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Photoluminescence spectra of Zn1−xCdxAl2Se4-4xS4x single crystals

Published online by Cambridge University Press:  31 January 2011

Sung-Hyu Choe
Affiliation:
Department of Physics, Chosun University, Kwangju 501–579, Republic of Korea
Chang-Sun Yoon
Affiliation:
Department of Physics, Kunsan National University, Kunsan 573–800, Republic of Korea
Moon-Seog Jin
Affiliation:
Department of Physics, Dongshin University, Naju 520–714, Republic of Korea
Seung-Cheol Hyun
Affiliation:
Department of Physics, Mokpo National University, Mokpo 534–729, Republic of Korea
Chang Dae Kim
Affiliation:
Department of Physics, Mokpo National University, Mokpo 534–729, Republic of Korea
Choong-Il Lee
Affiliation:
Department of Physics, Suncheon National University, Suncheon 540–742, Republic of Korea
Jae-Mo Goh
Affiliation:
Department of Physics, Chonnam National University, and Kwangju Branch, Korea Basic Science Institute, Kwangju 500–757, Republic of Korea
Seok-Kyun Oh
Affiliation:
Department of Physics, Chonnam National University, and Kwangju Branch, Korea Basic Science Institute, Kwangju 500–757, Republic of Korea
Ho-Jun Song
Affiliation:
Department of Physics, Chonnam National University, and Kwangju Branch, Korea Basic Science Institute, Kwangju 500–757, Republic of Korea
Wha-Tek Kim
Affiliation:
Department of Physics, Chonnam National University, and Kwangju Branch, Korea Basic Science Institute, Kwangju 500–757, Republic of Korea
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Abstract

We investigated the photoluminescence as well as the crystal structure and optical energy gaps of the Zn1-xCdxAl2Se4-4xS4x solid solution system based on the Al-related compounds of ZnAl2Se4, ZnAl2S4, CdAl2Se4, and CdAl2S4. The single crystals of the system with 0.0 ≤ x ≤ 1.0 were grown by the chemical transport reaction technique. The Zn1-xCdxAl2Se4-4xS4x crystallizes in a defect chalcopyrite structure for a whole composition and has an optical energy gap ranging from 3.525 to 3.577 eV at 13 K. The photoluminescence spectra at 13 K showed a strong emission band in the blue spectral region and a weak broad emission band in the visible region due to donor–acceptor pair recombination. The composition and temperature dependence of these bands were examined in the investigated regions. The simple energy band scheme for the radiative mechanisms of the Zn1-xCdxAl2Se4-4xS4x is proposed on the basis of our experimental results along with photo-induced current transient spectroscopy measurements.

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Copyright
Copyright © Materials Research Society 2000

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