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Photoluminescence Spectra of Zn1-xCdxAl2Se4 Single Crystals

Published online by Cambridge University Press:  31 January 2011

Seung-Cheol Hyun
Affiliation:
Department of Physics, Mokpo National University, Mokpo 534–729, Korea
Chang-Dae Kim
Affiliation:
Department of Physics, Mokpo National University, Mokpo 534–729, Korea
Tae-Young Park
Affiliation:
Department of Physics, Wonkwang University, Iri 570–749, Korea
Hyung-Gon Kim
Affiliation:
Department of Electrical Engineering, Chosun University Technical Junior College, Kwangju 501–759, Korea
Moon-Seog Jin
Affiliation:
Department of Physics, Dongshin University, Naju 520–714, Korea
Choong-Il Lee
Affiliation:
Department of Physics, Suncheon National University, Suncheon 540–742, Korea
Jae-Mo Goh
Affiliation:
Department of Physics, Chonnam National University, Kwangju 500–757, Korea
Wha-Tek Kim
Affiliation:
Department of Physics, Chonnam National University, Kwangju 500–757, Korea
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Abstract

We investigated the photoluminescence spectra as well as the crystal structure and optical energy gaps of the Zn1-xCdxAl2Se4 single crystals grown by the chemical transport reaction method. It was shown from the analysis of the observed x-ray diffraction patterns that these crystals have a defect chalcopyrite structure for a whole composition. The lattice constant a increases from 5.5561 A for x = 0.0 (ZnAl2Se4) to 5.6361 A for x = 1.0 (CdAl2Se4) with increasing x, whereas the lattice constant c decreases from 10.8890 A for x = 0.0 to 10.7194 A for x = 1.0. The optical energy gaps at 13 K were found to range from 3.082 eV (x = 1.0) to 3.525 eV (x = 0.0). The temperature dependence of the optical energy gaps was well fitted with the Varshni equation. We observed two emission bands consisting of a strong blue emission band and a weak broad emission band due to donor–acceptor pair recombination in the Zn1-xCdxAl2Se4 for 0.0 ⩽ x ⩽ 1.0. These emission bands showed a red shift with increasing x. The energy band scheme for the radiative mechanism of the Zn1-xCdxAl2Se4 was proposed on the basis of the photoluminescence thermal quenching analysis along with the measurements of photo-induced current transient spectroscopy. The proposed energy band model permits us to assign the observed emission bands.

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Copyright
Copyright © Materials Research Society 2000

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References

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