Dual mode temperature sensing through luminescence lifetimes of F- and O-coordinated Cr³⁺sites in fluorosilicate glass-ceramics

Abstract

International audienceLuminescence lifetime based temperature sensing has an intrinsic immunity to the influence of external conditions, and dual mode thermometry is highly accurate due to its "self-calibration" merit. To develop thermometry with both features, we investigated the phase and microstructural evolution of Cr3+-doped calcium-fluorosilicate glass and glass-ceramics, which revealed different luminescent behavior relating to the different Cr3+ sites in the materials. From the photoluminescence (PL) spectra, the emission at 717 nm was derived from the O-coordinated octahedral sites, while the 1 μm super-broad emission was assigned to the F-coordinated octahedral sites. After an annealing treatment, cubic CaF2 nanocrystals were homogeneously precipitated in the glass-ceramics; thus, both the O-coordination in the residual glass phase and F-coordination in the CaF2 crystalline phase were strengthened. This led to the enhancement of both the emissions at 717 nm and 1 μm. The O-coordinated sites were relatively strong-field sites in which the fluorescence of Cr3+ originated from the radiative transitions of the two thermally coupled energy levels, 2E and 4T2, while the F-coordinated sites were relatively weak-field sites. Hence, the Cr3+ exhibits only one excited state 4T2, which is inactivated by radiative transitions and non-radiative transitions from the thermal quench. Based on the obtained results, the maximum relative temperature sensitivity coefficients are 0.76% K-1 at 498 K for the 717 nm emission and 0.47% K-1 at 351 K for the 1 μm emission. This provides the possibility of developing a dual mode temperature sensor with high precision only using a single material. © 2017 The Royal Society of Chemistry

Multi‐phase glass‐ceramics containing CaF2: Er3+ and ZnAl2O4:Cr3+ nanocrystals for optical temperature sensing

“…Here, C is the degeneration ratio with a value of 3, ΔE is the energy gap between the two excited states 2 E, 2 T 1 , and 4 T 2 , k B is the Boltzmann constant and T is the absolute temperature. By solving Equations ( and ), the temperature‐dependant lifetime can be calculated by the following equation: …”

“…The Ln 3+ ‐doped based optical thermometers are primarily based on temperature correlated fluorescence intensity ratio (FIR) of thermally coupled energy levels, such as 2 H 11/2 and 4 S 3/2 of Er 3+ ions . Whereas, the TM ions‐doped optical thermometers are based on the temperature‐dependent fluorescence decay lifetime, such as chromium's (Cr 3+ ) fluorescence lifetime of the transition between two thermal coupled energy levels ( 2 E and 4 T 2 ) . FIR‐based thermometry has the intrinsic property of being independent from spectral losses and fluctuations and thus proven to be very accurate and reliable .…”

Structural Origins of BaF2/Ba1 −xRxF2 +x/RF3 Nanocrystals Formation from Phase Separated Fluoroaluminosilicate Glass: A Molecular Dynamic Simulation Study

“…For example, the Ba 2 LaF 7 :Ln 3+ containing glass-ceramics have extraordinary UC luminescence property, being a potentially candidate for random lasing action, [4,5] optical thermometry, [6] and green phosphors in white light-emitting diodes. [9][10][11][12] Previous researches revealed that the unique connection between the chemical state of dopants and topology of the disordered glass structure in oxide glass system. [8] Different luminescent centers have coordination preferences in oxide or fluoride environment.…”

“…Different luminescent centers have coordination preferences in oxide or fluoride environment. Normally, most of the Ln 3+ is found to enrich in the fluoride phase, while the transition metal ions can enrich in the oxide or fluoride phase depending on other glass modifier cations in the composition . Previous researches revealed that the unique connection between the chemical state of dopants and topology of the disordered glass structure in oxide glass system .…”

The Impact of Cr3+ Doping on Temperature Sensitivity Modulation in Cr3+ Doped and Cr3+, Nd3+ Co-doped Y3Al5O12, Y3Al2Ga3O12, and Y3Ga5O12 Nanothermometers

“…In response to the requirements imposed by technology, micro/nanoelectronics or photonics as well as by biomedical applications, new approaches to the luminescent nanothermometers (LNTs) have to be proposed to secure fast and accurate temperature sensing with submicrometer spatial resolution, and highly sensitive temperature readout (Brites et al, 2012; Jaque and Vetrone, 2012; Chen et al, 2016; del Rosal et al, 2016a,b; Dramićanin, 2016; Marciniak et al, 2016b; Suo et al, 2017; Wang et al, 2017; Gao et al, 2018; Liao et al, 2018; Liu et al, 2018; Malysa et al, 2018; Runowski et al, 2018; Zhong et al, 2018). One of the most promising one, relies on exploiting transition metal (TM) ions, whose highly temperature dependent emission is referred to emission of barely temperature dependent lanthanides ions (Marciniak et al, 2017a; Drabik et al, 2018; Elzbieciak et al, 2018; Kniec and Marciniak, 2018; Marciniak and Trejgis, 2018; Trejgis and Marciniak, 2018).…”