Fluorescence quenching mechanism for water-dispersible Nd3+:KYF4 nanoparticles synthesized by microwave-hydrothermal technique

Neodymium-doped nanoparticles for infrared fluorescence bioimaging: The role of the host

“…In order to increase the dispersibility of the resulting nanoparticles, the Emuksol-268 (NIOPIK) biocompatible poloxamer was added to the rareearth nitrates solution mixture before the gel precipitation. 38 The obtained gel was transferred into the 100 ml teflon autoclave and exposed to microwave-hydrothermal (MW-HT) treatment (200 C, 4 h) using Berghof Speedwave-4 laboratory device (2.45 GHz, 1 kW maximum output power). After the treatment, the sample was centrifuged, washed several times with deionized water, and air-dried at 100 C for 2 h. a-NaYF 4 :Nd 3þ NPs were synthesized via a thermal decomposition method as described in the literature.…”

“…This work constitutes a comparative study of the three Nd:NPs that have already been used for in vivo imaging purposes along with four other Nd 3þ doped systems (NaYF 4 :Nd 3þ , KYF 4 :Nd 3þ , GdVO 4 :Nd 3þ , and Y 3 Al 5 O 12 :Nd 3þ -hereafter Nd:YAG-) whose synthesis, basic characterization, and potential use as infrared biolabels have been reported and proposed. [37][38][39][40] The relevant role played by host in determining the fluorescent properties of Nd:NPs is discussed and, based on the comparative spectroscopic characterization, the ability of the different systems for in vivo imaging experiments will be discussed.…”

Extremely straightforward room temperature co-precipitation method to synthesize cubic KYF4:Yb/Er up-conversion nanoparticles in deionized water-ethanol solution

“…11,14,16,18,19 But the researches about KYF 4 up-conversion nanoparticles are scarce. 11,[20][21][22][23] Apart from concerning the kinds of different host materials, we cannot ignore the current cumbersome synthesis methods including hydrothermal/solvothermal method and thermal decomposition that need high reaction temperature and long reaction time. Although they were widely used, they have many disadvantages such as hazardous coordinating solvents, toxic organometallic reagents and stringent reaction condition which come with high costs, low yield, low repeatability and a risk of security.…”

Relation of Crystallinity and Fluorescent Properties of LaF3 :Nd3+ Nanoparticles Synthesized with Different Water-Based Techniques

“…We intentionally used a weak surfactant (Proxanol‐268) for HTMW synthesis to compensate higher concentration of reagents and obtain product with the same mean size of the particles as in the case of CO technique. Our previous experiments with HTMW synthesis showed that the presence or absence of this surfactant affects only dispersibility and particles size, but has no effect on their crystallinity . Having NPs of the same size is crucial for comparison of their optical properties, as, for example, the fluorescence spontaneous decay rate and the fluorescence quenching kinetics depend on the size of the NPs.…”

“…So, the kinetics can be a very sensitive probe for such kind of crystal lattice defects. For example, in the absence of OH − or in the case of their replacement by OD − the late exponential stage of the fluorescence kinetics when self‐quenching can be neglected is governed solely by the spontaneous photon emission of excited single‐site optical centers and the decay time is the radiative decay time τ R …”