研究目的
The present investigation focused on the sequence of Eu3 + activated red-emitting vanadate phosphor for the high performance white LEDs.
研究成果
In conclusion, a series of Eu3 + activated Ba2YV3O11 red phosphors were synthesized by traditional solid-state route. The powder XRD patterns confirmed that the synthesized phosphors were crystallized in the monoclinic phase with space group P21/C. The Ba2YV3O11 host lattice shows the blue emission due to the 3T1!1A1 and 3T2!1A1 transitions and Eu3 + activated red phosphors exhibited intense red emission at 618 nm (5D0!7F2). The host emission is absence in the Eu3 + activated red phosphors, which suggests the presence of complete energy transfer from [VO4]3(cid:0) group to Eu3 + ion. The optimized composition of present phosphor exhibits reasonably good thermal stability and IQE. Finally, the red and white LEDs were fabricated, the electroluminescence spectrum of the red LED shows the intense red emission than that of near UV LED. The fabricated white LED shows white light with high CRI (89) and low CCT (4693 K) values. These excellent results expose that the presently studied orange-red phosphors can be a potential red-emitting contestant in the white LEDs field.
研究不足
The thermal stability of the Ba2Y0.4Eu0.6V3O11 red phosphor retains the ～ 60 % emission intensity at 423 K, and the internal quantum efficiency (IQE) was found to be 30 %.
