| 摘要 |
A yellow phosphor material has a host with a formula (Tb<SUB>x</SUB>M<SUB>y</SUB>Ce<SUB>z</SUB>)Al<SUB>5</SUB>O<SUB>12</SUB>, wherein x+y+z=3 , 3>x>0 and y<>0 and a Ce activator. M is selected from the group consisting of Sc, Y, Dy, Ho, Er, Tm, Yb, and Lu. By changing the diameter of metal ions, the crystal field thereof may be modulated to thereby alter the energy level of the excited state to which the activator is transferred upon irradiation by a specific wavelength of light. The phosphor can be used with a blue LED to form a white light source.
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