Eu³⁺‐Activated Gd₈V₂O₁₇: Energy Transfer, Luminescence, and Temperature‐Dependence Characteristics

Abstract

A new phosphor of the type Gd Eu V O (x=0-1.0) was synthesized through the solid-state reaction ceramics method. A pure phase formation was verified by using X-ray powder diffraction measurements. The luminescence of Gd V O :Eu was investigated through optical and laser excitation spectroscopy. The luminescence curves were investigated in the temperature region 10 to 300 K. Gd V O shows a self-activated luminescence under excitation with UV- and near-UV light. The spectra, the decay lifetimes, and the thermal stability of Gd Eu V O (x=0.005-1.0) strongly depend on both the Eu concentration and the temperature. The tunable luminescence is realized by controlling the Eu -doping level to adjust the host energy-transfer efficiency from the VO groups to the Eu activators. At low Eu concentrations (<30 mol %), the intensity and lifetime show an unusual change with an increase of the temperature from 10-300 K, that is, the luminescence experiences a straightforward enhancement. The energy transfer from the VO group to the Eu ions could be accelerated with an increase of the temperature resulting in an unusual enhancement of the Eu luminescence and lifetime. However, the emission of the Eu ions decreased for highly Eu-doped samples (>30 mol %) with an increase of the temperature. The luminescence mechanism was discussed on the basis of the charge-transfer band of the Eu ions, the doping concentration, and the proposed microstructures in the lattices.

Dynamically tunable multicolor emissions from zero-dimensional Cs3LnCl6 (Ln: europium and terbium) nanocrystals with wide color gamut

“…61 The E a for Eu 3+ emission is influenced by several factors, such as the host structure 56,62 and doping concentration of Eu 3+ ions. 63 The high Eu 3+ concentration in our Cs 3 EuCl 6 NCs may facilitate thermally activated concentration quenching between Eu 3+ emission centers, resulting in small E a for thermal quenching. We further investigated the tunable multicolor PL properties using Cs 3 TbCl 6 NCs.…”

Cerium Doping Double Perovskite Scintillator for Sensitive X‐ray Detection and Imaging

“…As we know, rare earth ions with abundant energy levels are natural luminescent materials. [19][20][21] Especially the radioluminescence light yield of Tb-based double perovskite show 46600 ph/MeV, [22] which is better than commercial scintillator LYSO (33200 ph/MeV). [23] Therefore, the double perovskite with can be regarded as a good prospect in X-ray detection and imaging applications.…”

Structure-dependent luminescence of Eu3+-doped strontium vanadates synthesized with different V : Sr ratios – application in WLEDs and ultra-sensitive optical thermometry

“…12a), plausibly due to a less efficient VO 4 -Eu 3+ charge transfer promoted at lower temperature. 72 The significant increase of the LIR values causes a shift of the band centroid (integrated over the spectral range encompassing CTB and Eu 3+ emissions, i.e., from 450 to 710 nm) and changes in the color coordinates in the chromaticity diagram (Fig. 11b), allowing temperature-controlled emission color tuning.…”