Europium doping of cadmium selenide (CdSe) quantum dots via rapid microwave synthesis for optoelectronic applications

2022 ◽  
Author(s):  
Donovan Thomas ◽  
Harold O. Lee ◽  
Kevin C. Santiago ◽  
Marvin Pelzer ◽  
Ayodeji Kuti ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Energy Transfer ◽  
Cadmium Selenide ◽  
Microwave Synthesis ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Europium Doping ◽  
Vis Spectroscopy ◽  
Tunable Optical Properties

UV-Vis spectroscopy and PL data show that structural incorporation of Eu3+ has an effect on the optical properties of CdSe QDs via energy transfer from host to dopant. This allows for QDs with tunable optical properties via numerous pathways.

HIGHLY ORDERED MICRO-ARRAYS OF CdSe QUANTUM DOTS ON CHEMICALLY PATTERNED SUBSTRATES

2009 ◽  
Vol 08 (01n02) ◽  
pp. 119-122
Author(s):  
LI ZHANG ◽  
HUA-YAN SI ◽  
HUA XU ◽  
HAO-LI ZHANG ◽  
YU-QING XIONG
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Self Assembly ◽  
Microcontact Printing ◽  
Cdse Quantum Dots ◽  
Two Dimensional ◽  
Liquid Interfaces ◽  
Patterned Substrates ◽  
Cdse Qds ◽  
Ordered Arrays

Highly ordered arrays consisting uniform fluorescent cadmium selenide ( CdSe ) quantum dots (QDs) ring or dot structures were obtained by self-assembly of QDs on chemically patterned substrates. In this method, Au substrates with alternating hydrophobic and hydrophilic square patterns are firstly fabricated by microcontact printing, which allows water droplets to condense on the hydrophilic regions to provide two-dimensional template arrays. The CdSe QDs are then assembled at the liquid/liquid interfaces to give uniform micro or nanostructures. The shape and size of the rings and dots can be tailored by controlling the relative evaporation speed of the water and the organic solvents. The obtained nanostructures have ideal topography to avoid substrate-induced fluorescence quenching.

scholarly journals Rapid Microwave Synthesis of Tunable Cadmium Selenide (CdSe) Quantum Dots for Optoelectronic Applications

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Donovan Thomas ◽  
Harold O. Lee ◽  
Kevin C. Santiago ◽  
Marvin Pelzer ◽  
Ayodeji Kuti ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Microwave Synthesis ◽  
Growth Process ◽  
Synthesis Method ◽  
Optoelectronic Devices ◽  
Optoelectronic Device ◽  
Cdse Qds ◽  
Emission Profile ◽  
Wide Range

Quantum dots (QDs) are a hot topic in optoelectronic device research, due to tailorable absorption and emission properties. Unfortunately, the conventional methods of QD synthesis are hazardous and time-consuming. In this work, we present an alternative method of fabricating cadmium selenide (CdSe) QDs (via rapid microwave synthesis). This novel fabrication method provides a quick and efficient way to synthesize QDs that are almost identical to those commercially available. We also demonstrate the tuning of QD sizes by varying time and temperature during the growth process. Optical spectroscopy was used to measure the emission profile of QDs of various sizes. With ease repeatability, tunability, and scalability, this QD synthesis method can be integrated into a wide range of applications and optoelectronic devices.

Microwave synthesis of bis(cycloalkeno)-1,4-diselenins: a novel source of Se for CdSe QDs

2017 ◽  
Vol 41 (15) ◽  
pp. 7438-7446 ◽  
Author(s):  
Aditi A. Jadhav ◽  
Priyesh V. More ◽  
Pawan K. Khanna
Keyword(s):  
Quantum Dots ◽  
Microwave Irradiation ◽  
Microwave Synthesis ◽  
Microwave Method ◽  
Cdse Quantum Dots ◽  
Microwave Irradiation Method ◽  
Cdse Qds ◽  
First Time

This paper describes the formation of a series of bis(cycloalkeno)-1,4-diselenins from the corresponding cycloalkeno-1,2,3-selenadiazoles by a microwave irradiation method. Additionally, for the first time ever, bis(cyclohepteno)-1,4-diselenin has been utilised as a novel selenium precursor for the preparation of CdSe quantum dots (QDs) by a microwave method.

Effects of Ag doping on the electronic and optical properties of CdSe quantum dots

2019 ◽  
Vol 21 (29) ◽  
pp. 16108-16119 ◽  
Author(s):  
F. A. Zhao ◽  
H. Y. Xiao ◽  
X. M. Bai ◽  
X. T. Zu
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cadmium Selenide ◽  
Cdse Nanocrystals ◽  
Cdse Quantum Dots ◽  
Electronic And Optical Properties ◽  
Ag Doping

Cadmium selenide (CdSe) nanocrystals are important photoelectric materials.

scholarly journals Investigation on Surface Properties of Mn-Doped CdSe Quantum Dots Studied by X-ray Photoelectron Spectroscopy

Symmetry ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1250 ◽  
Author(s):  
Hamizi ◽  
Johan ◽  
Abdul Wahab ◽  
Chowdhury ◽  
Akbarzadeh Pivehzhani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Cadmium Selenide ◽  
Photoelectron Spectroscopy ◽  
Organic Ligand ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
X Ray ◽  
Inverse Micelle ◽  
Mn Doped

