Pressure-induced structural phase transition, irreversible amorphization and upconversion luminescence enhancement in Ln³⁺-codoped LiYF₄ and LiLuF₄

Abstract

Lanthanide ions (Ln3+) codoped inorganic materials have been widely studied for their unique upconversion luminescence (UCL) performance, which can be employed for promising applications in imaging, sensing, detection and treatment....

Co-doped modified LiLuF4:Eu microcrystalline scintillator-based flexible film for high resolution X-ray imaging

“…These features endow LiLuF 4 -based crystals with high potential as a scintillation matrix for X-ray imaging. 28–30 The selection of stable and environmentally friendly rare earth dopant ions is crucial for enhancing scintillation performance. Due to its unique 4f electronic structure and superior red luminescence, Eu 3+ has been suitable as the luminescent center for red-emitting materials.…”

Photon upconversion of Nd3+–Yb3+–Tb3+ doped core–shell–shell–shell nanoparticles

“…Researchers have tried to utilize different strategies such as changing the host lattice, energy transfer, surface passivation, surface plasmon coupling, and photonic crystals to modulate rare-earth luminescence. 17–27 For example, Yan et al built a NaGdF 4 :Yb/Er@NaGdF 4 :Nd/Yb core–shell structure, in which Er 3+ and Nd 3+ were doped separately in the core and shell, and the energy back transfer process can be inhibited through spatial separation. 28 Furthermore, Yao et al synthesized sandwich-structured nanoparticles (NPs) including a NaYF 4 :Yb quenching-shield layer between the activator core and Nd 3+ doped shell.…”

NIR II-responsive core–shell La2O2S:Er3+@La2O2S nanoparticles towards 1.5 μm photodetection

“…It is an ideal candidate for highly sensitive photoactive materials due to its large anti-Stokes shift, excellent photostability, no auto-fluorescence and low toxicity. 9–12 Among the traditional UCL materials, β-NaYF 4 :Yb 3+ ,Er 3+ is normally recognized as the most efficient upconversion phosphor, whose up-conversion quantum yield (UCQY) is about 3–4% under 980 nm excitation. 13 In the past few years, the combination of β-NaYF 4 with semiconductor materials effectively achieved the NIR-I (700–1000 nm) photoelectric detection.…”