Answers are grounded in this paper and cite their sources.
The red luminescence of bismuth-doped alkaline-earth-metal sulfates is ascribed to the presence of divalent bismuth The optical transitions are due to transitions within the 6p shell.
No takes yet. Share an insight, caveat, or question.
Hamstra et al. (1994) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: