Photoluminescence spectra of thin films containing CdSe/ZnS quantum dots irradiated by 532-nm laser radiation and gamma-rays

ABSTRACTWe obtain spectrally narrow (FWHM < 40 nm) electroluminescence from nearly monodisperse CdSe nanocrystallites (quantum dots) incorporated into thin films of polyvinyl carbazole (PVK) and an oxadiazole derivative (PBD) sandwiched between aluminum and ITO electrodes. The electroluminescence and photoluminescence spectra are nearly identical at room temperature and are tunable from ∼530 nm to ∼650 nm by varying the size of the dots. Voltage studies at 77K indicate that while only the dots electroluminesce at the lower voltages, both the dots and the PVK matrix electroluminesce at higher applied voltages. Variable temperature studies indicate that the electroluminescence efficiency increases substantially as the films are cooled down to cryogenic temperatures.

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Study of Desorption Products under Laser Irradiation of the Surface of Organic Films

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.28.84 ◽

2020 ◽

Vol 28 ◽

pp. 84-90

Author(s):

Anatolij M. Turiev ◽

Inga V. Tvauri ◽

Arina T. Shanaeva

Keyword(s):

Thin Films ◽

Gallium Arsenide ◽

Laser Radiation ◽

Copper Phthalocyanine ◽

Mass Spectrometric ◽

Organic Films ◽

Molecular Fragments ◽

Organic Copper ◽

First Time ◽

532 Nm

The paper presents the results of mass spectrometric studies of laser-stimulated desorption from the surface of thin films based on organic copper phthalocyanine molecules with peripheral substituents on gallium arsenide substrates. Thin films (30-80 nm) of copper phthalocyanine with peripheral substituents in this regard are studied for the first time. The composition of particles desorbed from the surface of CuPc and CuPcF16 films by laser radiation of various wavelengths of 532 nm and 1.06 μm with a pulse duration of 10 ns was studied. The identification of the main fragments of molecules present in the desorption stream was carried out. It was shown that under the action of laser radiation, the surface is leveled and the films are fragmented, followed by desorption of molecular fragments.

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Controlling the Distribution of CdSe Colloidal Quantum Dots in Conducting Polymer Nanocomposite Thin Films Using Matrix-Assisted Pulsed Laser Evaporation

10.1557/proc-1121-n18-05 ◽

2008 ◽

Author(s):

Adrienne D. Stiff-Roberts ◽

Ryan Pate ◽

Kevin R. Lantz

Keyword(s):

Thin Films ◽

Quantum Dots ◽

Conducting Polymer ◽

Pulsed Laser ◽

Polymer Nanocomposite ◽

Colloidal Quantum Dots ◽

Laser Evaporation ◽

Nanocomposite Thin Films ◽

Conducting Polymer Nanocomposite

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Ultrastructural changes of the rabbits retina after threshold laser radiation with a wavelength of 532 nm, 577nm and 810 nm

Oftalmologicheskii Zhurnal ◽

10.31288/oftalmolzh201468994 ◽

2014 ◽

Vol 52 (6) ◽

pp. 89-94

Author(s):

N. Dumbrova ◽

◽

N. Molchanyuk ◽

T. Romanova ◽

N. Gavronskaya ◽

...

Keyword(s):

Laser Radiation ◽

Ultrastructural Changes ◽

532 Nm

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High Performance Thermoelectric Materials Using Solution Phase Synthesis of Narrow Bandgap Core/Shell Quantum Dots Deposited Into Colloidal Crystal Thin Films

10.21236/ada434970 ◽

2005 ◽

Author(s):

EVIDENT TECHNOLOGIES TROY NY

Keyword(s):

Thin Films ◽

Quantum Dots ◽

Thermoelectric Materials ◽

High Performance ◽

Colloidal Crystal ◽

Solution Phase ◽

Core Shell ◽

Phase Synthesis ◽

Solution Phase Synthesis ◽

Narrow Bandgap

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Inhomogeneous Broadening of Photoluminescence Spectra and Kinetics of Nanometer-Thick (Phenethylammonium)2PbI4 Perovskite Thin Films: Implications for Optoelectronics

ACS Applied Nano Materials ◽

10.1021/acsanm.1c00984 ◽

2021 ◽

Author(s):

Vladimir S. Chirvony ◽

Isaac Suárez ◽

Jesús Rodríguez-Romero ◽

Rubén Vázquez-Cárdenas ◽

Jesus Sanchez-Diaz ◽

...

Keyword(s):

Thin Films ◽

Inhomogeneous Broadening ◽

Photoluminescence Spectra ◽

Kinetics Of

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Effect of Growth Temperature on the Characteristics of CsPbI3-Quantum Dots Doped Perovskite Film

Molecules ◽

10.3390/molecules26154439 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4439

Author(s):

Shui-Yang Lien ◽

Yu-Hao Chen ◽

Wen-Ray Chen ◽

Chuan-Hsi Liu ◽

Chien-Jung Huang

Keyword(s):

Thin Films ◽

Thermal Stability ◽

Quantum Dots ◽

Quantum Dot ◽

Growth Temperature ◽

Electron Mobility ◽

Surface Defects ◽

Different Temperatures ◽

Pb Doping ◽

Pristine Film

In this study, adding CsPbI3 quantum dots to organic perovskite methylamine lead triiodide (CH3NH3PbI3) to form a doped perovskite film filmed by different temperatures was found to effectively reduce the formation of unsaturated metal Pb. Doping a small amount of CsPbI3 quantum dots could enhance thermal stability and improve surface defects. The electron mobility of the doped film was 2.5 times higher than the pristine film. This was a major breakthrough for inorganic quantum dot doped organic perovskite thin films.

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Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal Cdse/Cds Core/Shell Quantum Dots Ensemble

Nanomaterials ◽

10.3390/nano11051274 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1274

Author(s):

Grigor A. Mantashian ◽

Paytsar A. Mantashyan ◽

Hayk A. Sarkisyan ◽

Eduard M. Kazaryan ◽

Gabriel Bester ◽

...

Keyword(s):

Quantum Dots ◽

Raman Scattering ◽

Cross Section ◽

Core Shell ◽

Interband Absorption ◽

Photoluminescence Spectra ◽

Cds Quantum Dots ◽

Mass Approximation ◽

Numerical Discretization ◽

Size Dispersion

By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots ensemble. The interband optical absorption and photoluminescence spectra have been revealed for CdSe/CdS quantum dots, taking into account the size dispersion of the ensemble. Numerical calculation of the differential cross section has been presented for the exciton-related Stokes–Raman scattering in CdSe/CdS quantum dots ensemble with different mean sizes.

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