Title
Tartrate promoted hydrothermal growth of highly [001] oriented (La0.95 − xBixEu0.05)PO4 (x = 0–0.01) nanowires with enhanced photoluminescence
Author
Zhihao Wang, Ji-Guang Li, Qi Zhu, Byung-Nam Kim, Xudong Sun
Year
2017
Journal
Materials & Design
Abstract
Monoclinic (La0.95 − xBixEu0.05)PO4 nanowires with lengths of ~ 1.5 μm and diameters of ~ 20–50 nm (aspect ratio up to the high value ~ 75) have been synthesized via hydrothermal crystallization in the presence of sodium tartrate (Tar2 −). Detailed characterizations of the materials were achieved by the combined techniques of XRD, FE-SEM, TEM, FT-IR, and optical spectroscopies, and the formation mechanism of the nanowires was expatiated. It was found that Tar2 − as a shape modifier can cap the growth of {012} facets and thus led to nanowires of high [001] orientation. The effects of experimental parameters such as Tar2 −/M3 + (M = total cation) and PO43 −/M3 + molar ratios, hydrothermal temperature and reaction time on phase and morphology evolution of the nanowires were unveiled. The effects of shape anisotropy, calcination and Bi3 +doping on the photoluminescence properties of the (La0.95 − xBixEu0.05)PO4 nanowire phosphors were also investigated in detail, including excitation, emission, fluorescence lifetime, and CIE chromaticity coordinates. The optimal Bi3 + content was determined to be ~ 0.7 at%.
Instrument
FP-6500
Keywords
Fluorescence, Photoluminescence, Nanostructures, Lifetime, Materials