Na(Y1.5Na0.5)F-6:RE3+(Dy3+,Tb3+,Eu3+,Tm3+,Ho3+):Controllable morphology, multicolor light and thermal properties

摘要

A series of emission-tunable Na(Y1.5Na0.5)F-6:RE3+(Dy3+, Tb3+, Eu3+, Tm3+, Ho3+) phosphors were firstly synthesized by the glycine assisted one-step hydrothermal process. The structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results revealed that the samples contain YF3 and Na(Y1.5Na0.5)F-6 phases, and the size and shape of the products could be tuned just by adjusting the pH values of the initial reaction solutions or by adjusting the RE3+/NaF ratio or RE3+/NaBF4 ratio. The product morphologies include spindle-like microstructures, six prismatic, irregular microrods, micron hexagonal prisms and nano-spheres, micron elliptical disc, flower-like microstructures, spindle-like structures and irregular bulk. Furthermore, the photoluminescence properties of Na(Y1.5Na0.5)F-6:RE3+(Dy3+, Tb3+, Eu3+, Tm3+, Ho3+) were investigated in detail. Additionally, the emission color of Na(Y1.5Na0.5)F-6:RE3+(Dy3+, Tb3+,Eu3+, Tm3+, Ho3+) can be turned by adjusting the amount and kind of RE3+ ions. Importantly, the temperature-dependent photoluminescence of asprepared phosphors was evaluated in detail. All these properties indicate that the developed phosphors may potentially be used as single-component multicolor-emitting phosphors. (C) 2020 Elsevier B.V. All rights reserved.