Optical Properties of Deuterium Terminated Porous Silicon

1996 ◽  
Vol 452 ◽  
Author(s):  
Takahiro Matsumoto ◽  
Yasuaki Masumoto ◽  
Nobuyoshi Koshida
Keyword(s):  
Optical Properties ◽  
Absorption Spectrum ◽  
Porous Silicon ◽  
Photoluminescence Spectrum ◽  
Porous Si ◽  
Surface Vibration ◽  
Quantum Confined

AbstractWe have studied the optical properties of deuterium-terminated porous silicon. The photoluminescence spectrum was different from that of usual hydrogen-terminated porous Si despite porous Si showing both the same structure and the same absorption spectrum. These results indicate that the surface vibration of terminated atoms couples to the quantum confined states.

Photo- and Electro-Luminescence from Deuterium Terminated Porous Silicon

1997 ◽  
Vol 486 ◽  
Author(s):  
Takahiro Matsumoto ◽  
Yasuaki Masumoto ◽  
Nobuyoshi Koshida
Keyword(s):  
Absorption Spectrum ◽  
Electrical Properties ◽  
Porous Silicon ◽  
Photoluminescence Spectrum ◽  
Degradation Mechanism ◽  
Porous Si ◽  
Oxidation Model ◽  
Electro Luminescence

AbstractWe have studied the optical and the electrical properties of deuterium-terminated porous silicon. The photoluminescence spectrum was different from that of usual hydrogen-terminated porous Si despite both porous Si showing the same structure and the same absorption spectrum. In addition to these basic results, it is found that the replacement of hydrogen with deuterium reduces the degradation not only of photoluminescence but also of electroluminescence. The luminescence degradation mechanism will be discussed from the point of a photoinduced oxidation model.

Synthesis and Fluorescence Properties of Water-Soluble L-Cysteine-Modified ZnSe:Ag Quantum Dots

2014 ◽  
Vol 1033-1034 ◽  
pp. 1172-1175
Author(s):  
Li Ping Lin ◽  
Feng Hua Huang ◽  
Pei Feng Chen
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Photoluminescence Spectrum ◽  
Water Soluble ◽  
Precipitation Method ◽  
X Ray ◽  
Surface Modifier ◽  
Co Precipitation

The water-soluble ZnSe:Ag quantum dots were synthesized in aqueous medium by chemical co-precipitation method with L-cysteine as surface modifier. The crystal structure and optical properties of the obtained ZnSe:Ag quantum dots have been characterized by X-ray power diffraction, infrared spectrum, UV-Vis absorption spectrum and photoluminescence spectrum. Results indicate that ZnSe:Ag quantum dots belong to the cubic blende structure and have good fluorescent characteristics. The L-cysteine modified on the surface of ZnSe:Ag quantum dots renders the quantum dots water-soluble, biocompatible.

Effects of Chloride Ion in TeO2-ZnO-ZnCl2-Li2O-Eu2O3 Glass System

2011 ◽  
Vol 181-182 ◽  
pp. 383-387
Author(s):  
M.R. Sahar ◽  
R. Arifin ◽  
S.K. Ghoshal
Keyword(s):  
Optical Properties ◽  
Absorption Spectrum ◽  
Intensity Ratio ◽  
Photoluminescence Spectrum ◽  
Tellurite Glass ◽  
Radiative Lifetime ◽  
Chloride Ion ◽  
Melt Quenching ◽  
Laser Material ◽  
Quenching Method

A series of zinc oxychloride tellurite glass based on (79 – z) TeO2- 10ZnO - (z) ZnCl2- 10Li2O - 1Eu2O3(where z = 0, 10, 20, 25 and 30 mol %) are successfully prepared by the melt quenching method. The optical properties are characterized by means of Raman spectra, UV-Vis and photoluminescence spectroscopy. It is found that the Raman spectrum of the glass shows three main peaks in the vibrational band in the vicinity of 430, 670 and 770 cm-1. The intensity of all bands is decreased as the ZnCl2contents are increased from 0 to 30 mol % but the intensity ratio (I770/ I670) increased. This may arise from the change in the structural chains from TeO4to TeO3+1or to a TeO3polyhedron shape. Using the UV-Vis absorption spectrum, the Judd-Ofelt (J-O) analysis is performed to determine the J-O parameters (Ω2, Ω4, Ω6) and it is found that Ω2> Ω4> Ω6. The values of Ω2, Ω4, Ω6, the quality factor (Q) and the radiative lifetime (τrad) are found to increase with ZnCl2content up to 20 mol %. From photoluminescence spectrum, it is found that the value of the intensity ratio between5D0→7F2and5D0→7F1transition increase with ZnCl2contents which illustrates that this glass can easily become laser material.

