Tunable narrow emission in ZnS/CdS/ZnS quantum well structures prepared by aqueous route

Kumar, Hitanshu; Kumari, Asha; Singh, Ragini Raj

doi:10.1016/j.optmat.2017.04.009

Cited by 16 publications

(8 citation statements)

References 39 publications

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“…At present, XRD was employed in three types of diffraction techniques containing, powder diffraction, singlecrystal XRD, and grazing incidence angle diffraction. A black and white X-ray beam of light is used in these experiments [36]. XRD pattern is an acceptable approach to estimate the structural and phase characteristics of single crystals and/or polycrystalline components.…”

Section: Introductionmentioning

confidence: 99%

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

Madhavi

2019

SN Appl. Sci.

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The paper deals with the exhaustive study and analysis of VO 2+ ions doped ZnS/CdS composite nanopowder with the help of X-ray peak profile analysis (XPPA). The investigation has been carried out by applying a distinct pattern of Williamson-Hall (W-H) approach viz., uniform deformation model, the uniform stress deformation model and uniform deformation energy density model, and size strain plot (SSP). Fourier transforms infrared spectroscopy (FT-IR), scanning electron microscope and energy dispersive spectra (EDS) and transmission electron microscope (TEM) techniques. The XRD study is high manipulated order and fundamental focus is on phase identification, with some analysis on advanced concepts such as crystallite size and lattice strain have been estimated using the modified form of the W-H methods. XRD pattern confirmed that the structure of the sample belongs to the cubic system. The variation of lattice constant (a) with dopant is assigned to Vegard's law. The root means square strain was identified from the interionic separation and lattice strain assumed on W-H models. FT-IR spectrum exhibited characteristic vibrational modes of Zn and Cd ions along with other bands. EDS analysis gives information about the elemental composition in the present sample. The shape of VO 2+ ions doped ZnS/CdS composite nanopowder was spherical in TEM images. The result showed that there was a good agreement in the particle size obtained from the W-H method and the SSP method with TEM images.

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Section: Introductionmentioning

confidence: 99%

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

Madhavi

2019

SN Appl. Sci.

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“…Многослойные КТ (МКТ), содержащие два и более слоя, нанесенных на ядро, обладают высоким квантовым выходом люминесценции с увеличенным временем жизни возбужденных состояний. Кроме того, они меньше подвержены фотоокислению, для них характерно улучшение структурных свойств [2,3,[23][24][25][26]. Большинство из них синтезированы методами ионного наслаивания на подложке [27,28] или химического осаждения в водной или органической среде [26,[29][30][31][32][33][34].…”

Section: Introductionunclassified

Фотолюминесценция низкоразмерных композитных структур полиметилметакрилат/(Zn,Cd,Mn,Eu)S

Smagin¹,

Исаева²

2021

Журнал Технической Физики

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A colloidal technology for the synthesis and doping of low-dimensional structures based on zinc and cadmium sulfides directly in the medium of an acrylic monomer is implemented in the process of obtaining optically transparent compositions of polymethylmethacrylate/(Zn,Cd,Mn,Eu)S. It is shown that the photoluminescence of the compositions is associated with a system of levels of structural defects of semiconductor particles located in its band gap, which are formed during successive doping of ZnS and CdS layers with Mn2+ and Eu3+ ions, and with intraband 5D0 → 7F1,2,4 transitions of 4f-electrons of Eu3+ ions. Photoluminescence excitation it occurs as a result of the transition of electrons from the valence band of a semiconductor to the levels of defects in its structure and partial energy transfer to the excited energy levels of Eu3+ ions.

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“…Одним из способов минимизации напряжений в пограничном слое между ядром и оболочкой при несоответствии их кристаллографических параметров является формирование промежуточного слоя. Для этого реализуются различные варианты чередования полупроводников, различающихся шириной запрещенной зоны [3,[8][9][10][11].…”

Section: Introductionunclassified

“…Впервые в качестве " адаптеров несоответствий решетки" в системах " ядро/оболочка/оболочка" были применены CdS или ZnSe в системе CdSe/ZnS [22,23]. Примерами подобных структур также являются нанокристаллы CdS/HgS/CdS [8], ZnS/CdS/ZnS [11]. Большинство многослойных структур синтезированы методами ионного наслаивания на подложке [24,25] и химическим осаждением из растворов [11,[26][27][28][29].…”

Section: Introductionunclassified

Синтез И Фотолюминесценция Наноразмерных Структур На Основе Сульфидов Цинка, Кадмия И Марганца В Полиакрилатной Матрице

Исаева¹,

Смагин²

2020

Физика И Техника Полупроводников

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Photoluminescence of nanoscale structures based on zinc, cadmium and manganese sulfides depending on the conditions of synthesis and doping in the medium (poly)methylmethacrylate (PMMA). Photoluminescence excitation is associated with interband transitions of electrons in the semiconductor structures, absorption of optical radiation energy by defects in the crystal structure, as well as with the transfer of energy to the excited energy levels of Mn2+ ions. Luminescence occurs as a result of recombination processes at the levels of defects in the structure of the surface of particles and 4T1 → 6A1 transitions between the proper energy levels of Mn2+ ions. Based on changes in the photoluminescence spectra and photoluminescence excitation of PMMA/(Zn,Cd,Mn)S compositions, assumptions are made about the structure of particles. It is shown that their photoluminescence is affected by the distribution of Mn2+ ions in the structure of layers and on the surface of particles.

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Tunable narrow emission in ZnS/CdS/ZnS quantum well structures prepared by aqueous route

Cited by 16 publications

References 39 publications

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

Comparison of average crystallite size by X-ray peak broadening and Williamson–Hall and size–strain plots for VO2+ doped ZnS/CdS composite nanopowder

Фотолюминесценция низкоразмерных композитных структур полиметилметакрилат/(Zn,Cd,Mn,Eu)S

Синтез И Фотолюминесценция Наноразмерных Структур На Основе Сульфидов Цинка, Кадмия И Марганца В Полиакрилатной Матрице

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