28-06-2017 дата публикации
Номер: KR1020170073353A
Принадлежит:
An embodiment relates to a light emitting device and a lighting system including the same. According to an embodiment, provided is a phosphor comprising a phosphor composition of a M_4D_1_-_xO_yF: A_x structure containing a divalent metal (M), an element of an active agent (A), fluorine (F) and oxygen (O), wherein x satisfies 0.001 <= x <= 0.1, y satisfies 1 <= y <=5, M is at least one of Mg, Ca, Sr, Ba, and Zn, D is at least one of Si, Ge Sn, Ti, Zr, and Hf, F is fluorine, and A includes at least one of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb. The composition of the phosphor emits red light with a peak wavelength of 400 to 470 nm as an excitation wavelength, and the red light has a peak wavelength of 655 to 670 nm and a half width of 20 nm or less. According to the embodiment, a novel phosphor and a light emitting device having a combination thereof can be provided. The color reproducibility can be improved by using a red phosphor according to the embodiment. COPYRIGHT KIPO ...
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