Growth and characterization of MgxCd1 − xSe single crystals

Shin, Dongho; Kim, Chang‐Dae; Jang, Hyang-Hee; Choe, Sung-Hyu; Kim, Duck-Tae; Yoon, Chang-Sun; Kim, Wha‐Tek

doi:10.1016/s0022-0248(97)00122-x

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Bulk Cd 1-x Mg x Te monoliths have also been prepared by zone melting in a vertical three-heat-zone tubular furnace [12] and, in the case of Mg x Cd 1-x Se, bulk single crystals were grown in quartz tubes by chemical transport reaction technique by time-varying temperature profile [13]. In spite of the potential advantages, to our knowledge there is no report of Cd 1-x Mg x Te alloys in the context of colloidal quantum dots [14].…”

Section: Introductionmentioning

confidence: 99%

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

et al. 2017

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This work describes the synthesis of a glutathione-capped Cd 1-x Mg x Te semiconductor nanocrystal alloy in aqueous solution. The effects of reaction time and Cd:Mg molar proportion on the spectroscopic and electrochemical properties were optimized. The Cd 1-x Mg x Te material was found to emit in the visible range (blueishgreen to dark pink), with the band gap energy depending both on the Mg:Cd ratio and of the nanocrystal size. The insitu growth of the nanocrystal alloy on both graphene oxide and reduced graphene oxide leads to partial quenching of the photoluminescence of Cd 1-x Mg x Te but improves the electrochemical response of the nanocrystals. Carbon paste electrodes (CPE) were modified with the graphene-based materials containing semiconductor nanocrystals, and it is shown that such a modified CPE can be applied to the determination of the local anesthetic lidocaine and the anaphylactic drug epinephrine via differential pulse voltammetry. Each analyte can be determined both individually and in the presence of constant concentrations of the other, best at typical oxidation potentials of 0.25 V and 1.0 V (vs. Ag/ AgCl), respectively. In the best cases, the detection limits are 92 nM for lidocaine and 0.95 μM for epinephrine.

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Section: Introductionmentioning

confidence: 99%

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

et al. 2017

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“…In the previous works [9,10], we reported some results of optical absorption and photoluminescence for the Mg x Cd 1−x Se single crystals prepared by the iodine transport technique. In this study, we report on the dependence on composition and temperature of the band gap and the lattice constants for the Mg x Cd 1−x Se system in the composition range of 0.00 ≤ x ≤ 0.46 and in the temperature range of 11 to 290 K.…”

mentioning

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“…2 Experimental Mixed single crystals of Mg x Cd 1−x Se were grown in the region of 0.00 ≤ x ≤ 0.46 by the modified chemical transport reaction method by using iodine as a transporting agent, which is described in detail in our previous paper [9]. The final temperature gradient was held at 900…”

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Composition and temperature dependence of band gap and lattice constants of Mg _x Cd _{1–
x} Se single crystals

Kim

Park

Jeong

et al. 2006

Phys. Status Solidi (c)

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The composition and temperature dependence of the band gap and the lattice constants of the MgxCd1−xSe crystals was investigated in the composition range of 0.00 ≤ x ≤ 0.46 and in the temperature range of 11 to 290 K. The lattice constants showed a composition dependence decreasing linearly with increasing composition x, and also showed a temperature dependence that the relative variation of the lattice constants with temperature is somewhat different from each other for all the crystals. The temperature dependent behavior of the lattice constants was also observed with an inverse trend in the temperature dependence of the band gaps. The temperature dependence of the band gaps was well fitted by the empirical Varshni equation for all the investigated compositions. The composition dependence of the band gaps was represented by the linear relationship of Eg(x) = 1.742 + 1.813 x for 290 K and Eg(x) = 1.828 + 1.871 x for 11 K.

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Optical absorption spectra of substitutional Co ²⁺ ions in Mg _x Cd _{1–
x} Se alloys

Jin

Kim

Jang

et al. 2006

Phys. Status Solidi (c)

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Optical absorption spectra of substitutional Co 2+ ions in Mg x Cd 1−x Se alloys were investigated in the composition region of 0.0 ≤ x ≤ 0.4 and in the wavelength region of 300 to 2500 nm at 4.8 K and 290 K. We observed several absorption bands in the wavelength regions corresponding to the 4 A2( 4 F) → 4 T1( 4 P) transition and the 4 A2( 4 F) → 4 T1( 4 F) transition of Co 2+ at a tetrahedral T d point symmetry point in the host crystals, as well as unknown absorption bands. The several absorption bands were analyzed in the framework of the crystal-field theory along with the second-order spin-orbit coupling. The unknown absorption bands were assigned as due to phonon-assisted absorption bands. We also investigated the variations of the crystal-field parameter Dq and the Racah parameter B with composition x in the Mg xCd1−xSe system. The results showed that the crystal-field parameter (Dq) increases, on the other hand, the Racah parameter (B) decreases with increasing composition x, which may be connected with an increase in the covalency of the metal-ligand bond with increasing composition x in the Mg xCd1−xSe system. 1 Introduction Mg x Cd 1−x Se, one of the Mg-based II-VI semiconductors, has been expected as a useful alloy system for optoelectronic device applications in the range of the whole visible spectrum between the band gap energy 1.7 eV of CdSe and 3.6 eV of MgSe [1,2]. The alloy system has the possibility for the tuning of band gap and lattice constants by varying the Mg concentration so that they can easily be matched with III-V alloy substrates for device applications. In recent investigations of optoelectronic materials, 3d transition metal impurities have aroused a great deal of interest. The transition metal impurities have been known to introduce deep levels in band gaps of semiconductors. These levels not only control number, type and mobility of conducting carriers, but also act as activators or killers in luminescent materials. However, there has been no exact understanding of the optical properties of the transition metal impurities in Mg x Cd 1−x Se alloy system. Also, the Mg x Cd 1−x Se system of the A x B 1−x C ternary type is suitable to obtain further information on the optical transitions due to the transition metal centers in optoelectronic materials, because it gives a great deal of variations in the degree of the crystal-field between a transition metal atom and its ligands with composition x.In this paper, we report the results of the optical absorption spectra of substitutional Co 2+ ions in Mg x Cd 1−x Se alloys, and their fine structures were analyzed in the framework of the crystal-field theory.

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Growth and characterization of MgxCd1 − xSe single crystals

Cited by 7 publications

References 17 publications

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

Composition and temperature dependence of band gap and lattice constants of Mg _x Cd _{1–
x} Se single crystals

Optical absorption spectra of substitutional Co ²⁺ ions in Mg _x Cd _{1–
x} Se alloys

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Growth and characterization of MgxCd1 − xSe single crystals

Cited by 7 publications

References 17 publications

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

Cd1-xMgxTe semiconductor nanocrystal alloys: Synthesis, preparation of nanocomposites with graphene-based materials, and electrochemical detection of lidocaine and epinephrine

Composition and temperature dependence of band gap and lattice constants of Mg x Cd 1– x Se single crystals

Optical absorption spectra of substitutional Co 2+ ions in Mg x Cd 1– x Se alloys

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Composition and temperature dependence of band gap and lattice constants of Mg _x Cd _{1–
x} Se single crystals

Optical absorption spectra of substitutional Co ²⁺ ions in Mg _x Cd _{1–
x} Se alloys