21:I[432972,["/_next/static/chunks/bb923814e1f4d2e9.js","/_next/static/chunks/dd3ee9f5b7716ca6.js","/_next/static/chunks/4204a0ae82542ca8.js","/_next/static/chunks/1270dead247da766.js","/_next/static/chunks/6e1aa89a642f40be.js","/_next/static/chunks/2d7aa753e81324a8.js","/_next/static/chunks/8ffd0b71567920d8.js","/_next/static/chunks/67ea6dfd21f16c5f.js","/_next/static/chunks/24eb4379f68013fd.js","/_next/static/chunks/b8cd775ffdf935bd.js","/_next/static/chunks/983103cd9eb7b428.js","/_next/static/chunks/263f2cdcb9aa2341.js","/_next/static/chunks/294b9525248c8e5f.js"],"default"] 22:T44e,Fe³⁺-doped near-infrared (NIR) phosphors have received a lot of interest because they are nontoxic, inexpensive, and ecologically benign. In this work, Fe³⁺-activated Li₂ZnAO₄ (A = Si, Ge) phosphors were synthesized by solid-phase reactions, in which Fe³⁺ entered the Zn²⁺ tetrahedral site. When excited by 300 nm UV light, broad NIR emission bands at 750 nm (Li₂ZnSiO₄: Fe³⁺) and 777 nm (Li₂ZnGeO₄: Fe³⁺) were observed, with internal quantum efficiencies (IQE) of 62.70% (Li₂ZnSiO₄: Fe³⁺) and 30.57% (Li₂ZnGeO₄: Fe³⁺). The thermal stability was increased from 35.43 to 49.79% at 373 K via cationic regulation. The combination of activation energy, electron-phonon coupling, and Debye temperature explained the improved thermal stability of Li₂ZnGeO₄: Fe³⁺ phosphor. Besides, the as-synthesized phosphor demonstrated sensitive and selective Cu²⁺ ion detection.23:T430,Abstract With the development of science and technology, the measurement of temperature is receiving more and more attention. However, ratiometric fluorescent thermometers based on thermally coupled energy levels remain challenging because of their low relative sensitivity ( S r ). In this work, chromium activated zirconium‐halide perovskite Cs 2 ZrCl 6 microcrystals are successfully synthesized via a simple co‐precipitation method at room temperature. Interestingly, the host Cs 2 ZrCl 6 exhibits reverse thermal quenching due to its thermal‐activated delayed fluorescence (TADF) behavior, while the Cr 3+ dopant shows normal thermal quenching. Leveraging the difference in their temperature‐dependent luminescent properties, a ratiometric fluorescent thermometer is ingeniously developed, whose S r reaches a maximum of 4.23% K −1 . Besides, the as‐synthesized thermometer is demonstrated for mobile phone remote temperature measurement. This finding offers a new approach for the design of high‐sensitivity ratiometric fluorescent temperature sensors.

#	Concept	H-Index	Publications	Citations
1	Engineering	2	2	30
2	Chemistry	2	2	30
3	Materials Science	2	2	30
4	Optical Sensors	1	1	15
5	Energy Storage	1	1	15

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