Abstract
A novel white-light emitting single-phase phosphor La3Si6N11:Dy3+, exhibiting two emission peaks centering at 475 and 575 nm, was prepared via conventional solid-state reactions. The structure and morphology of La3Si6N11:Dy3+/Tb3+ were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The emission colors can be tuned from white to yellow-green through increasing the Tb3+ concentration in La3Si6N11:Dy3+,Tb3+. The mechanism of energy transfer (ET) from Dy3+ to Tb3+ is confirmed according to the excitation, emission spectra and decay lifetimes curve. The temperature-dependent luminescence measurements of La2.83Si6N11:0.1Dy3+,0.07Tb3+ were also performed, and a good thermal stability is shown, suggesting superior properties for the application as white light-emitting diodes (w-LEDs) phosphor.
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