents and ligands with low boiling temperature were used to prepare Zn-solutions, the prepared ZnO thin films showed (0 0 2) preferred orientation. As n-propanol, 2-methoxyethanol, 2-(methylamino)ethanol and monoethanolamine were used to prepare Zn-solutions, highly (0 0 2)-oriented ZnO thin films were formed by adjusting the baking temperature.

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