Synthesis and optical properties of MoS2 and isomorphous nanoclusters in the quantum confinement regime

1997 ◽  
Vol 81 (12) ◽  
pp. 7934-7944 ◽  
Author(s):  
J. P. Wilcoxon ◽  
P. P. Newcomer ◽  
G. A. Samara
Keyword(s):  
Optical Properties ◽  
Quantum Confinement

Optical Properties of Zn1-xCdxS Nanoparticles in the Quantum Confinement Regime

2010 ◽  
Vol 6 (1) ◽  
pp. 94-98 ◽  
Author(s):  
Amit Chawla ◽  
Sonal Singhal ◽  
Hari Gupta ◽  
Ramesh Chandra
Keyword(s):  
Optical Properties ◽  
Quantum Confinement

scholarly journals Strong Quantum Confinement Effect in the Optical Properties of Ultrathin α-In2Se3

2016 ◽  
Vol 4 (12) ◽  
pp. 1939-1943 ◽  
Author(s):  
Jorge Quereda ◽  
Robert Biele ◽  
Gabino Rubio-Bollinger ◽  
Nicolás Agraït ◽  
Roberto D'Agosta ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect

scholarly journals Tailoring Blue-Green Double Emissions in Carbon Quantum Dots via Co-Doping Engineering by Competition Mechanism between Chlorine-Related States and Conjugated π-Domains

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 635 ◽  
Author(s):  
Xue Sun ◽  
Huilian Liu ◽  
Lili Yang ◽  
Xinying Wang ◽  
Weiqiang Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Reaction Time ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Carbon Quantum Dots ◽  
Confinement Effect ◽  
Co Doping ◽  
Photoelectric Properties ◽  
Co Doped

Representing single-layer to tens of layers of graphene in a size less than 30 nm, carbon quantum dots (CQDs) is becoming an advanced multifunctional material for its unique optical, electronic, spin and photoelectric properties induced by the quantum confinement effect and edge effect. In present work, upon co-doping engineering, nitrogen and chlorine co-doped CQDs with uniquely strong blue-green double emissions are developed via a facile and one-pot hydrothermal method. The crystalline and optical properties of CQDs have been well manipulated by tuning the mole ratio of nitrogen/chlorine and the reaction time. The characteristic green emission centered at 512 nm has been verified, originating from the chlorine-related states, the other blue emissions centered at 460 nm are attributed to the conjugated π-domain. Increasing the proportion of 1,2,4-benzentriamine dihydrochloride can effectively adjust the bandgap of CQDs, mainly caused by the synergy and competition of chlorine-related states and the conjugated π-domain. Prolonging the reaction time promotes more nitrogen and chlorine dopants incorporate into CQDs, which inhibits the growth of CQDs to reduce the average size of CQDs down to 1.5 nm, so that the quantum confinement effect dominates into play. This work not only provides a candidate with excellent optical properties for heteroatoms-doped carbon materials but also benefits to stimulate the intensive studies for co-doped carbon with chlorine as one of new dopants paradigm.

GaSb/InGaAsSb/GaSb SINGLE AND MULTIPLE QUANTUM WELLS: OPTICAL PROPERTIES ENGINEERING AND APPLICATION

2007 ◽  
Vol 06 (05) ◽  
pp. 315-318 ◽  
Author(s):  
A. A. KOVALYOV ◽  
O. P. PCHELYAKOV ◽  
V. V. PREOBRAZHENSKII ◽  
M. M. PUTYATO ◽  
N. N. RUBTSOVA ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Quantum Confinement ◽  
Multiple Quantum Wells ◽  
Saturable Absorption ◽  
Multiple Quantum ◽  
Transmission Spectra ◽  
Single Quantum Well ◽  
Mbe Growth ◽  
High Reflection

MBE growth of GaSb / InGaAsSb / GaSb heterostructures of high crystal quality is performed under continual RHEED control. Transmission spectra of the films forming multiple quantum wells in λ ≈ 2–3 μm region confirm possibility to control optical properties of the structures through quantum confinement and through the content of semiconductor elements. New design of saturable absorption semiconductor mirror (SESAM) for Cr 2+: ZnSe laser is proposed and manufactured on the base of the single quantum well GaSb / InGaAsSb / GaSb placed between dielectric antireflection and broadband high reflection coatings.