In this work, we report on the effects of incorporating manganese (Mn) dopant into different sizes of cadmium selenide (CdSe) quantum dots (QDs), which improves the electronic and optical properties of the QDs for multiple applications such as light-emitting diodes, lasers, and biological labels. Furthermore, the greener inverse Micelle method was implemented using organic ligand, which is oleic acid. This binding of the surface enhanced the QDs’ surface trap passivation of Mn-doped CdSe, which then increased the quantity of the output. In addition, the inverse Micelle technique was used successfully to dope Mn into CdSe QDs without the risk of Mn dopants being self-purified as experienced by wurtzite CdSe QDs. Also, we report the X-ray photoelectron spectroscopy (XPS) results and analysis of zinc blended manganese-doped cadmium selenide quantum dots (Mn-doped CdSe QDs), which were synthesized with physical sizes that varied from 3 to 14 nm using the inverse Micelle method. The XPS scans traced the existence of the Se 3d and Cd 3d band of CdSe crystals with a 54.1 and 404.5 eV binding energy. The traced 640.7 eV XPS peak is proof that Mn was integrated into the lattice of CdSe QDs. The binding energy of the QDs was related to the increase in the size of the QDs.

scholarly journals Studies of Nucleation Phase of Mn-doped Cadmium-Selenide (CdSe) Quantum Dots Via Photoluminescence Spectroscopy

2021 ◽  
Vol 1 (1) ◽  
pp. 64-70
Author(s):  
Nor Aliya Hamizi ◽  
Ahmad Bayhaki Sadidarto ◽  
Mohd Rafie Johan ◽  
Hairul Anuar Tajuddin ◽  
Zaira Zaman Chowdhury ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Reaction Temperature ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Physical Size ◽  
Pl Spectra ◽  
Different Temperatures ◽  
Nucleation Phase ◽  
Mn Doped

In this paper, we predict the nucleation phase of as-synthesized manganese (Mn) doped cadmium selenide (CdSe) quantum dots (QDs) at an intrinsic physical size of 3 (± 0.1 – 0.9) nm via photoluminescence (PL) studies. The nucleation phase was analyzed at temporal evolution (16, 46 and 90 mins) and temperature (210, 215 and 220 ºC) below the CdSe QDs reaction temperature (210 and 215 ºC) to it reaction temperature (220 ºC). The PL spectra`s observed to be against the QDs ripening behaviour of QDs since there are no prominent red-shift of PL spectra`s. However, the intensity of PL spectra`s shows to be varied with different temperatures and times.

Charge and Energy Transfer Between CdSe Quantum Dots and Polyaniline

2016 ◽  
Vol 16 (4) ◽  
pp. 3909-3913 ◽  
Author(s):  
Liang Xu ◽  
Xingbin Huang ◽  
Wenjiang Dai ◽  
Punan Sun ◽  
Xuanlin Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cdse Quantum Dots ◽  
Time Resolved Fluorescence ◽  
Cdse Qds ◽  
Time Resolved ◽  
Two Factors

CdSe quantum dots (QDs) and polyaniline (PAni) were mixed to prepare CdSe QDs/PAni complex. PAni can quench the fluorescence of CdSe QDs. Fluorescence intensity of CdSe QDs/PAni complex is related to the size of CdSe QDs and the concentration of PAni. UV-Vis absorption spectra, fluorescence spectra, time-resolved fluorescence spectroscopy were used to analys the quenching phenomenon. The mechanism of fluorescence quenching is dependent on two factors: on one hand, the Förster resonance energy transfer from CdSe to PAni; on the other hand, PAni can intercept the charge relaxation process of CdSe and lead to the interruption of radiative recombination.

scholarly journals Tunable optical properties of Mn-doped CdSe quantum dots synthesized via inverse micelle technique

2016 ◽  
Vol 6 (9) ◽  
pp. 2915 ◽  
Author(s):  
Nor Aliya Hamizi ◽  
Fatihah Aplop ◽  
Hor Yuen Haw ◽  
Ahmad Najmudin Sabri ◽  
Au Yong Yu Wern ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cdse Quantum Dots ◽  
Inverse Micelle ◽  
Tunable Optical Properties ◽  
Mn Doped

scholarly journals Intense Visible Luminescence in CdSe Quantum Dots by Efficiency Surface Passivation with H2O Molecules

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Hyeoung Woo Park ◽  
Do-Hyung Kim
Keyword(s):  
Heat Treatment ◽  
Quantum Dots ◽  
Quantum Yield ◽  
Surface Passivation ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Effect Of Water ◽  
Visible Luminescence ◽  
Luminescence Efficiency

We have investigated the effect of water (H2O) cooling and heat treatment on the luminescence efficiency of core CdSe quantum dots (QDs). The photoluminescence (PL) quantum yield of the CdSe QDs was enhanced up to ~85%, and some periodic bright points were observed in wide color ranges during the heat treatment of QDs mixed with H2O. The PL enhancement of QDs could be attributed to the recovery of QDs surface traps by unreacted ligands confined within the hydrophilic H2O molecule containers.

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