title: Pr3+/Yb3+ co-doped beta-phase NaYF4 microprisms: controlled synthesis and upconversion luminescence.
abstract: Pr3+/Yb3+ co-doped hexagonal NaYF4(beta-NaYF4) microprisms were synthesized by the hydrothermal method, and ethylenediaminetetraacetic acid (EDTA) was introduced to control the size of the microcrystal samples. Bright upconverted fluorescence emission was observed when the samples were excited with an infrared (IR) laser at 976.4 nm. The emission was found to originate from the transitions of 3P0-3F2, 3P0-3H6 or 1G4-3H4, 3P1-3H6, 3P0-3H5, 3P1-3H5, and 3P0-3H4 of Pr3+ ions. Possible mechanisms for upconversion fluorescence and concentration dependence as well as the crystal structure and its formation of NaYF4:Yb3+/Pr3+ microprisms were explored and discussed based on the experimental observations.
authors.forename: Wei
authors.initials: W
authors.lastname: Gao
authors.forename: Hairong
authors.initials: H
authors.lastname: Zheng
authors.forename: Dangli
authors.initials: D
authors.lastname: Gao
authors.forename: Enjie
authors.initials: E
authors.lastname: He
authors.forename: Jiao
authors.initials: J
authors.lastname: Li
authors.forename: Yinxun
authors.initials: Y
authors.lastname: Tu
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005459:Fluorides / Q000737:chemistry*; D008163:Luminescent Measurements / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation*; D044367:Phase Transition; D011221:Praseodymium / Q000737:chemistry; D012031:Refractometry / Q000295:instrumentation*; D015018:Ytterbium / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry*
chemical_list: C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D015018:Ytterbium; D011221:Praseodymium; D005459:Fluorides