The Influence of Mechanical Deformation on the Optical Properties of Laminated As2S3, GeSe2 and As2Se3 Crystals

2006 ◽  
Vol 115 ◽  
pp. 251-254 ◽  
Author(s):  
A.B. Babaev ◽  
I.K. Kamilov ◽  
S.B. Sultanov ◽  
F.S. Gabibov ◽  
A.M. Askhabov
Keyword(s):  
Optical Properties ◽  
Luminescence Spectrum ◽  
Excitation Spectrum ◽  
Emission Intensity ◽  
Mechanical Treatment ◽  
Luminescence Excitation Spectrum ◽  
Mechanical Deformation ◽  
Low Energy ◽  
Configuration Model ◽  
Fatigue Effect

Reversible photostructural conversions (darkening and bleaching) attended by a shift of transmittance edge and by the photoluminescence fatigue effect are revealed. Upon mechanical treatment of crystals the maximum of the luminescence excitation spectrum shifts toward higher energies. The low-energy edge of the luminescence spectrum flattens, and emission intensity increases. The experimental results are interpreted within a configuration model of two stable structural states of molecular groups.

Optical Properties of the Niobium Centre in 4H, 6H, and 15R SiC

2013 ◽  
Vol 740-742 ◽  
pp. 405-408 ◽  
Author(s):  
Ivan G. Ivanov ◽  
Andreas Gällström ◽  
Stefano Leone ◽  
Olof Kordina ◽  
Nguyen Tien Son ◽  
...  
Keyword(s):  
Optical Properties ◽  
Luminescence Spectrum ◽  
Near Infrared ◽  
Zeeman Splitting ◽  
Photoluminescence Spectra ◽  
Model Based

A set of lines in the photoluminescence spectra of 4H-, 6H-, and 15R-SiC in the near-infrared are attributed to Nb-related defects on the ground of doping experiments conducted with 4H-SiC. A model based on a an exciton bound at the Nb-centre in an asymmetric split vacancy configuration at a hexagonal site is proposed, which explains the structure of the luminescence spectrum and the observed Zeeman splitting of the lines.

Optical properties of Cu-C70nanocomposite under low energy ion irradiation

2018 ◽  
Vol 5 (3) ◽  
pp. 035044 ◽  
Author(s):  
Rahul Singhal ◽  
Satakshi Gupta ◽  
Ritu Vishnoi ◽  
Sanjeev Aggarwal ◽  
Ganesh D Sharma ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ion Irradiation ◽  
Low Energy

Spatially resolved optical emission of cubic GaN/AlN multi-quantum well structures

2014 ◽  
Vol 1736 ◽  
Author(s):  
D.J. As ◽  
R. Kemper ◽  
C. Mietze ◽  
T. Wecker ◽  
J.K.N. Lindner ◽  
...  
Keyword(s):  
Optical Properties ◽  
Low Temperature ◽  
Film Thickness ◽  
Quantum Wells ◽  
Emission Intensity ◽  
Optical Emission ◽  
Quantum Well Structures ◽  
Spatially Resolved ◽  
Scanning Transmission ◽  
Cubic Gan

ABSTRACTIn this contribution we report on the optical properties of cubic AlN/GaN asymmetric multi quantum wells (MQW) structures on 3C-SiC/Si (001) substrates grown by radio-frequency plasma-assisted molecular beam epitaxy (MBE). Scanning transmission electron microscopy (STEM) and spatially resolved cathodoluminescence (CL) at room temperature and at low temperature are used to characterize the optical properties of the cubic AlN/GaN MQW structures. An increasing CL emission intensity with increasing film thickness due to the improved crystal quality was observed. This correlation can be directly connected to the reduction of the linewidth of x-ray rocking curves with increasing film thickness of the c-GaN films. Defects like stacking faults (SFs) on the {111} planes, which also can be considered as hexagonal inclusions in the cubic crystal matrix, lead to a decrease of the CL emission intensity. With low temperature CL line scans also monolayer fluctuations of the QWs have been detected and the observed transition energies agree well with solutions calculated using a one-dimensional (1D) Schrödinger-Poisson simulator.

Low energy excitation spectrum and Cu(2) spin-lattice relaxation from the singlet correlated band in YBa2Cu4O8

1994 ◽  
Vol 235-240 ◽  
pp. 2257-2258 ◽  
Author(s):  
R. Markendorf ◽  
M.V. Eremin ◽  
S.V. Varlamov ◽  
D. Brinkmann ◽  
M. Mali ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Lattice Relaxation ◽  
Low Energy ◽  
Spin Lattice Relaxation ◽  
Energy Excitation ◽  
Spin Lattice

Effect of Li+ doping on the quenching concentration of 2H11/2/4S3/2 level of Er3+

2014 ◽  
Vol 28 (19) ◽  
pp. 1450128 ◽  
Author(s):  
Mingzhu Yang ◽  
Lihua Mu ◽  
Haiwei Mu ◽  
Shuchen Lü
Keyword(s):  
Optical Properties ◽  
Emission Intensity ◽  
Sol Gel ◽  
Host Lattice ◽  
Gel Method ◽  
Sol Gel Method ◽  
Li Doping

Li + and Er 3+ codoped Y 2 O 3 powders are synthesized via sol–gel method. The effects of Li + doping on the optical properties of Er 3+: Y 2 O 3 are investigated under 980 nm excitation. The emission intensity of Er 3+ is obviously improved after Li + doping. Moreover, the quenching concentration of 2 H 11/2/4 S 3/2 level of Er 3+ is 3.0 mol% for the samples without Li + but it decreases to 2.0 mol% after introducing 5.0 mol% Li +. This is because Li + doping shrinks the host lattice and decreases the Er 3+– Er 3+ distance, which contribute to the formation of Er 3+ clusters and thus induces the quenching concentration of 2 H 11/2/4 S 3/2 level to decrease.

Investigations of electrical and optical properties of low energy ion irradiated α-Fe2O3 (hematite) thin films

2016 ◽  
Author(s):  
Indra Sulania ◽  
Jyoti Kaswan ◽  
Vinesh Attatappa ◽  
Ranjeet Kumar Karn ◽  
D. C. Agarwal ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Low Energy ◽  
Electrical And Optical Properties

The low-energy thermal excitation spectrum of nitrogen molecules adsorbed on Ni(1 1 0): Implications for molecular adsorption sites

1996 ◽  
Vol 62 (2) ◽  
pp. 95-101
Author(s):  
M. Bertino ◽  
W. Steinhögl ◽  
H. Range ◽  
F. Hofmann ◽  
G. Witte ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Low Energy ◽  
Molecular Adsorption ◽  
Thermal Excitation ◽  
Adsorption Sites

Tuning optical properties of atomically heterogeneous systems created by plasma-based low-energy ion beams

2020 ◽  
Vol 59 (14) ◽  
pp. 4507
Author(s):  
Krishn Pal Singh ◽  
Jayashree Majumdar ◽  
Sudeep Bhattacharjee
Keyword(s):  
Optical Properties ◽  
Heterogeneous Systems ◽  
Ion Beams ◽  
Low Energy
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