Fluorescence regulation derived from Eu³⁺ in miscible-order fluoride-phosphate blocky phosphor

Abstract

Miscible-order fluoride-phosphate blocky phosphor (FBP), composed with ordered-phase of NaYF4 crystals and unordered phase of tin-fluorophosphate glass, is prepared by a two-step process and luminescent properties of FBPs embedded with different particle sizes of NaYF4 crystals are presented. High-frequency fluorescence from higher metastable 5D J (J = 1, 2 and 3) energy levels are effectively released in Eu3+ doped fluoride crystals. Taking the blue emission of Sn2+ as the framework, multi-peak emissions from metastable energy levels are controlled to adjust the color coordinates of the FBP to the white-light region, which the color rendering index (CRI) reaches 89. Tunable color FBP with high CRI retains splendid luminescence property of fluoride, providing a potential candidate for the development of white LED.

Photodynamic Therapy and Multi-Modality Imaging of Up-Conversion Nanomaterial Doped with AuNPs

“…However, in our research, their photothermal stability seems not to be very good [18]. Unfortunately, when these materials meet the biological requirements, they will inevitably reduce their luminous intensity, so that imaging cannot be performed to obtain a clear image [19,20]. Considering the high desire to develop UCNPs nanomaterials with highly effective imaging capability as well as high biocompatibility to prevent apoptosis or biological organ failure, UCNPs doped with Au nanoparticles (AuNPs) are an ideal candidate because they are easy to fabricate, have enhanced luminescence, and are easy to surface modify [7,21].…”

Photothermal Effect and Multi-Modality Imaging of Up-Conversion Nanomaterial Doped with Gold Nanoparticles

“…However, in our research, their photothermal stability seems to be not very good [18]. Unfortunately, when these materials meet the biological requirements, they will inevitably reduce their luminous intensity, so that imaging cannot be performed to obtain a clear image [19,20]. Considering the high desire to develop UCNPs nanomaterials with highly effective imaging capability as well as high biocompatibility to prevent apoptosis or biological organ failure, UCNPs doped with gold nanoparticles are an ideal candidate because they are easy to fabricate, have enhanced luminescence, and are easy to surface modify [21,22].…”

Synthesis of Rare-Earth Nanomaterials Ag-Doped NaYF4:Yb3+/Er3+@NaYF4:Nd3+@NaGdF4 for In Vivo Imaging

“…Although these operations can reduce the biological toxicity and meet the basic requirements for use in biological cells or animals, there is no doubt that these changes will reduce the luminous intensity of the upconverted luminescent materials [ 15 , 16 , 17 ]. If such a material is used as a contrast agent for in vivo imaging, the image will be unclear, the tumor cannot be observed, and further diagnosis and treatment will be difficult [ 18 , 19 , 20 ]. Unfortunately, when these materials meet the biological requirements, their luminous intensity will inevitably be reduced, so that imaging cannot be performed to obtain a clear image [ 21 , 22 ].…”