Investigation of photoluminescence of -doped double perovskites with the formula (A=Sr, Ba) revealed that the electric dipole transition is present when is doped at the noncentrosymmetric Sr site vis-a-vis substitution at the centrosymmetric Ca site. Strong CT band absorption was observed in both series of compounds in the near ultraviolet region. Commission Internationale de I'Eclairage chromaticity coordinates indicate that -doped compounds are potential orange-red emitting phosphors, whose emission intensity is 1.5 times that of commercial phosphor for white LEDs based on NUV GaN based LEDs.
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Sivakumar et al. (2006) studied this question.
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