Yellow light emitting Ce³⁺-activated silicate phosphor with new composition, manufacturing method thereof and white LEDs including phosphor

摘要

The present invention relates to a phosphor and a white LED, more particularly, to a method for fabricating a yellow emitting Ce³⁺-activated silicate phosphor with a new composition represented as (Sr_1-y-zM_yN_z)_3-xSiO₅:Ce³⁺_x, (0x≦0.3, M includes at least one selected from alkaline earth metals on the periodic table, 0≦y≦1, N is at least one selected from alkali metals on the periodic table and 0≦z≦0.3) and a preparation method thereof and an LED using the same. The phosphor according to the present invention shows a broad band emission when it is excited by the existing InGaN-based blue LED and GaN-based ultraviolet LED with long wavelength. The LED using the phosphor according to the present invention has a broad emission with a wide spectral range and good color purity and very high light emitting efficiency when is applied to a LED and a backlight source of a liquid crystal display.