| 摘要 |
A fluorescent material with formula(YxMyCez)Al5O12, where x+y=3, x, y<>0, 0<z<0.5, M is selected from the group consisting of Tb, Lu, and Yb. The fluorescent material has a host (YxMy)Al5O12 and an activator: Ce. By changing the composition of metals in the host, the crystal field thereof can be modulated, thereby altering the interaction force between the activator and the other components, and changing the wavelength of emitted colors. The present invention provides a white light-emitting device comprising a light emitting diode and above-mentioned fluorescent powder. The LED emits purple-blue or blue light having a domination wavelength AD range from 430 nm to 500 nm. The fluorescent powder is excited by the purple-blue or blue light emitted from the LED to generate green-yellow light to orange-yellow light having a wavelength range from 560 nm to 590 nm and mixed with the light of LED to form white light.
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