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Metastable states form by charge (electron and hole) capture in defects in asolid. They play an important role in dosimetry, information storage, and manymedical and industrial applications of photonics. Despite many decades ofresearch, the exact mechanisms resulting in luminescence signals such asoptically/thermally stimulated luminescence (OSL or TL) or long persistentluminescence through charge transfer across the metastable states remain poorlyunderstood. Our lack of understanding owes to the fact that such luminescencesignals arise from a convolution of several steps such as charge (de)trapping,transport and recombination, which are not possible to track individually. Herewe present a novel coupled RPL(radio-photoluminescence)/OSL system based on anelectron trap in a ubiquitous, natural, geophotonic mineral called feldspar(aluminosilicate). RPL/OSL allows understanding the dynamics of the trappedelectrons and trapped holes individually. We elucidate for the first time trapdistribution, thermal eviction, and radiation-induced growth of trappedelectron and holes. The new methods and insights provided here are crucial fornext generation model-based applications of luminescence dating in Earth andenvironmental sciences, e.g. thermochronometry and photochronometry.

A novel coupled RPL/OSL system to understand the dynamics of the metastable states