| 简介 |
PURPOSE : Provided are a terbium borate-based yellow fluorescent substance which is excellent in color rendition and is reduced in emission luminance even in the case of the use for a long time, its preparation method, a white semiconductor light emitting device employing the fluorescent substance, and a liquid crystal device employing the LED as a backlight.
CONSTITUTION : The terbium borate-based yellow fluorescent substance is represented by (Tb_(1-x-y-z) RE_x A_y)3 D_a B_b O12 : Ce_z, wherein RE is a rare earth element and is at least one element selected from the group consisting of Y, Lu, Sc, La, Gd, Sm, Pr, Nd, Eu, Dy, Ho, Er, Tm and Yb; A is at least one element selected from the group consisting of Li, Na, K, Rb, Cs and Fr; D is at least one element selected from the group consisting of Al, In and Ga; 0<=x<0.5; 0<=y<0.5; 0
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