Considering the growing importance of energy saving and environmental friendliness

solid-state lighting is emerging as a highly competent field and a possible alternative to existing lighting technologies. Recently

a blue LED combining with a yellow emitting YAG ∶ Ce phosphor was used mostly to make white-lighting LED

however

as the high synthesis temperature of YAG phosphor

poor color quality due to the serious scarcity of red light

a novel phosphor is rather needed. An Eu-activated silicate-based phosphor for WLED was prepared by solid-state reaction (SSR) under reductive atmosphere. The morphology of the phosphor powder was observed by means of scanning electronic microscope. The excitation and emission spectra were measured by F-4500 spectrometer using a Xe-lamp as an excitation source. And the encapsulation cha-racteristics of silicate-based phosphor were comparatively studied with that of YAG phosphor. The results showed that the as-synthesized silicate-based phosphor has homogenous particle size of about 15 μm and broad excitation band. When the as-synthesized phosphor and YAG were encapsulated to blue LED chips with diffe-rent emission wavelength

the chromaticity coordinate

color-rendering index and luminous efficiency fluctuated a little; especially the luminous efficiency only fluctuated about 5% in comparison with YAG. However

when YAG phosphor was encapsulated to blue LED chip with emission wavelength longer than 462.5 nm

its luminous efficiency decrease remarkably due to its narrow excitation spectra. The comparison results of relative emission spectra of silicate and YAG LED indicated silicate phosphor is more suitable for the encapsulation of warm white LED than YAG phosphor. And the results of particle size showed silicate phosphor have potential application for high power LED. The aging performance of silicate phosphor is better than that of YAG phosphor. In conclusion

the as-synthesized silicate-based phosphor is a novel phosphor for white LED

having a broad excitation band and excellent chemistry performance

especially well matched with blue-light-emitting LED chips with different emission wavelengths.