The influence of variations in composition ( x = MgO/Al 2 O 3 = 0.3–1.0), Fe 2 O 3 concentrations (0.05 mol%–2.0 mol%), and O 2 concentrations (100 vol% and 0 vol%) in the atmosphere on the PL characteristics of Fe-doped MgAl 2 O 4 crystals were investigated using single phase spinel crystals grown by FZ technique. The peak wavelength shift of photoluminescence at around 730 nm are observed depending on the Fe 2 O 3 concentration and composition. Concentration quenching of red PL occurred at Fe 2 O 3 concentration above 0.1 mol%. PL intensity was higher in samples grown in 100 vol% O 2 compared to those grown in 100 vol% Ar. PL intensity from Fe-doped MgAl 2 O 4 increased with increasing compositions x from 0.3 to 1.0. MgAl 2 O 4 doped with 0.1 mol% Fe 2 O 3 , and a stoichiometric composition ( x = 1.0) grown in 100 vol% O 2 , demonstrated strong red PL with ultraviolet-C (UVC) lights excitation.
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Hitomi et al. (2024) studied this question.
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