Structural, optical spectroscopy and energy transfer features of Tb³⁺-activated (Y, Gd)F₃ nanophosphors for UV-based LEDs

Abstract

Rare earth activated nano-fluorides have attracted the scientific community through their interesting optical properties and diversified applications endowed by low phonon energy. In the present work, a series of (Y0.95-x,...

Th4+ Co‐doped YF3 : Yb3+, Er3+ Nanostructures for Enhanced Visible and NIR‐II Emissions and Potential Application as Cryogenic Thermometer

“…The peaks around 475 cm −1 , 390 cm −1 , and 390 cm −1 could be assigned to B 1g modes. The strong low phonon frequency bands at ~224 cm −1 and 305 cm −1 can be endowed to B 2g symmetric modes and A g vibration modes [10b,24] . The presence of characteristic peaks in all the three representative samples confirmed the orthorhombic phase of YF 3 nanomaterials and correlated well with the XRD analysis.…”

A Novel Zero-Thermal-Quenching Red Phosphor with High Quantum Efficiency and Color Purity

“…Figure 9 is the schematic diagram of the energy transfer between Gd 3+ and Sm 3+ io Although Sc 3+ , Y 3+ and Gd 3+ are all categorized as inert rare earth ions that do not em light in the visible region [46][47][48], unlike empty filled 4f 0 for Sc 3+ and Y 3+ ions, the 4f el tron orbitals of Gd 3+ (4f 7 ) are half filled, which allows energy transfer through f-f leaps fr Gd 3+ ions to luminescent center ions [49,50]. In the case of Gd 3+ ions being excited, electro According to Table 2, the order of radius difference between Ln 3+ ions and La 3+ ion is D r (Sc 3+ ) > D r (Y 3+ ) > D r (Gd 3+ ), so the Sc 3+ ions co-doped phosphors should have the strongest gain effect.…”