Abstract
Energy transfer-induced white-emitting phosphor materials acquired much attention in white light-emitting diode (w-LED) domain. Nevertheless, how to obtain extremely high thermostable luminescence is one of the troubles, which is urgently solved. Diverse strategies were proposed to improve thermal quenching resistance of w-LED phosphors. Herein, a Tm3+−Dy3+ energy transfer (ET) method is manipulated to simultaneously achieve white-emitting and zero-thermal quenching luminescence in Na2Y2TeB2O10 (NYTB), which is constructed via the co-substitution of Tm3+/Dy3+ for Y3+. The ET mechanism and efficiency are determined. The color coordinates (0.3545, 0.3334) of the representative NYTB:0.07Tm3+,0.05Dy3+ phosphor closely resemble (0.33, 0.33) for the standard white light. It is employed to fabricate a w-LED device with low CCT. This work offers an in-depth insight of ET strategy for both obtaining white-emitting and developing extremely high thermostable luminescence.
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