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1
Content available remote

Exciton Electroluminescence of ZnSe/ZnO Structures under Biaxial Stress

100%
Bała W., Firszt F., Łęgowski S., Męczyńska H.
Acta Physica Polonica A
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1992
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vol. 82
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issue 5
896-899
EN
The strained ZnSe/ZnO structures grown on (111) ZnSe crystals by plasma oxidation was investigated by electro- and photoluminescence methods. The lines of heavy and light hole excitons under biaxial compressive stress are measured as a function of the temperature.
2
Content available remote

Electrical and Optical Properties of ZnSe:Mg Crystals

100%
Szatkowski J., Firszt F., Męczyńska H., Łęgowski S.
Acta Physica Polonica A
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1993
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vol. 84
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issue 3
531-534
EN
ZnMgSe mixed crystals were obtained by the high pressure Bridgman method and by thermal diffusion of Mg metal into ZnSe crystals. Measurements of luminescence and transmission spectra show that the band-gap energy of such mixed crystals is larger than that of "pure" ZnSe. ZnMgSe crystals exhibit n-type conductivity and electrical parameters comparable with that of ZnSe. Blue-violet luminescence in the temperature range from 40 K to room temperature was observed. This feature makes this material very promising for future applications in constructing short wavelength electroluminescent devices.
3
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Luminescence Quantum Efficiency of Mn^{2+} States in ZnSe:Mn as Studied by means of Photoacoustic Spectroscopy

76%
Męczyńska H., Łęgowski S., Dąbrowska W., Popielarski M., Ogielski Z., Zakrzewski J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 4
823-825
EN
The photoacoustic spectroscopy with a piezoelectric transducer was employed to determined the quantum efficiency for low Mn concentration in ZnSe monocrystals. The photoacoustic spectra were measured using the continuous wave excitation and nanosecond pulse method.
4
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Composition Dependence of Photoluminescence Spectra in Zn_{1-x}Mg_{x}Se Mixed Crystals

76%
Firszt F., Łęgowski S., Μęczyńska H., Szatkowski J., Paszkowicz W., Spolnik Z. M.
Acta Physica Polonica A
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1995
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vol. 88
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issue 4
711-714
EN
Ζn_{1-x}Mg_{x}Se mixed crystals with x ranging from 0 to 0.56 were obtained by high pressure Bridgman method. It has been found that a phase transition from sphalerite structure to wurtzite one occurs at x = 0.185 ± 0.03. The crystals exhibit blue-violet and yellow-green (depending on x) luminescence in the temperature range from 40 K to room temperature. An attempt has been also made to dope Ζn_{1-x}Μg_{x}Se crystals with Al. The incorporation of Al produces a strong green photoluminescence in the temperature range from 40 K to 300 K but almost completely quenches the near-band-edge emission.
5
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Photoluminescence and Photoacoustic Investigations of Beryllium and Magnesium Containing Wide Gap II-VI Mixed Crystals

76%
Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Zakrzewski J., Paszkowicz W.
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vol. 95
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issue 6
991-996
EN
Zn_{1-x}Be_{x}Se, Cd_{1-x}Mg_{x}Se and Zn_{1-x-y}Be_{x}Mg_{y}Se mixed crystals grown from the melt with different concentrations of Be and Mg have been characterized by photoluminescence and photoacoustic methods. An increase in band gap energy with increasing Be and Mg contents was observed. The photoacoustic spectroscopy was also employed for evaluation of thermal diffusivity of mixed Zn_{1-x}Be_{x}Se crystals with different beryllium contents.
6
Content available remote

Photoacoustic Investigation of Absorption Edge of Cd_{1-x}Mg_{x}Se Mixed Crystals

