Synthesis and characterization of efficient near-infrared upconversion Yb and Tm codoped NaYF4 nanocrystal reporter

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

“…A number of different techniques have been developed to synthesize rare-earth-based upconverted nanocrystals, such as the sol-emulsion-gel method, [3,26,27,53] thermal decomposition method, [35] coprecipitation method, [54,55] and hydrothermal method. [56,57] Dr. Arik Kar (born 1984) Member of Nanoscale and the Journal of Physical Chemistry and others.…”

“…Yi et al [54] synthesized NaYF 4 :Yb,Er upconverted nanocrystals by using the coprecipitation method with the aid of ethylenediamine tetraacetic acid (EDTA). Wei et al [55] reported a similar method to synthesize NaYF 4 :Yb,Tm upconverted nanocrystals in the presence of EDTA. Haase, [28] Güdel, [22] Chen, [54] and Li [63] reported the synthesis of NaYF 4 :Yb/ Er(Tm), LuPO 4 :Yb/Tm, and YbPO 4 :Er nanocrystals by using the coprecipitation method coupled with heat treatment for enhanced UC emission.…”

Luminescent Sensing of Oxygen Using a Quenchable Probe and Upconverting Nanoparticles

“…[20] The cubic form was converted (to a large extent) into the hexagonal form by annealing at 400 8C as described in the literature. [21] This temperature was chosen because annealing at higher temperatures, albeit yielding almost purely hexagonal phase nanocrystals, results in a highly aggregated material. [21] The material obtained by this method is well-suited for the purpose of sensing.…”

“…[21] This temperature was chosen because annealing at higher temperatures, albeit yielding almost purely hexagonal phase nanocrystals, results in a highly aggregated material. [21] The material obtained by this method is well-suited for the purpose of sensing. Experimental details and a TEM image are given in the Supporting Information.…”

Preparation and luminescence properties of monodisperse silica/aminosilane-coated Y2O3:Yb,Ho upconversion nanoparticles

“…Due to potential applications in solid state lasers, three dimensional displays and anti-forgery, considerable effort has been devoted to the study of upconversion luminescence since the concept was first formulated by Auzel in the mid-1960s [1][2][3][4][5]. Recently, fluorescent bioprobes based on upconversion nanocrystals have attracted much attention because they not only overcome the inherent disadvantages of conventional fluorescence markers such as photobleaching, optical damage and auto-fluorescence, but also allow in vivo imaging of deep tissues [6][7][8][9][10][11].…”