Manipulating energy transfer to achieve zero-thermal quenching luminescence in a white-emitting borotellurate phosphor

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+ 3 + _Dy 3 + energy transfer (ET) method is manipulated to simultaneously achieve white-emitting and zero-thermal quenching luminescence in Na2Y2TeB2O10 2 Y 2 TeB 2 O 10 (NYTB), which is constructed via the co-substitution of Tm3+/Dy3+ 3 + /Dy 3 + for Y3+. 3 + . The ET mechanism and efficiency are determined. The color coordinates (0.3545, 0.3334) of the representative NYTB:0.07Tm3+,0.05Dy3+ 3 + ,0.05Dy 3 + 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.