2026-10-09T15:11:42Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34009122 2026-09-28T05:36:04Z category_37 portal_316 item_type_3 month_year_09_2026

Supplementary file 1_Seamless triple-mode luminescence thermometry in Lu3(Al4Ga1)O12:Pr: high sensitivity from 11 to 700 K.docx Justyna Zeler (9204949) Joanna Trojan-Piegza (25119738) Eugeniusz Zych (17632888) Organic Chemistry LuAGG:Pr luminescence thermometry multimodal thermometry Pr3+ spectroscopy wide range luminescence thermometry <p>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.</p> 2026-09-28T05:36:04Z Dataset Dataset 10.3389/fchem.2026.1924671.s001 https://figshare.com/articles/dataset/Supplementary_file_1_Seamless_triple-mode_luminescence_thermometry_in_Lu3_Al4Ga1_O12_Pr_high_sensitivity_from_11_to_700_K_docx/34009122 CC BY 4.0