Abstract
Since the crystal-field strength at theCr3 + siteis very close to the excited-state crossover (ESCO), this work investigates the optical properties ofCr3 + -dopedGd3Ga5O12 (GGG) nanoparticles as a function of temperature and pressure in order to establish theeffect of the ESCO on the optical behaviour of nanocrystalline GGG. Luminescence,time-resolved emission and lifetime measurements have been performed onGGG:0.5% Cr3 + nanoparticles in the 25–300 K temperature range, as well as under hydrostatic pressureup to 20 GPa. We show how low temperature and high pressure progressivelytransforms broadband emission into a ruby-like luminescence. This behaviour together with the lifetime dependence on pressure andtemperature are explained on the basis of the spin–orbit interaction between the 4T2 and 2E statesof Cr3 + .
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