The concept of optical temperature sensing using band intensity ratio is considered as one of the most effective, self‐reference, non‐invasive, and rapid detection techniques for the local temperature in natural or engineered systems. In this work, for the first time a divalent lanthanide‐co‐doped dual‐center system, i.e., SrB4O7:Eu2+/Sm2+ phosphors, working as a bifunctional ratiometric sensor of temperature and pressure is employed. With temperature alterations, the Eu2+/Sm2+ luminescence intensity ratio and the emission lifetime of Sm2+ are significantly changed, showing unprecedentedly high relative sensitivity of 45.6 and 3.17% K‐1, respectively. Moreover, in the pressure range from ≈10 to 40 GPa, the intensity ratio of the Eu2+/Sm2+ emissions shows strong pressure dependence and can be utilized for pressure monitoring, with high pressure relative sensitivity of ≈13.8% GPa‐1. The superior performance indicates that the developed dual‐center Eu2+/Sm2+‐co‐doped SrB4O7 phosphors are promising candidates for supersensitive optical sensing applications. The findings open a new approach of designing optical temperature and pressure sensors.

Supersensitive Ratiometric Thermometry and Manometry Based on Dual‐Emitting Centers in Eu2+/Sm2+‐Doped Strontium Tetraborate Phosphors

The rational exploration of lanthanide-doped phosphors is of great significance for realizing precise optical temperature sensing and information security applications. Here, triple-wavelength responsive Ba2Ga2GeO7:Er3+ phosphors were synthesized by a solid-state method, and the samples gave highly pure green emissions under 808 and 382 nm excitations. Within the temperature range from 313 to 573 K, the corresponding temperature sensing performance based on the fluorescence intensity ratio was estimated, and the maximum relative sensing sensitivities were determined to be 0.97%, 1.20%, and 1.19% K–1 for the 980, 808, and 382 nm excitations, respectively, indicating the title materials are promising for use in temperature sensors. Furthermore, the introduction of Tb3+ enables the materials to realize down conversion luminescence and long persistent luminescence, which greatly enrich the luminescence phenomena of the samples. Based on the abundant emission modes, novel information encryption strategies of digital displays and binary digital-ASCII multiplex codes are proposed, which provide reliable guidance on advanced visualized information encryption. 

Multiwavelength Responsive Luminescence for Temperature Sensing and Visualized Information Encoding/Decoding Based on Er3+/Tb3+-Doped Ba2Ga2GeO7 Phosphors

Designing orange-red emitting luminescent platform for data security and information encryption based Sm3+ doped BLAO phosphor

Rare-earth-free Mn4+ ions activated Ba2YSbO6 phosphors for solid-state lighting, flexible display, and anti-counterfeiting applications

Customization of novel double-perovskite (Ca,Sr)2InNbO6:Mn4+ red-emitting phosphors for luminescence lifetime thermometers with good relative sensing sensitivity

Constructing novel red-emitting Ba2Y0.8Eu0.2NbO6:Mn4+ phosphors for multi-type luminescent thermometers and high-security anti-counterfeiting films

Due to a number of its advantages, luminescence thermometry has been a strongly developed strand of temperature metrology over a period of time. Although there are several different types of luminescent thermometers, recently attention has been focused on a new single-band ratiometric approach, which is based on the excited state absorption phenomenon. Nevertheless, since this process is nontrivial and has not been studied extensively in the context of thermometry to date, a number of studies are necessary to enable the intentional development of highly sensitive thermometers based on this method. One of the important aspects is to investigate the influence of material size and the associated occurrence of surface effects, which is considered in this work. In addition, the research in this paper has been extended to explore the aspect of host material composition. Accordingly, nanocrystals and microcrystals of β-NaYF4:2%Nd3+, β-NaGdF4:2%Nd3+, and LiGdF4:2%Nd3+ were investigated in this work. The influence of surface effects on thermometric parameters was proved, with special emphasis on the useful temperature range. Thus, by increasing the particle size, it was possible to intentionally extend the useful range by even more than 100 K. 

/pdf/modulation-of-thermometric-performance-of-single-band-2arkac97.pdf

Modulation of thermometric performance of single-band-ratiometric luminescent thermometers based on luminescence of Nd3+ activated tetrafluorides by size modification

/pdf/author-correction-modulation-of-thermometric-performance-of-3mvt0snv.pdf

Author Correction: Modulation of thermometric performance of single-band-ratiometric luminescent thermometers based on luminescence of Nd3+ activated tetrafluorides by size modification

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Constructing novel red-emitting Ba2Y0.8Eu0.2NbO6:Mn4+ phosphors for multi-type luminescent thermometers and high-security anti-counterfeiting films

Modulation of thermometric performance of single-band-ratiometric luminescent thermometers based on luminescence of Nd3+ activated tetrafluorides by size modification

Author Correction: Modulation of thermometric performance of single-band-ratiometric luminescent thermometers based on luminescence of Nd3+ activated tetrafluorides by size modification