An Er³⁺ doped Ba₂MgWO₆ double perovskite: a phosphor for low-temperature thermometry

Abstract

Bifunctional luminescent material is one of the most intriguing topics in recent years with significant growth in number of investigations. Herein, we report the potential of Ba2MgWO6 doped with Er3+...

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A2MgWO6 Doped with Dy3+ (A = Ca, Sr, Ba)

“…The significant dependency of luminescence intensity on temperature is a fascinating characteristic that can be harnessed for temperature readout, especially noncontact thermometry, utilizing the ratiometric luminescence of the host and dopant ions, such as [Ti 2 O 7 ] and Eu 3+ , 54 VO 4 3– and Eu 3+ , 55 [WO 6 ] and Ho 3+ , 56 Eu 3+ , 10 Nd 3+ , 18 Er 3+ . 17 In this study, we propose an approach to design a thermometer based on the relationship between the [WO 6 ] host emission (I) and the emission of 4 F 9/2 → 6 H 15/2 (II), and 4 F 9/2 → 6 H 13/2 (III) (see Figure 8 ). The fluorescence intensity ratio (FIR) parameter was modified due to the substantial overlap between channels (I) and (II), becoming the ratio of the maximum of channels (II) and (III) to the maximum of channel (I).…”

“…Many double perovskites have been reported so far, with the most common divalent cations at the A-site are Ca, Sr, and Ba . Among them, tungstate double perovskite materials A 2 MgWO 6 have emerged as promising candidates for light-emitting diodes (LEDs) − and temperature readout applications ,,, because of their high thermal stability, and broad absorption band in the UV range. To adjust the luminescent properties of materials, a common way is to alter the cation A .…”

“…Notably, Ba 2 MgWO 6 (BMW) exhibits intense blue emission from the [WO 6 ] host . Leveraging the simultaneous emission of [WO 6 ] and the dopant, BMW-doped lanthanides have been widely investigated for white-light emission and self-reference optical thermometers . Furthermore, substituting Sr for Ba in BMW caused a blueshift in both excitation and emission spectra, along with a structural change from cubic to tetragonal .…”

“… 10 Leveraging the simultaneous emission of [WO 6 ] and the dopant, BMW-doped lanthanides have been widely investigated for white-light emission and self-reference optical thermometers. 17 Furthermore, substituting Sr for Ba in BMW caused a blueshift in both excitation and emission spectra, 16 along with a structural change from cubic to tetragonal. 11 More importantly, a phase transition in Ba (2 – x ) Sr x MgWO 6 :Er,Yb resulted in an improvement in the maximum relative sensitivity of the thermometer, increasing from 0.8%/K to 0.9%/K, respectively.…”