The phosphor layer with contrdlable thickness can be obtained by preparing white LED based on slurry method.This structure possesses many physical characteristics and can improve the uniformity of the white LED.Because of the heat emission from the chip and the momentary temperature from the reflow sold,the polyvinyl alcohol(PVA) will become brown in the high temperature condition,which affects the white LED luminous stabilization.Adopting plasma stripping can not only effectively remove the lig...