the present disclosure relates to a method for preparing a silicate phosphor and the silicate phosphor . the method includes a hydrothermal treatment step of obtaining a layered silicate substituted with a rare - earth metal by hydrothermally treating an aqueous solution as a reaction solution , the solution containing rare - earth metal ions , naoh and silica , and a calcinating step of forming a crystalline silicate by calcinating the layered silicate substituted with the rare - earth metal . according to the method for preparing the silicate phosphor , the silicate phosphors , which can be used as phosphors for leds in the aspects of high covalent character , high luminescent intensity and stability at high temperature , may be prepared by a simplified , economic process . also , the silicate phosphors may selectively emit red , green or blue light by virtue of the substitution of a silicon position with rare - earth metals of various types .