| 摘要 |
PURPOSE: Provided are a fluorescent powder composition for modulating light color by producing red shift in the primary wavelength, thereby adjusting magnitude of crystal lattice field of the host of a fluorescent material, and a method for fabricating high brightness white light emitting diode by using the composition. CONSTITUTION: The composition of a fluorescent material is characterized in that the fluorescent material has a 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, wherein the (YxMy)Al5O12 is a host thereof, and Ce is a activator thereof, and wherein by adjusting the metal component of the (YxMy)Al5O12 host of the fluorescent material, a crystal field thereof can be modulated, thereby changing wavelength of light emitted from the fluorescent material, wherein the fluorescent material is synthesized by raw powders including oxides, nitrates of metal compounds, organic metal compounds, or salts of metals, wherein the synthesis of the fluorescent material is done by using solid state sintering or chemical processes, and wherein the chemical processes comprises sol-gel method and co-precipitation. The white light emitting device comprises a fluorescent material having a formula (YxMyCez)Al5O12 in combination with a light emitting diode (LED) capable of emitting light having predetermined wavelength and brightness serving as an excitation light source, and after packaging the fluorescent material and the LED and applying current thereon, light generated by the fluorescent material and light generated by the LED are mixed to form white light. |
