Structural and optical properties in Tm³⁺/Tm³⁺–Yb³⁺ doped NaLuF₄ glass‐ceramics

Abstract

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A novel optical thermometry strategy based on emission of Tm3+/Yb3+ codoped Na3GdV2O8 phosphors

“…The UC emission spectra are composed of two visible emission bands arising from the Tm 3+ transitions 1 G 4 → 3 H 6 (475 nm) and 1 G 4 → 3 F 4 (651 nm), the strong emission at 800 nm is attributed to the 3 H 4 → 3 H 6 transition in the first biological window. The DS emission spectra in the third biological window at 1625 nm is attributed to the transition 3 F 4 → 3 H 6 28 so they are especially appealing from a biological point of view. The NGVO:Tm 3+ ,Yb 3+ exhibit a stronger NIR emission at low excitation density, which has potential uses in deep tissue imaging, optical signal amplification and other fields.…”

The influence of Al2O3 concentration on the NaYF4 crystallization in oxyfluoride glass–ceramics

“…A similar amount of fluorine loss was reported in other oxyfluoride silicate glasses. 11,26 Due to the high melting temperatures involved (1650 • C), such substantial fluorine losses are common in these compositions.…”

Multifunctional Optical Sensing with Lanthanide-Doped Upconverting Nanomaterials: Improving Detection Performance of Temperature and Pressure in the Visible and NIR Ranges

“…They possess numerous energy levels that span a broad spectroscopic range, extending from the ultraviolet to near-infrared. In addition, Yb 3+ is frequently chosen as the sensitizer codoped with active lanthanide ions due to its two energy levels, which result in a greater absorption cross section at 975 nm and an efficient transfer of energy to adjacent lanthanide ions. − Recently, an Er 3+ /Tm 3+ /Yb 3+ -tridoped system has attracted great interest for optical temperature sensing and white light UC emission. For example, Passuello et al reported a nanocrystalline gadolinium oxyfluoride sample doped with Er 3+ , Tm 3+ , and Yb 3+ for white light UC emission .…”