Preparation and upconversion luminescence of Y2O3:Yb3+, Ho3+ nanocrystalline powders coated with SiO2

Synthesis, morphology, photoluminescence and photocatalytic properties of yolk–shell Au@Y2O3:Eu3+ sub-microspheres

“…Yttrium oxide (Y 2 O 3 ) is known as an excellent host lattice for both down-conversion and up-conversion luminescence of various rare earth ions because of its favorable physical properties [21,[31][32][33][34]. In our case, a stoichiometric amount of europium ions (Eu 3+ ) were doped into the Y 2 O 3 host lattice to investigate the Photoluminescence properties.…”

Synthesis and upconversion luminescence of monodispersed, submicron-sized Er3+:Y2O3 spherical phosphors

“…In particular, Er 3+ ion has been widely doped because Er 3+ ion has energy levels that closely match the wavelength of commercial available InGaAs laser diode (LD) [7,8]. Among the inorganic host for upconversion luminescent materials, Y 2 O 3 is a promising candidate owing to its physical and chemical stability and its relatively low phonon energy [9][10][11][12]. Therefore, Y 2 O 3 materials doped with Er 3+ ions or Er 3+ sensitized with Yb 3+ ions have particularly attracted considerable interests in terms of high chemical durability and thermal stability.…”

“…Phosphor particles of a uniform and small size are thus beneficial to a highly efficient and uniform luminescence [18]. A number of different techniques have been developed to synthesize luminescent powders, such as sol-gel [19,20], chemical vapor synthesis [21], combustion synthesis [22], and coprecipitation [5,11,12,15]. Among these methods, coprecipitation is the most popular and simple method for precipitating hydroxide precursor in an aqueous medium.…”

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

“…Yttria-based upconversion nanocrystals (YUNs) are well known as an excellent candidates for upconversion fluorescent bioprobes because of their favorable chemical and thermal stability, nontoxicity and high emissive intensity [12][13][14][15][16][17][18][19][20][21]. However, unmodified YUNs tend to agglomerate in water and lack surface groups capable of coupling biomolecules, which limits their application in bioassays.…”

“…However, unmodified YUNs tend to agglomerate in water and lack surface groups capable of coupling biomolecules, which limits their application in bioassays. Various methods have been developed to solve these problems *Corresponding author (email: whcao@online.ln.cn) [17][18][19][20][21], among which surface coating the YUNs with silica and/or siloxane layers is the simplest and effective method. To date, the silica or silica/siloxane layers coated on the aggregated YUNs are relatively thick (more than 20 nm), and the particles coated are larger than 100 nm.…”