Abstract
Photoluminescence (PL) of chromium-doped spinel-type semiconductor α-ZnAl 2S 4 has been studied in the temperature range 2–540 K. The transitions between ground state 4A 2g and 2E g, 2T 1g, 2T 2g, 4T 2g, 4T 1g excited levels of Cr 3+ ions in absorption and emission spectra have been observed. A fit of the measured temperature dependence of the PL decay, using a four-level model, gave the lifetimes of the 2E g, 2T 1g and 4T 2g levels. The energy gaps between 2E g– 2T 1g and 2E g– 4T 2g states have been determined and they are very close to the values obtained from steady-state measurements. A configurational coordinate diagram for Cr 3+ ions in the α-ZnAl 2S 4:Cr spinel host has been constructed.
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