Authors
Justyna Zeler, Joanna Trojan-Piegza, Eugeniusz Zych
Published in
Frontiers in chemistry. Volume 14. Pages 1924671. Epub Sep 28, 2026.
Abstract
This study reports on the high-performance luminescence thermometry of a Lu3(Al4Ga1)O12:Pr (LuAGG:Pr) phosphor, demonstrating a remarkable operational range spanning from deep-cryogenic to high-temperature regimes (11-700 K). Its relative thermal sensitivity, S r, remains between 0.7% and 6.5% K-1, exceeding 1% K-1 over the vast majority of this interval. To overcome the sensitivity bottlenecks inherent to single-parameter thermometers, we propose a multi-mode thermometric strategy that leverages three distinct physical mechanisms. At cryogenic temperatures (11-120 K), the population redistribution among the Stark levels of the 1D2 state yields a maximum S r of 6.5% K-1. In the intermediate range (120-320 K), sensing is governed by the Boltzmann-coupled 3P1 and 3P0 states, yielding a maximum S r of 5.5% K-1 when using the two-level emission ratio. Crucially, we demonstrate that the integration of the intensity ratio between the interconfigurational 5d→4f and 1D2→3H4 emissions - primarily driven by multiphonon relaxation - significantly enhances performance at elevated temperatures. While Boltzmann-type distributions show declining sensitivity above room temperature, this multiphonon-driven 5d/4f ratio revitalizes the sensor, maintaining S r > 1% K-1 up to 700 K, with S r peak of 2.2% K-1 at 465 K. By strategically combining these three parameters, we achieve a continuous, high-sensitivity profile across the entire 11-700 K window, establishing LuAGG:Pr as one of the most versatile Pr3+ singly activated materials for advanced thermal sensing reported to date.
PMID:
42865486
Bibliographic data and abstract were imported from PubMed on 13 Oct 2026.
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