Visible Luminescence from Porous Silicon and Siloxene: Recent Results

1992 ◽  
Vol 283 ◽  
Author(s):  
H. D. Fuchs ◽  
M. Rosenbauer ◽  
M. S. Brandt ◽  
S. Ernst ◽  
S. Finkbeiner ◽  
...  
Keyword(s):  
Optical Properties ◽  
Magnetic Resonance ◽  
Porous Silicon ◽  
Time Dependent ◽  
Photoluminescence Excitation ◽  
Porous Si ◽  
Green Luminescence ◽  
Visible Luminescence ◽  
Optically Detected ◽  
Insight Into

ABSTRACTThe optical properties of porous Si (p-Si) are compared to those of siloxene and its derivatives in order to gain more insight into the mechanism of the luminescence observed in p-Si. We report new results of photoluminescence (PL), photoluminescence excitation (PLE), time-dependent and pressure-dependent photoluminescence, and optically detected magnetic resonance (ODMR). Important information about the structural, electronic, and microscopic nature of the two classes of materials are deduced from these experiments. Annealed siloxene and p-Si show very similar properties, suggesting that siloxene-related structures, e.g. electrically isolated Si6-rings, might be responsible for the luminescence in p-Si. The Si-planes in as-prepared siloxene, with their green luminescence, are metastable and are readily oxidized into red-luminescent siloxene configurations.

Photoluminescence from Single Porous Silicon Chromophores

1998 ◽  
Vol 536 ◽  
Author(s):  
M. D. Mason ◽  
G. M. Credo ◽  
K. D. Weston ◽  
S. K. Buratto
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
Porous Si ◽  
Vibronic Structure ◽  
Passivating Layer ◽  
Si Nanoparticles ◽  
Si Nanocrystal ◽  
Quantum Confined

AbstractWe spatially isolate and detect the luminescence from individual porous Si nanoparticles at room temperature. Our experiments show a variety of phenomena not previously observed in the emission from porous Si including a distribution of emission wavelengths, resolved vibronic structure, random spectral wandering, luminescence intermittency and irreversible photobleaching. Our results indicate that the emission from porous Si nanoparticles originates from excitons in quantum confined Si, strongly influenced by the surface passivating layer of the Si nanocrystal.

Variation of the optical properties of porous silicon as a result of thermal annealing in vacuum

1997 ◽  
Vol 31 (7) ◽  
pp. 704-706 ◽  
Author(s):  
V. A. Kiselev ◽  
S. V. Polisadin ◽  
A. V. Postnikov
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Thermal Annealing

Non-linear optical properties of poly(phenylene vinylene) in porous silicon substrates

2005 ◽  
Vol 2 (9) ◽  
pp. 3222-3226 ◽  
Author(s):  
T. P. Nguyen ◽  
P. Le Rendu ◽  
C. Simos ◽  
P. X. Nguyen ◽  
V. Skarka ◽  
...  
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Phenylene Vinylene ◽  
Silicon Substrates ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Linear Optical

Observation of quantum-confined luminescence in partially oxidized porous silicon

2000 ◽  
Vol 80 (4) ◽  
pp. 679-689 ◽  
Author(s):  
Giampiero Amato ◽  
L. Boarino ◽  
D. Midellino ◽  
A. M. Rossi
Keyword(s):  
Porous Silicon ◽  
Oxidized Porous Silicon ◽  
Quantum Confined

Tailoring the optical properties of tin oxide thin films via gamma irradiation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ateyyah M. Al-Baradi ◽  
Ahmed A. Atta ◽  
Ali Badawi ◽  
Saud A. Algarni ◽  
Abdulraheem S. A. Almalki ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Gamma Irradiation ◽  
Tin Oxide ◽  
Free Charge Carrier ◽  
Oxide Thin Films ◽  
Dispersion Parameters ◽  
Absorption Spectrum Fitting ◽  
Spectrum Fitting

Abstract In the current work, the optical properties of tin oxide thin films have been tailored via gamma irradiation for energy applications. The effect of Gamma radiation (50, 100, 150, 200 and 250 kGy) on the microstructural, absorption and oscillator parameters of SnO2 thin films has been investigated. XRD results reveal that the SnO2 films have the symmetry of the space group P42/mnm belonging to the tetragonal system. The crystallite size of γ-irradiated SnO2 thin film slightly increases as the irradiation dose increases. The allowed optical band gaps are estimated by applying various methods such as Tauc’s method, derivation of absorption spectrum fitting and absorption spectrum fitting approaches. The dispersion parameters are extracted from the dispersion curve of the real part of the refractive index. The single-effective-oscillator and Drude models for free charge carrier absorption are applied to obtain the dispersion parameters before and after γ-irradiation.

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