In order to coat the high quality yellow phosphor layer on a GaN chip,a novel structure slurry method based on water soluble PVA is introduced.The phosphor emulsion consists of polyvinyl alcohol(PVA),silicone,phosphor,surfactants tetrahydrofuran and ammonium dichromate(ADC).Firstly,silicone is dispersed within the tetrahydrofuran,and then it is mixed with the surfactant and PVA,the eventually multiphase structure emulsion is gained.In the emulsion,PVA that is considered as the external phase encases silicon...