Study on （Y, Gd）3（Al, Ga）5O12：Ce^3＋ Phosphor
摘要
(Y1-a, Gda)3-x(Al1-b, Gab)5O12∶Ce3+x was synthesized by high-temperature solid state reaction in reducing atmosphere based on high purity raw materials. The influences of Y3+, Gd3+, Al3+, Ga3+ and activator-Ce3+ on the performance of the phosphor were investigated. Ce3+ is the luminescent center and activates the phosphor after it replaces Y partially. When x is less than 0.12, the volume of the crystal and the emission intensity of the phosphor increase with the quantity of Ce3+. When CeO2 is added too much, the phase CeAlO3 will appear. The excitation and emission peaks of the phosphor will shift to longer wavelength when the amount of Gd3+ increases. The wavelength of the emission peak can shift about 20 nm when a equals 0.45. In opposite, the excitation and emission peaks will shift to shorter wavelength, when part of Al3+ is replaced by Ga3+. The wavelength of the emission peak can shift about 20 nm when b equals 0.55. Through the replacemeat of Y3+ or Al3+ by Gd3+ or Ga3+, the emission peak of the phosphor can be adjusted from 520 to 560 nm. In this way, the phosphor is more suitable for different chips.