Sol-Gel Synthesis and Optical Temperature Sensing Behavior of Double-Perovskite Gd₂ZnTiO₆:Yb³⁺/Er³⁺ Phosphors

Abstract

The Gd2ZnTiO6:Yb3+/Er3+ phosphors (abbreviated as GZT:Yb3+/Er3+) have been successfully prepared by means of the sol-gel method. The GZT:Yb3+/Er3+ phosphor exhibits intense green upconversion (UC) emission bands near 525/547 nm (2H11/2/4S3/2→4I15/2) and weak red UC emission band near 663 nm (4F9/2→4I15/2) upon the 980 nm laser excitation. Furthermore, the sample simultaneously emits near-infrared centered at 1527 nm associated with 4I13/2→4I15/2 transition of Er3+ ions. The high thermal activation energy (0.34 eV) of the GZT:Yb3+/Er3+ phosphor is determined via the temperature dependent luminescence spectra upon the 980 nm laser excitation (low power density: 0.8W/cm2). Two thermally coupled levels (2H11/2/4S3/2) for Er3+ using the fluorescence intensity ratio (FIR) technology were studied in detail. The maximum absolute sensitivity (90.11 × 10−4 K−1 at 539 K) of the targeted phosphor is determined from the experimental results. All results demonstrate a potential of application of as-prepared GZT:Yb3+/Er3+ phosphors in optical thermometry.

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

“…Such materials are studied as potential phosphors for up-conversion, 12 displays, 13 and luminescent thermometers. [14][15][16][17][18][19] In particular, barium magnesium tungstate with the formula Ba 2 MgWO 6 , abbreviated as BMW, has been studied extensively 18,[20][21][22][23][24][25][26][27][28][29] due to its high symmetry confirmed by the Goldschmidt tolerance factor (1) being very close to 1.…”

“…[32][33][34][35][36] The usefulness of Er 3+ /Yb 3+ doped YAG nanoparticles in luminescence thermometry has recently been presented. 37 Several double-perovskite hosts were studied with Er 3+ , among which NaLaMgWO 6 , 38 LiLaMgWO 6 , 39 Ba 2 CaWO 6 , 40 Gd 2 ZnTiO 6 , 41 and Ba 2 LaNbO 6 42 were studied for application in luminescence thermometry. Most of them reported relative sensitivities ranging from 0.9% K −1 to 1.5% K −1 , which is sufficiently high to justify interest in this family of materials.…”

“…Such materials are studied as potential phosphors for up-conversion, 12 displays, 13 and luminescent thermometers. 14–19…”