3Gd(PO 4) 2: Tm 3+-Dy 3+ for light-emitting diodes and field emission displays]]>

摘要

AbstractSpectroscopic properties of K3Gd(PO4)2: Tm3+-Dy3+under ultraviolet (UV) light and low-voltage electron beam excitations were investigated. Upon direct excitation Tm3+from its6F6level to1D2level, the decrease of emission intensity and lifetime of Tm3+ 1D2-3F4emission with increasing concentration of Dy3+in K3Gd(PO4)2: Dy3+, Tm3+confirmed the occurrence of energy transfer from Tm3+to Dy3+. Besides, K3Gd(PO4)2: Dy3+, Tm3+could be efficiently excited by 358?nm UV light and its emission color could be tuned from blue to yellow by codoping Tm3+. When 1% Tm3+and 8% Dy3+were codoped in the K3Gd(PO4)2, intensive white emitting light with CIE of (0.338, 0.347) was achieved upon 358?nm excitation. The cathodoluminescence spectra of K3Gd(PO4): Tm3+, Dy3+phosphors as a function of accelerating voltage and filament current were also measured. Under low-voltage electron-beam excitation, K3Gd(PO4)2: Tm3+, Dy3+phosphors exhibit excellent tunable emitting property. All of the above results reveal that the as-prepared K3Gd(PO4)2: Tm3+, Dy3+phosphors have potential applications in white LEDs and FEDs.Graphical abstractDisplay OmittedHighlights?Crystal structure of K3Gd(PO4)2: Dy3+, Tm3+were investigated.?Photoluminescence and Cathodoluminescence properties were discussed.?