Silica-based oxyfluoride glass and glass-ceramic doped with Tm3+ and Yb3+ -VUV-VIS-NIR spectroscopy and optical thermometry

Abstract

Optical, structural and morphological properties of Tm 3+ /Yb 3+ co-doped NaYF4-based nanoglass-ceramic and a precursor glass have been investigated. The controlled heat-treatment of multicomponent oxyfluoride glass at 640 o C for 2h was used to obtain crystalline precipitations. The differences in optical characteristics have been discussed analysing spectra recorded within wide VUV-VIS-NIR spectral range and considering relaxation dynamic of involved excited states. Optical spectra and luminescence decay curves were measured as a function of temperature in the range of 295-725 K. Based on up-converted emission spectra excited at 975 nm, temperature sensing properties of glass-ceramic were verified. The fluorescence intensity ratio between the up-converted emission bands located at around 795 nm (Tm 3+ : 3 H4-3 H6) and 695 nm (Tm 3+ : 3 F3,2-3 H6) was studied. The maximum relative temperature sensitivity was determined to be 0.35% K-1 at 445 K.

Near-IR Luminescence of Rare-Earth Ions (Er3+, Pr3+, Ho3+, Tm3+) in Titanate–Germanate Glasses under Excitation of Yb3+

“…One should remember that the following lanthanides Ln 3+ ions such as Pr 3+ , Er 3+ , Tm 3+ , and Ho 3+ are proposed as co-activators for photoluminescence in Yb 3+ /Ln 3+ -doubly doped glasses owing to their favorable location of energy levels and the possibility of radiative transitions at the infrared [ 23 ]. Among them, Tm 3+ [ 24 ] has gained increasing attention because the near-IR emission associated with the 3 F 4 → 3 H 6 transition at 1800 nm is useful as a medical light source. The Er 3+ ions [ 25 ] are widely used in materials for optical applications.…”

Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices

“…The conventional melt-quenching method followed by controlled heat-treatment at specified time and temperature conditions is currently the most widely used technique for fabricating the class of oxyfluoride GCs [32][33][34][35][36]. On the other hand, the high melting temperatures of glass-forming components (e.g., 1450 • C, 1500 • C [37][38][39]) increase the risk of volatilization of the fluoride compounds, which may adversely affect the crystallization process of the fluoride fraction.…”

Yb3+/Tm3+ co-doped germanate-tellurite glass: conversion luminescent and temperature-sensing characteristics

“…Tm 3+ ions are considered as excellent rare earth ions for infrared optical devices and up-conversion solid-state lasers due to their very rich energy level distribution, large excited emission cross section and long fluorescence lifetime [11] . Temperature sensing applications based on the 3 F2,3 and 3 H4 energy levels of Tm 3+ ions have been reported [12] , but the measured up-conversion fluorescence intensity is weak due to the small absorption cross-section of Tm 3+ ions in the 808 nm band, leading to low accuracy of the measurements. There is no absorption peak of the Tm 3+ ions at 980 nm, and in order to achieve strong up-conversion luminescence, Yb 3+ ions were used to sensitize the Tm 3+ ions [13] .…”