Al2O3-Ce:Tb3Al5O12 composite ceramic phosphors for high efficiency warm white light illumination

Al2O3-Ce:Tb3Al5O12(TAG) composite ceramics have been synthesized by solid-state vacuum sintering for the application of high efficiency warm white light illumination. The microstructures and fluorescent properties were investigated systematically. Through the introduction of Al2O3 particles, the luminous efficiency (LE) of Ce:TAG ceramics based LED can be largely promoted by similar to 40%. When the molar ratio of Al2O3/Ce:TAG is 0.4, the photoelectric properties can be modified by the scattering from both Al2O3 and residual pores. Moreover, a high color-rendering index(CRI) of 63 and a low color correlated temperature(CCT) of 3580 K can also be obtained at the same time. The results indicate that Al2O3-Ce:TAG composite ceramics are very promising candidates for the application of high-quality white-lighting.