Patent ID: 7059927

Claim:
A method for manufacturing a white light-emitting diode light source capable of producing a color-variable light with respect to time, comprising: providing an ultra-violet light light-emitting diode serving as an excitation source; providing three first phosphors capable of emitting colored lights of red, green and blue color, respectively; wherein at least one of said three first phosphors has a phosphorescent property; exciting said three first phosphors by provision of the excitation source for producing a white light; and stopping the provision of the excitation source, wherein said at least one colored light of said at least one first phosphor with the phosphorescent property is sustained for a long time and has a color which varies with respect to time; wherein said at least one of said three first phosphors is selected from the group consisting of Sr 4 Al 14 O 25 :Eu.M; Y 2 O 2 S:Eu,M and ZnS:Cu,M, wherein M is a transition metal or a rare earth element.