Temperature dependence of the Cr3+-DOPED Mg2TiO4 near-infrared emission

This paper presents the Cr3+-activated Mg2TiO4 phosphor temperature dependance of its near infrared luminescence and its potential in the optical thermometry applications. In this respect, temperature dependences of three emission features were tested over the broad temperature range (10-500 K): (i) the luminescence intensity ratio (LIR) between emissions from T-4(2) -> (4)A(2) and E-2 -> (4)A(2) transitions, (ii) the emission lifetime, and (iii) the shift of the E-2 -> (4)A(2) emission band. We observed that LIR follows the Boltzmann equation for T > 300 K with the maximal value of relative sensitivity of 1.73 %K-1. The lifetime value of the E-2 -> (4)A(2) transition strongly decreases with temperature with a maximal relative sensitivity of about 0.75 %K-1 at around 430K. Finally, the shift of the emission band is about 65 cm(-1) over the complete temperature range.

Automated summary

This paper investigates the temperature dependence of near infrared luminescence of Cr3+-activated Mg2TiO4 phosphor and its potential applications in optical thermometry. It explores the temperature dependences of three emission features and finds that the luminescence intensity ratio, emission lifetime, and emission band shift all exhibit sensitivity to temperature changes.