Y3Al5O12:Ce0.05 phosphor coatings on a flexible substrate for use in white light-emitting diodes

The Y3Al5O12:Ce0.05 phosphor particles were coated on flexible indium tin oxide-coated polyethylene terephthalate by electrophoretic deposition to achieve a uniform and high packed coating. White light was obtained using the flexible YAG phosphor layer and a blue unpackaged GaN chip without direct coating onto a GaN chip. The chromaticity of the white light was x = 0.2994, y = 0.3272, which corresponded to good quality white light. As part of a study of the electrophoretic deposition of Y3Al5O12:Ce0.05 yellow phosphor, zeta potential was measured in isopropyl alcohol at various concentrations of electrolyte. The zeta potential of the phosphor was dependent on the concentration of salt such as Mg(NO3)2 in suspension.