Abstract Recent work on Al 2 O 3 :Cr 3+ introduces a compelling mechanoluminescence platform based on a simple oxide, highlighting dopant-localized emission driven by stress-induced carrier dynamics at Cr centers. This advances a shift from bulk-mediated processes to dopant-centered carrier dynamics, enabling more rational and precise materials design. However, the origin of carrier separation required for dopant ionization remains to be clarified, particularly regarding the role of interfacial and heterojunction-induced fields; addressing these aspects may rapidly establish a more comprehensive understanding of the coupled mechanisms involving localized excitation and field-assisted carrier modulation.
Parvathala et al. (Fri,) studied this question.