Intense up-conversion emission from Er³⁺/Yb³⁺ ion co-doped transparent oxyfluoride glass-ceramics containing Y₅O₄F₇ nanorods for optical thermometry

Abstract

Formation of orthorhombic Y5O4F7:Er3+,Yb3+ nanorods in oxyfluoride glass-ceramics to realize intense up-conversion emission for application in optical thermometry.

Structural Studies of Rare Earth-Doped Fluoroborosilicate Glasses by Advanced Solid-State NMR

“…Therefore, they are suitable hosts for luminescent REI and are considered to be promising optical materials with extensive applications. White light emission has been achieved in Ce 3+ /Dy 3+ , Eu 3+ /Tb 3+ /Dy 3+ , and Tm 3+ /Tb 3+ /Eu 3+ REI-codoped oxyfluoride glasses under near-ultraviolet light excitation, showing potential applications in red–green–blue (RGB) combination white light generation. − The temperature-dependent upconversion fluorescences have been observed in Er 3+ (Er 3+ /Yb 3+ )-doped oxyfluoride glasses, making such materials to be potential candidates for temperature sensing. , The integral scintillation efficiencies of Tb 3+ ions in oxyfluoride borogermanate and oxyfluoride silicate glasses were found to be about 26.9 and 68.0%, respectively, of the standard Bi 4 Ge 3 O 12 (BGO) scintillating crystal, showing prospective applications in high-resolution X-ray imaging. , Moreover, the REI-doped oxyfluoride glasses can be processed under appropriate heat treatment into glass ceramics containing various fluoride crystals, such as MF 2 (M = Pb, Cd, Ca, Ba), − NF 3 (N = La, Y), − and AREF n (A = K, Na, Ba; RE = Y, Yb, La, Lu, Gd). − These materials can be used in optical amplifiers, upconversion devices, solid-state lasers, optical thermometry, etc. ,− The local structures of glasses have a significant effect on the luminescence properties of REI. Although considerable luminescence performances have been reported for these materials, the fundamental local structure information is rarely reported.…”

Transparent Aluminosilicate Oxyfluoride Glass Ceramics Containing Upconversion Luminescent CaF2 Nanocrystals: Glass-to-Crystal Structural Evolution Studied by the Advanced Solid-State NMR Spectroscopy

“…In these cases, REIs-doped bulk transparent oxyfluoride glass ceramics containing fluoride crystalline phases might be an ideal choice. Such materials combine the advantages of high chemical and mechanical stability of oxygen glasses as well as low phonon energy of fluoride glasses, making them promising in optical amplifiers, upconversion devices, solid-state lasers, optical thermometry, etc. − Wang and Ohwaki first prepared transparent oxyfluoride glass ceremics containing Pb x Cd (1– x ) F 2 nanocrystals. The obtained upconversion (UC) emission intensity was 100 times larger than that of corresponding precursor glasses, making a critical progress toward the practical applications of upconversion oxyfluoride glass ceramics …”

In Situ Synthesis of β-Na1.5Y1.5F6: Er3+ Crystals in Oxyfluoride Silicate Glass for Temperature Sensors and Their Spectral Conversion and Optical Thermometry Analysis

“…The energy gap ∆E between the 2 H 11/2 and 4 S 3/2 levels and the pre-exponential constant C can usually be calculated using one of two approaches: (1) intensity ratio of 2 H 11/2 and 4 S 3/2 levels (FIR) can be plotted against absolute temperature (T) and fitted by exponential function; and (2) the linear fit of the graph plotted ln (FIR) vs. 1/T. The ∆E values obtained from these two approaches identical [33,34]. The first approach has been adapted in the present case.…”