Luminescence of Zn1 − Mg Se, Zn1 − Mg Se:Al and Zn1 − Mg Se:I mixed crystals grown by Bridgman method

Firszt, F.; Łęgowski, S.; Μęczyńska, H.; Oczkowski, H. L.; Osińska, W.; Szatkowski, J.; Paszkowicz, W.; Spolnik, Zoya

doi:10.1016/0022-0248(95)00785-7

Cited by 29 publications

(16 citation statements)

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“…With increasing Be content, the microscopic fluctuations of composition cause smearing of the band edges resulting in an observed broadening of exciton lines. This broadenmg, however, is lower than the analogous broadening of exciton luminescence lines in Ζn1-x Μgx Se solid solutions [5]. Annealing the as-grown samples with Be concentration x < 0.3 causes an increase in the intensity ratio of edge emission to deep levels one.…”

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Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

et al. 1998

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Optical and structural properties of Ζn 1 -x Bex Se bulk crystals in the range of composition 0 _ < x < 0.41 have been studied. These crystals were grown by Bridgman method under an argon overpressure. Transmission, absorption, photoluminescence and photoacoustic spectra as a function of composition were investigated. It has been found that the crystal structure is of sphalerite type. The crystal quality increases when the crystallization process of the same boule is performed more than once. In the investigated composition range the lattice constant decreases and the energy gap increases with increasing beryllium content. From photoluminescence measurements the excitonic energy gap about 3.64 eV at 40 K was estimated for the highest obtained Be concentration (x = 0.41).PACS numbers: 78.55. Et, 62.65.+k Mixed crystals of wide gap Il-VI compounds with Be chalcogenides are of particular interest because of their potential applications in constructing visible and UV lasers. The Zn1-xBexSe has a much higher degree of covalent bonding as compared to other (more ionic) wide gap II-VI compounds which modifies its mechanical properties [1]. This is expected to result in considerable lattice rigidity, a very important factor for reducing defects migration and multiplication. Until now, the published papers were concerned in thin films [2] but the fundamental properties of mixed Ζn 1 -x BeSe bulk crystals remain unknown for the wide range of composition. Some preliminary results for 0 < x < 0.17 have been recently published in Ref. [3].Zn 1 -x Bex Se crystals were grown by Bridgman method under an argon overpressure in the range of composition 0 < x < 0.41 using a powder mixture of (309)

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confidence: 76%

Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

et al. 1998

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“…It has been also observed in Zn1-x Mg x Τe [8,9], Cd1-x MgxΤe [10] and Zn1-x Mgx Se [11,12]. Some preliminary results on photoluminescence and electrical properties of Ζn1-x Mgx Se bulk crystals have been already published [5,6].…”

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confidence: 90%

“…This lighter component exhibits a vibrational mode (local mode) with a frequency higher than that of the perfect crystal. Such behaviour can be expected for Zn1-x Mg x Se mixed crystal which is lately extensively studied because of potential application in constructing blue and UV light sources [3][4][5][6]. However, no experimental data for Ζn1-x Mgx Se bulk crystals are available until now.…”

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“…The following data were taken for calculations: TO (ZnSe) = 205 cm -1 , LO (ZnSe) = 251 cm -1 , ε∞ (ZnSe) = 9.2. The following linear dependence of cubic lattice constant on Mg content x were used: α(x) = 5.67 + 0.22x Α [5,6]. In the applied MREI model we estimated all parameters of pure MgSe to fit the computed values to experimental data, since these data for MgSe are not known.…”

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Raman Scattering in Zn_1-xMg_xSe Mixed Crystals

et al. 1996

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This paper presents results of investigations of the Raman scattering of vibrational modes in Ζn1-xMgxSe crystals for the range of composition 0 < x < 0.43. The Raman polarized spectra of Zn1-x Mgx Se were measured at room temperature. The typical Raman spectrum shows four peaks which can be interpreted as longitudinal and transverse optical ZnSe-like and MgSe-like phonons. The ZnSe-like and MgSe-like vibrations can be described by the modified random element isodisylacement model. Results of the Raman measurements in the investigated range of composition confirm the two-mode behaviour of the optical phonons in the mixed Zn1-x MgxSe crystals.PACS numbers: 78.30. Fs, 78.55.Et, The physical properties of wide gap II-VI ternary and quaternary mixed crystals have been recently extensively studied. The current interest in these materials arises from scientiflc and application points of view. As far as an application is concerned, ternary and quateuary II-VI alloys are especially interesting in the context of possibility of an additional control of band gap energies, lattice constants as well as conduction and valence bands offsets in heterostructures. These parameters are very important for effective carriers injection and radiative recombination processes in electroluminescent devices based on multilayer heterostructures.For the study of vibrational properties of mixed crystals the Raman scattering is widely used as the experimental method. The vibrational spectra of tetrahedrally coordinated semiconduction where a fraction of cations is replaced by an

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“…The Zn1_xMgxSe solid solution is particularly interesting since it is *The results of this paper were initially presented at The Jabłoński Centennial Conference on Luminescence and Photophysics, July 23-27, 1998, Torun, Poland. a component of ZnMgSSe, the system used as a cladding layer in construction ZnSe based diodes. It enables tuning of band energies and lattice constants by adjusting the Mg content [5][6][7] as well as it can be matched to some III-V alloys [8]. Thus, determination of the basic properties of Znl_ x Mgx Se and particularly the understanding of the nature of defects created in such crystals is of high interest.…”

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Cathodoluminescence Studies of Polytype Structure in Zn_1-xMg_xSe

et al. 1999

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Zni_xMgx Se crystals grown by Bridgman method show spatial transition from sphalerite (3C) to wurzite structure (2H) with increasing Mg content (x). Within the transition range, near x = 0.19, coexistence of hexagonal and cubic structure results in the formation of polytype sequences of 3C-8H-4H-2H. We have investigated the spatial distribution of the polytypes in Zn1_ Mg x Se mixed crystals with a value of x close to that of the phase transition using spectrally as well as spatially resolved cathodoluminescence. Three emission bands in the cathodoluminescence spectrum have been observed, two strong lines at 2.99 eV and 2.965 eV, and a weak shoulder at 2.95 eV. The lines at 2.965 and 2.99 eV are known in the literature as an exciton recombination in the 8H and 4H polytype structure. We have found the third one at 2.95 eV to be due to luminescence in the 3C structure. These results demonstrate the usefulness of cathodoluminescence measurements for investigations of spatial distribution of inhomogeneities of mixed semiconductors.

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Luminescence of Zn1 − Mg Se, Zn1 − Mg Se:Al and Zn1 − Mg Se:I mixed crystals grown by Bridgman method

Cited by 29 publications

References 10 publications

Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

Raman Scattering in Zn_1-xMg_xSe Mixed Crystals

Cathodoluminescence Studies of Polytype Structure in Zn_1-xMg_xSe

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Luminescence of Zn1 − Mg Se, Zn1 − Mg Se:Al and Zn1 − Mg Se:I mixed crystals grown by Bridgman method

Cited by 29 publications

References 10 publications

Optical and Structural Properties of Zn1-xBexSe Mixed Crystals

Optical and Structural Properties of Zn1-xBexSe Mixed Crystals

Raman Scattering in Zn1-xMgxSe Mixed Crystals

Cathodoluminescence Studies of Polytype Structure in Zn1-xMgxSe

Contact Info

Product

Resources

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Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

Optical and Structural Properties of Zn_1-xBe_xSe Mixed Crystals

Raman Scattering in Zn_1-xMg_xSe Mixed Crystals

Cathodoluminescence Studies of Polytype Structure in Zn_1-xMg_xSe