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Unraveling the Lattice Dynamics and Inherent Emission of NaGdMgTeO6 Double Perovskite Phosphor
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DOI：10.1002/asia.70762.png)
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Abstract
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Inherently emitting phosphors are gaining significant attention due to their minimal reabsorption, broad emission profiles, high efficiency, and low cost. In the present work, the inherent emission of the double perovskite tellurate NaGdMgTeO6 is studied for the first time, and the underlying mechanism has been explored in detail. Under 334 nm excitation, the phosphor exhibits an unusual broad NIR emission spanning from 800 to 1200 nm, with a maximum at 948 nm. XPS analysis confirms the presence of Te4+ ions in the host, owing to the incomplete oxidation to Te6+, as well as the formation of oxygen vacancies. Upon annealing the phosphor under O2 atmosphere, a reduction in the content of Te4+ and oxygen vacancies has been observed, which results in a decrease in the overall emission intensity. Temperature-dependent emission spectra reveal that the phosphor exhibits better thermal stability at low temperatures, but undergoes rapid thermal quenching at high temperatures, with an activation energy of 0.16 eV, obtained from the Arrhenius plot. Temperature-dependent Raman analysis indicates a decrease in the phonon lifetime from 49 ps (303 K) to 37 ps (773 K), resulting in an increase in the number of phonon decay channels, contributing to observed thermal quenching.
Keywords:
double perovskites
inherent emission
NIR emission
temperature-dependent Raman spectra
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