Abstract
Detailed investigations of the photoluminescence properties ofMn4+ (3d3) ionsin YAlO3 have been performed in the temperature range 10–600 K. The luminescence ofMn4+ ions due to the transition consists of two zero-phonon lines(R lines) at 691.3 and 692.7 nm, which became visible only at low temperature, and their vibronicsidebands that cover the range of 660–740 nm. The thermal quenching of the luminescenceintensity due to the non-radiative decay occurs at temperatures above 420 K. Thetemperature dependence of the luminescence decay time shows a quasi-linear decrease fromτ = 4.9 to 1.6 ms in the temperature range from 90 to 420 K (with a temperature coefficient−0.01 ms K−1) thatmakes YAlO3:Mn a potentially good phosphor for a fibre optic fluorescence thermometer inthis temperature range. The high-pressure low-temperature luminescencemeasurements in a diamond-anvil cell reveal similar pressure coefficients forMn4+ andCr3+ dopantions in YAlO3,equal to 1.16 cm−1 kbar−1 and 1.08 cm−1 kbar−1, respectively.
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