76%
Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Zakrzewski J., Paszkowicz W.
Acta Physica Polonica A
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1997
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vol. 92
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issue 4
749-752
EN
The Cd_{1-x}Mg_{x}Se crystals were grown by modified Bridgman method for x ranging from 0 to 0.44. The photoacoustic spectroscopy was employed for evaluation of the band gaps of series Cd_{1-x}Mg_{x}Se mixed crystals with different composition. The photoacoustic spectra were measured at 300 K and 90 K using continuous wave excitation in the range from 400 nm to 800 nm. The increase in the band-gap energy with increasing Mg content is observed. The photoacoustic results are compared with photoluminescence and transmission spectra.
7
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Optical and Structural Properties of Zn_{1-x}Be_{x}Se Mixed Crystals

64%
Firszt F., Łęgowski S., Męczyńska H., Szatkowski J., Zakrzewski J., Paszkowicz W., Domagała J., Marczak M.
Acta Physica Polonica A
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1998
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vol. 94
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issue 2
309-312
EN
Optical and structural properties of Zn_{1-x}Be_{x}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).
8
Content available remote

Positron Annihilation Characteristics in Zn_{1-x}Mg_{x}Se Mixed Crystals

64%
Firszt F., Szatkowski J., Męczyńska H., Łęgowski S., Saarinen K., Hautojarvi P., Plazaola A., Reniewicz H., Dobrzyński L., Chabik S.
Acta Physica Polonica A
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1998
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vol. 94
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issue 2
300-304
EN
Positron annihilation characteristics as a function of composition and annealing in zinc vapour were measured and compared with photoluminescence spectra for Zn_{1-x}Mg_{x}Se mixed crystals with 0 ≤ x ≤ 0.6. The positron annihilation data show that there is a substantial number of divacancies present in the system under study. The concentration of such defects is reduced at least by the factor of two upon annealing in zinc vapour.
9
Content available remote

Raman Scattering in Zn_{1-x}Mg_{x}Se Mixed Crystals

64%
Kozielski M., Szybowicz M., Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Paszkowicz W.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1040-1044
EN
This paper presents results of investigations of the Raman scattering of vibrational modes in Zn_{1-x}Mg_{x}Se crystals for the range of composition 0 < x < 0.43. The Raman polarized spectra of Zn_{1-x}Mg_{x}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 isodisplacement model. Results of the Raman measurements in the investigated range of composition confirm the two-mode behaviour of the optical phonons in the mixed Zn_{1-x}Mg_{x} Se crystals.
10
Content available remote

Investigation of Electronic Structure of Zn_{1-x}Mg_{x} Mixed Crystals by Compton Spectroscopy Method

64%
Reniewicz H., Andrejczuk A., Dobrzyński L., Rećko K., Waliszewski J., Żukowski E., Firszt F., Łęgowski S., Meczyńska H., Szatkowski J.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
907-910
EN
The first experimental study of the Compton profiles of Zn_{1-x}Mg_{x}Se for x=0.25, 0.47, 0.56 mixed crystals is presented. The Compton profiles were measured with the use of the ^{241}Am radioactive source with a resolution of 0.57 a.u. The experimentally obtained Compton profiles were compared with the theoretical ones based on the free-atom model. The results are interpreted in terms of outermost electrons of Zn and Mg being promoted to the higher momentum states, and 4p-electrons of Se becoming more delocalised in a solid, being thus promoted to the lower momentum states.
11
Content available remote

A Photoacoustic Study of Zn_{1-x}Mg_{x}Se Mixed Crystals

64%
Męczyńska H., Zakrzewski J., Łęgowski S., Popielarski M., Firszt F., Szatkowski J., Klugiewicz R., Łęgowski K.
Acta Physica Polonica A
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1995
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vol. 87
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issue 2
547-550
EN
The photoacoustic spectroscopy with a piezoelectric transducer was em­ployed to evaluate the band gaps of a series of Zn_{1-x}Mg_{x}Se mixed crystals of different composition. The photoacoustic measurements performed at room temperature yield information about the quality of the samples. The photoa­coustic spectra were measured using the continuous wave and nanosecond pulse excitation.
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