title: One-Step Hydrothermal Synthesis of Butanetetracarboxylic Acid-Coated NaYF₄:Yb³⁺, Er³⁺ Upconversion Phosphors with Enhancement Upconversion Luminescence.
abstract: Butanetetracarboxylic acid (BTCA)/NaYF₄:Yb³⁺, Er³⁺ upconversion phosphors have been successfully synthesized by a one-step hydrothermal method. The SEM and XRD results show the as-prepared phosphors exhibit main hexagonal lattice structures and uniform morphologies. FT-IR spectra confirm that the surface of as-prepared phosphors is inherently modified with the carboxyl groups. Under the excitation of 980 nm, it has been observed that BTCA/NaYF₄:Yb³⁺, Er³⁺ upconversion phosphors have a higher upconversion luminescence efficiency than that coated with citrate, ethylenediamine tetraacetic acid (EDTA), or polyacrylic acid (PAA). These results indicate that the BTCA/NaYF₄:Yb³⁺, Er³⁺ phosphors may have superior optical properties, and thus have great potential for biological applications.
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang
authors.forename: Lanlan
authors.initials: L
authors.lastname: Mao
authors.forename: Zhuoxuan
authors.initials: Z
authors.lastname: Lu
authors.forename: Yan
authors.initials: Y
authors.lastname: Deng
authors.forename: Nongyue
authors.initials: N
authors.lastname: He
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D005459:Fluorides / Q000138:chemical synthesis / Q000737:chemistry; D049449:Luminescence; D012964:Sodium / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; C065777:1,1,4,4-butanetetracarboxylic acid; D015019:Yttrium; D004871:Erbium; D012964:Sodium; D015018:Ytterbium; D005459:Fluorides