Quantitative image analysis method for detection of nitrite with cyanine dye-NaYF4:Yb,Tm@NaYF4 upconversion nanoparticles composite luminescent probe

Research Progress on Up-Conversion Fluorescence Probe for Detection of Perfluorooctanoic Acid in Water Treatment

“…The study found that adding activators and sensitizers to up-conversion materials could greatly improve the luminescence efficiency of UCNPs. The fluorescent probe prepared by UCNPs has better luminescence effect and stable chemical properties [ 75 , 76 ], and does not undergo photochemical changes resulting in photobleaching. Therefore, the up-conversion fluorescent probe is a new way to study.…”

“…UCNPs should be further functionalized to enhance practical performance when after hydrophilic modification. For example, it can be modified by amino group [ 76 ] or carboxyl group modification [ 127 ]. These ways can enhance the ability of detection.…”

Controllable structural and optical properties of NaYF4:Tm, Yb microparticles by Yb3+ doping for anti-counterfeiting

“…NaYF 4 :Tm, Yb upconversion microparticles (UCMPs) are constituted by NaYF 4 host and a pair of Tm and Yb ions, typically Yb 3+ ions acting as a sensitizer, and Tm 3+ ions playing the role of emitters. This material exhibits outstanding applications such as photodetectors in NIR region, 10 photocatalyst, [11][12][13] biosensors, [14][15][16] and anticounterfeit printing. 3,17 In addition, surface modication with various ligands has been used to improve the dispersibility and colloidal stability of NaYF 4 UCMPs and the conjugation of UCMPs with biomolecules, polymers, etc.…”