NIR Luminescence Enhancement of YVO4:Nd Phosphor for Biological Application

Tunable luminescence thermal stability in YVxAs1−xO4:Eu3+ through the introduction of As5+ ions for remote temperature sensing applications

“…The bands at 850-900 cm À1 are associated with the asymmetric stretching vibration in AsO 4 23 and symmetric stretching vibration in VO 4 . 25 An inverse correlation between symmetry stretching and asymmetry stretching is observed at 800-850 cm À1 , where the lines are connected to the symmetric stretching mode in AsO 4 and asymmetric stretching mode in VO 4 . In general, the symmetric stretching vibrations in AB 4 groups are typically IR-forbidden, but can be observed as IRactive following T d symmetry distortion.…”

“…Due to their luminescence properties, yttrium orthovanadates activated with rare-earth ions (RE 3+ ) are attractive candidates for applications in optical devices, 1,2 laser materials, 3 fluorescent labels, 4 and sensors. 5 However, dilution of vanadate groups with arsenate groups may favourably affect the thermal stability of luminescence.…”

“…YVO 4 and YAsO 4 belong to zircon-type ternary oxides, characterized as having a tetragonal crystal structure in the I4 1 /amd space group. 13,14 These two compounds are isostructural with differing unit cell sizes.…”

Novel YOF-Based Theranostic Agents with a Cascade Effect for NIR-II Fluorescence Imaging and Synergistic Starvation/Photodynamic Therapy of Orthotopic Gliomas

“…Therefore, the early diagnosis of malignant gliomas is particularly significant. Presently commonly used imaging methods for glioblastoma diagnosis mainly include positron emission tomography (PET), magnetic resonance imaging (MRI), single-photon-emission computed tomography (SPECT), and near-infrared (NIR) fluorescence imaging. , In recent years, NIR fluorescence imaging, especially in the second biological window (NIR-II FL), has been given much more consideration owing to its strengths of high sensitivity and spatiotemporal resolution, deep penetration, noninvasiveness, and low background noise. − Many kinds of probes have been explored as candidates for NIR-II FL in vivo until now, such as organic molecules, quantum dots, rare-earth fluorescent nanoparticles, and single-walled carbon nanotubes. − Among them, the rare-earth fluorescent nanoparticles are particularly fascinating owing to the exclusive optical properties, including large Stokes, narrow full width at half-maximum, and tunable excitation and emission, as well as good photostability. − Lanthanide oxyfluorides (LnOF, Ln = Y) nanocrystals with the characters of both fluorides and oxides (i.e., low phonon energy, good optical transparency, and chemical stability) exhibit good potential to act as promising probe for NIR-II FL. − Moreover, Nd 3+ ions with relatively large cross sections could serve as good sensitizer for efficient NIR-II emission excited by 808 nm laser through a self-sensitization process. , Therefore, the Nd 3+ -doped YOF fluorescent nanoparticles would be promising candidates for NIR-II FL of orthotopic glioma in vivo.…”

“…13−15 Moreover, Nd 3+ ions with relatively large cross sections could serve as good sensitizer for efficient NIR-II emission excited by 808 nm laser through a selfsensitization process. 16,17 Therefore, the Nd 3+ -doped YOF fluorescent nanoparticles would be promising candidates for NIR-II FL of orthotopic glioma in vivo. The combination of surgery, chemotherapy and radiotherapy is the first-line treatment strategy for glioma therapy in clinic, but the treatment effect is unsatisfactory because it is difficult for surgery to completely eliminate the glioma and most drugs cannot be efficiently accumulated in tumor owing to the existence of the blood−brain barrier (BBB).…”