Structural, optical and magnetic properties of Cu doped CdSe powders prepared by solid state reaction method

Sivasankar, J.; Mallikarjana, P.; Begam, M. Rigana; Rao, N. Madhusudhana; Kaleemulla, S.; Subrahmanyam, J. V.

doi:10.1007/s10854-015-4025-9

Cited by 16 publications

(11 citation statements)

References 28 publications

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“…Historical reports on DMS reveal that the II-VI host semiconductor materials when doped with transition magnetic element had greater solubility limit [18]. The ternary DMS based on II-VI semiconductor compounds such as CdTe, CdSe, CdS, ZnS, ZnSe as host materials have been widely studied [19][20][21][22][23][24][25]. Among the binary semiconductors, ZnSe is an important II-VI group semiconductor material, stated to be chemically more stable and technologically better than other semiconductor materials.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Ferromagnetism in Cr Doped ZnSe Powders Prepared by Solid State Reaction

Mallikarjana¹,

Sivasankar²,

Begam³

et al. 2016

J. Nano- Electron. Phys.

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Zn1-xCrxSe (x  0.00, 0.05, & 0.10) powders were prepared by solid state reaction method. The influence of chromium (Cr) doping into ZnSe on structural, optical and magnetic properties Zn1-xCrxSe powder samples was studied and reported. All the Zn1-xCrxSe powder samples were identified in zinc blende crystal structure. The lattice constant of Zn1-xCrxSe samples decreased with increase in Cr concentration. Diffuse reflectance measurements confirmed an increase in the band gap with increase of Cr concentration. The Zn1-xCrxSe samples exhibited clear hysteresis loop with enhanced room temperature ferromagnetism.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Ferromagnetism in Cr Doped ZnSe Powders Prepared by Solid State Reaction

Mallikarjana¹,

Sivasankar²,

Begam³

et al. 2016

J. Nano- Electron. Phys.

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“…Therefore, unlike previous literature reports, where the Zn i (shallow) and In Zn levels act as donor defect levels and Cu ions which substitute the Zn ions and stay above the valence band in CNCs and act as an acceptor level cannot explain our emission mechanism [ 26 ]. In the case of binary Cu-doped CdSe CNCs [ 42 ] and ternary Zn x Cd 1 − x S [ 18 ], the shift of conduction band edge is shown to tune the Cu-related emission. Furthermore, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties

et al. 2018

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Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum. The quantum yield (QY) of these synthesized Cd-free CNCs increases from 6.0 to 65.0% after coating with a ZnS shell. The CNCs possessing emission from a mixed contribution of deep trap and dopant states to only dominant dopant-related Stokes-shifted emission are realized by a careful control of stoichiometric ratio of different reactant precursors during synthesis. The origin of this shift in emission was understood by using steady state and time-resolved fluorescence (TRF) spectroscopy studies. As a proof-of-concept demonstration, these blue excitable Cu-doped ZnInS/ZnS CNCs have been integrated with commercial blue LEDs to generate white-light emission (WLE). The suitable combination of these highly efficient doped CNCs results led to a Commission Internationale de l’Enclairage (CIE) color coordinates of (0.33, 0.31) at a color coordinate temperature (CCT) of 3694 K, with a luminous efficacy of optical radiation (LER) of 170 lm/Wopt and a color rendering index (CRI) of 88.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2599-x) contains supplementary material, which is available to authorized users.

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“…Since the addition of Co content in the Zn 1-x Co x O film at the expense of Zn leads to a decrease in grain size and an increase in lattice defects. The hexagonal wurtzite crystal is characterized by two lattice parameters a and c, and the crystal plane is given by [20,21]…”

Section: X-ray Diffraction and Morphological Analysismentioning

confidence: 99%

“…However, the type of substrate and growth conditions strongly affects the spectrum, so data analysis is usually not that easy. Therefore, extracting the refractive index n and the extinction coefficient k is very important to understand the optical properties of the studied film [20].…”

Section: Theoretical Background Of Kramers-kronig (K-k) Relationsmentioning

confidence: 99%

Investigation of the opto-magnetic properties of Co doped ZnO nanoparticles and thin films for spintronics

Ibrahim¹,

Mahmoud²,

Galal³

et al. 2021

JOR

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Zn1-xCoxO (0≤x≤0.10) nanocrystalline compounds with different compositions were prepared by ball milling, and thin films of these compounds were prepared by electron evaporation method. XRD patterns are used to study the structural properties of these films. All films showed a hexagonal wurtzite structure. Using XRD patterns, calculate crystallite. The optical constants n and k of the Zn1-xCoxO nanocrystalline film are calculated in the range of 300-2500 nm based on K-K method. As Co is more doped, the refractive index also shows an increase. According to the Tauc relationship, the optical energy gap of the Zn1-xCoxO film is calculated, which proves to be a direct transition.

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Structural, optical and magnetic properties of Cu doped CdSe powders prepared by solid state reaction method

Cited by 16 publications

References 28 publications

Room Temperature Ferromagnetism in Cr Doped ZnSe Powders Prepared by Solid State Reaction

Room Temperature Ferromagnetism in Cr Doped ZnSe Powders Prepared by Solid State Reaction

Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties

Investigation of the opto-magnetic properties of Co doped ZnO nanoparticles and thin films for spintronics

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