Luminescence properties of Yb³⁺-doped SrTiO₃: the significance of the oxygen–titanium charge transfer state on photon downshifting

Abstract

Photon downshifting in SrTiO3:Yb3+ to wavelengths where a PV cell has its higher spectral responsivity is achieved upon UV excitation through an energy transfer process from a ligand-to-metal-charge transfer O2− → Ti4+ state to the Yb3+ excited state.

Electrochemical Crystal Growth of Titanium Oxyfluorides—A Strategy for Development of Electron-Doped Materials

“…A broad absorption band split into two components at 520 and 570 nm was similarly observed in LaMgAl 11 O 19 :Ti 3+ single crystals . For the oxyfluoride crystals, the absorption band at 410 nm may be attributed to the ligand-to-metal charge transfer (LMCT) . Meanwhile, the absorption band at 625 nm can be ascribed to the d–d transition of Ti 3+ , as previously observed in K 3 Ti 3+ F 6 .…”

“…65 For the oxyfluoride crystals, the absorption band at 410 nm may be attributed to the ligand-to-metal charge transfer (LMCT). 66 Meanwhile, the absorption band at 625 nm can be ascribed to the d−d transition of Ti 3+ , as previously observed in K 3 Ti 3+ F 6 . 67 Most of the Ti 3+ -containing oxides are dark blue-black in color, albeit small Ti 3+ contents (e.g., Ti 8 O 15 ; V Ti = +3.75).…”

A Recent Development of Luminescence Properties of Yb3+ Doped Metal Halide Perovskites Nanocrystals for Photonic Applications: A Review

“…In 2019, German Lopez-Pacheco et al [7] investigated the results of a polymeric complex method that was utilized to create ceramic powders from solid solutions of Sr1-1.5xYbxTiO3 (x = 0.0, 0.0125, 0.025, 0.05, and 0.075). We looked examined the crystal structure, microstructure, and optical properties of powders that had been annealed for an hour at 800 degrees Celsius.…”