Optical temperature sensing by upconversion luminescence of Er doped Bi5TiNbWO15ferroelectric materials

Abstract

The Er3+ doped Bi5TiNbWO15 ceramics have been synthesized using conventional solid-state reaction techniques. The crystal structure, ferroelectric properties, UC emission properties and especially the temperature sensing behaviors were systematically studied. With increasing Er3+ content, the investigation of XRD pattern, the ferroelectric loop and the UC emission indicated that the Er3+ ions dopants preferentially substituted the A sites of Bi3TiNbO9 and then Bi2WO6. Based on fluorescence intensity ratio (FIR) technique, the observed results implied the ceramics were promising candidates for temperature sensors in the temperature range of 175 K −550 K. More importantly, this study provided a contrast of temperature sensitivity between emission from the same part (Bi3TiNbO9) in bismuth layered-structure and emission from the different part (Bi3TiNbO9 and Bi2WO6) in bismuth layered-structure for the first time.

Temperature-Sensing Behavior Based on Upconversion Luminescence at the Rhombohedral–Tetragonal Phase Boundary

“…For comparison, the theoretical maximum value S R and corresponding temperature for other Er 3+ -doped materials in the literature, which include oxides, fluorides and glasses, are also shown in Table I. [24][25][26][27][28] Here, the maximum S R (0.0037 K À1 ) is obtained for KNNE ceramics, which is similar to other Er 3+ -doped materials. Thus, it can be concluded that the KNNE ceramics have great potential for the development of temperature sensors.…”

Investigation on optical temperature sensing behaviour via Ag island-enhanced luminescence doped β-NaGdF4:Yb3+/Tm3+ films/microfibers

“…The results in the study indicate that the waveguiding performance of microfibers is quite similar to that reported previously. 29,30 …”

“…The results in the study indicate that the waveguiding performance of microbers is quite similar to that reported previously. 29,30 Fig. 6 Lifetime decay curves of b-NaGdF 4 :Yb 3+ /Tm 3+ thin films with and without silver.…”

Promising Er3+/Yb3+-Codoped GdBiW2O9 Phosphor for Temperature Sensing by Upconversion Luminescence

“…Recently, tungstate materials have fascinated huge curiosity for luminescence applications because of the strong and broad absorption band of the W–O bond and its chemical and thermal stability. − Owing to this, the tungstate materials including CdWO 4 , CaWO 4 , and KGd­(WO 4 ) 2 can be used for various applications in the fields of scintillators, phosphors, and laser materials. − However, there is a lack of proper research work reported on the luminescent thermometric characteristics of tungstate-based phosphors. Therefore, in this paper, a new Er 3+ /Yb 3+ -codoped phosphor based on the GdBiW 2 O 9 host was successfully developed via a solid-state approach, and the structure and UC characteristics were investigated.…”