Abstract
A collection of GdF3 core-shell structured (CSS) phosphors were synthesized by hydrothermal method. The as-prepared (AP) phosphors were coated with SiO2 layers to avoid aggregation and sintering during thermal annealing at 800 °C, after which the SiO2 layers were etched off and the annealed phosphors became highly dispersible. The annealed CSS phosphor aGdF3:Eu3+@GdF3:Ce3+,Dy3+ shows excellent multicolor luminescence performance with the aid of dual-channel excitation and energy migration (EM) procedure of Gd3+ ions. By inserting pyromellitic acid (PMA) organic ligands into the interfaces between annealed core and AP shell layer regions, the so-called antenna effect of organic ligands of PMA forms a new excitation channel, which makes the CSS phosphor aGdF3:Eu3+@PMA@GdF3:Ce3+,Dy3+ exhibit significantly enhanced multicolor luminescence via multi-channel excitation and EM process. The prepared CSS phosphors in this work are excellent candidates for applications in solid-state lighting.
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