Er³⁺‐Yb³⁺ ions doped fluoro‐aluminosilicate glass‐ceramics as a temperature‐sensing material

Abstract

The transparent Er3+‐Yb3+‐doped fluoro‐aluminosilicate glass‐ceramic (GC) was prepared by melt‐quenching. The crystal phase, morphology, and up‐conversion (UC) luminescence of as‐produced GC were characterized by X‐ray diffraction, scanning electron microscopy, and fluorescence spectrophotometry, respectively. The results show that BaYF5 nanocrystals were uniformly distributed in the glass matrix of the as‐produced GC. When the as‐produced GC was subjected to heat treatment, the crystallinity was increased, but the crystal identity remains unchanged. Such heat‐treatment doubled the intensity of the UC luminescence, and this enhancement was ascribed to the increased incorporation of both Er3+ and Yb3+ ions into the lower phonon energy environment of BaYF5 nanocrystals. Furthermore, the heat‐treated GC was stable against further crystallization, and consequently its UC luminescence was stable at the application temperature. The heat‐treated GC was found to possess an outstanding temperature‐sensing capability.

The Transformation from Translucent into Transparent Rare Earth Ions Doped Oxyfluoride Glass‐Ceramics with Enhanced Luminescence

“…This implies that the glass network connectivity increases with DSC scans, and reaches a maximum, due to the cease of crystallization. [ 18 ] To study the first crystallization event of both P‐GC and the heat‐treated P‐GC samples, the crystallization enthalpy (Δ H ) of each sample was calculated by integrating the exothermic peak (Figure 1b). It is evident that Δ H gradually decreases with increasing HT temperature, implying that the crystallization already takes place during HT.…”

Two‐wavelength excitation–driven robust operation of green up‐conversion emission in Er3+‐doped oxyfluoride glass–ceramic

“…6–342) phase are clearly observed, indicating that the NaYF 4 nanocrystals have successfully precipitated into the PG after heat treatment. According to the width of the diffraction peak, the size of the grain can be calculated by the Scherer formula 35–37 : $$$$\begin{equation}D = \frac{{K\lambda }}{{\beta {\rm{\;cos}}\theta }}\end{equation}$$$$…”

Negative lattice expansion-induced upconversion luminescence thermal enhancement in novel Na2MoO4:Yb3+, Er3+ transparent glass ceramics for temperature sensing applications

“…In terms of TeO 2 -based glass: Yb 3+ , Er 3+ combined with NMO-10 TGC, the maximum S r values were as high as 3.14% K À1 at 313 K when the combination of I NIR /I 550 was applied. Furthermore, temperature uncertainty (dT) is another key performance index for determining the thermal-sensing property of an optical [45][46][47][48][49][50][51][52][53] thermometer. It not only involves the S r of a temperature probe, but also the error of the intensity ratio, which is expressed using the following equations.…”

“…(g) Alternating stimulation between 313 and 573 K, showing the variation of FIR NIR/550 over ten cycles. (h) Summary of temperature relative sensitivity for some glass systems in previous publications [45][46][47][48][49][50][51][52][53].…”