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Currently available temperature measurements or imaging at nano-micro scaleare limited to fluorescent molecules and luminescent nanocrystals, whosespectral properties respond to temperature variation. The principle ofoperation of these conventional temperature probes is typically related totemperature induced multiphonon quenching or temperature dependent energytransfers, therefore, above 12%/K sensitivity and high thermal resolutionremain a serious challenge. Here we demonstrate a novel class of highlysensitive thermographic phosphors operating in room temperature range withmilikelvin thermal resolution, whose temperature readings are reproducible,luminescence is photostable and brightness is not compromised by thermalquenching. Corroborated with phase transition structural characterization andhigh spatio-temporal temperature imaging, we demonstrated that optically activeeuropium ions are highly and smoothly susceptible to monoclinic to tetragonalphase transition in LiYO2 host, which is evidenced by changed number and thesplitting of Stark components as well as by smooth variation of contributionbetween magnetic and electric dipole transitions. Further, reducing the size ofphosphor from bulk to nanocrystalline matrix, shifted the phase transitiontemperature from 100oC down to room temperature. These findings provideinsights into the mechanism underlaying phase transition based luminescencenanothermometry and motivate future research toward new, highly sensitive, hightemporal and spatial resolution nano-thermometers aiming at precise studyingheat generation or diffusion in numerous biological and technologyapplications.

Phase transition facilitated highly sensitive luminescence nanothermometry and thermal imaging