Abstract
A selective substitution of Mn2+ centers for different cations has been attempted in CuAlS2 powder samples. From the theoretical curve fittings of the extended X-ray absorption fine structure oscillations, it has been confirmed that most Mn is incorporated as divalent into one site of Cu or Al, as intended. The Mn2+ centers substituted for Cu show an orange photoluminescence with a peak wavelength of 600 nm. This orange emission has a single exponential decay curve with a decay constant of 1.0 ms. By contrast, the Mn2+ centers substituted for Al show a red emission peaking at 640 nm and have a nonexponential decay curve with a decay constant of 100 µs. This fast emission is thought to be due to the intrinsic luminescence of the 3d5–3d5 transition in Mn2+ centers occupying the Al site. The currently obtained external quantum efficiency is about 40% under 360 nm excitation at room temperature.
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