SIMPLE QUANTUM CONFINEMENT THEORY FOR EXCITON IN INDIRECT GAP NANOSTRUCTURES

2000 ◽  
Vol 14 (15) ◽  
pp. 1559-1566 ◽  
Author(s):  
NGUYEN THI VAN OANH ◽  
NGUYEN AI VIET
Keyword(s):  
Optical Properties ◽  
Simple Model ◽  
Quantum Confinement ◽  
Tight Binding ◽  
Blue Shift ◽  
Analytic Solutions ◽  
Silicon Nanostructures ◽  
Tight Binding Approximation ◽  
Mass Approximation ◽  
Simple Quantum

We propose in this work a simple quantum confinement theory for excitons based on the effective mass approximation, for investigation of optical properties of indirect gap nanostructures. We show that using this simple model, we can get the analytic solutions and reobtain the main tight-binding approximation numerical results of Hill et al.1 for silicon nanostructures: blue shift of band gap and increase overlap between the states at the band edges when the nanostructures size in decreased.

Properties of Nanostructure Formed on SiO2/Si Interface by Laser Radiation

2007 ◽  
Vol 131-133 ◽  
pp. 559-562 ◽  
Author(s):  
Arthur Medvid ◽  
Igor Dmitruk ◽  
Pavels Onufrijevs ◽  
Iryna Pundyk
Keyword(s):  
Optical Properties ◽  
Laser Radiation ◽  
Band Gap ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Visible Range ◽  
Pulsed Nd:Yag Laser ◽  
Self Organized ◽  
Graded Band Gap

The aim of this work is to study optical properties of Si nanohills formed on the SiO2/Si interface by the pulsed Nd:YAG laser radiation. Nanohills which are self-organized on the surface of Si, are characterized by strong photoluminescence in the visible range of spectra with long wing in the red part of spectra. This peculiarity is explained by Quantum confinement effect in nanohillsnanowires with graded diameter. We have found a new method for graded band gap semiconductor formation using an elementary semiconductor. Graded change of band gap arises due to Quantum confinement effect.

The role of surface vibrations and quantum confinement effect to the optical properties of very thin nanocrystalline silicon films

2007 ◽  
Vol 102 (8) ◽  
pp. 083534 ◽  
Author(s):  
Emmanouil Lioudakis ◽  
Antreas Antoniou ◽  
Andreas Othonos ◽  
Constantinos Christofides ◽  
A. G. Nassiopoulou ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Nanocrystalline Silicon ◽  
Silicon Films ◽  
Confinement Effect ◽  
Surface Vibrations ◽  
Nanocrystalline Silicon Films

QUANTUM CONFINEMENT EFFECTS ON THE OPTICAL PROPERTIES OF ION BEAM SPUTTERED NICKEL OXIDE THIN FILMS

2001 ◽  
Vol 15 (02) ◽  
pp. 191-200 ◽  
Author(s):  
M. GHANASHYAM KRISHNA ◽  
A. K. BHATTACHARYA
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Nickel Oxide ◽  
Band Gap ◽  
Quantum Confinement ◽  
Ion Beam ◽  
Confinement Effects ◽  
Oxide Thin Films ◽  
Quantum Confinement Effects ◽  
Nickel Oxide Thin Films

Quantum confinement effects on the optical properties of ion beam sputtered nickel oxide thin films are reported. Thin films with crystallite sizes in the range 9 to 14 nm have been deposited on to fused silica substrates. There is an increase in band gap, from 3.4 to 3.9 eV, and a decrease in refractive index, from 2.4 to 1.6, with decrease in crystallite size, that can be attributed to quantum confinement effects. The effective mass approximation has been used to explain the observed behaviour in band gap variation.

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