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In persistent luminescence materials, energy can be stored by controlled traps/defects under brief irradiation, namely few minutes under various wavelengths ranging from X-rays to natural daylight. This energy is then released at room temperature for several hours via light emission once the excitation is stopped. The paper is focused on the analysis of the persistent luminescence properties on single crystals of Ce3+ and Cr3+ co-doped gadolinium-yttrium-aluminum-gallium garnets of general formula Y3-xGdxAl2Ga3O12 (YGAGG), to promote new applications of the persistent materials. Extending the range of excitation by using X-rays excitation is also proposed.
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