Once upon a time it was a surrogate for diamond. Now old SrTiO3 shines with its own (blue) light, as a radiative process from oxygen vacancies is discovered.
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Hwang, H. Oxygen vacancies shine blue. Nature Mater 4, 803–804 (2005). https://doi.org/10.1038/nmat1515
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DOI: https://doi.org/10.1038/nmat1515
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