Facile synthesis of the phosphors of zinc oxide nanoparticles embedded in melamine resin for white light-emitting diodes

In this work, sol-gel method is employed to prepare ZnO nanoparticles with different surface defect states. Simultaneously, the prepolymer solution of melamine resin (MF) is also pre-synthesized. Then the as-prepared ZnO nanoparticles are mixed with prepolymer solution of melamine resin, resulting in the multi-colored solid-state photoluminescence phosphors (ZnO NPs@MF) after heat curing and grinding. The enhanced fluorescence emission is observed for ZnO NPs@MF, which may be due to the local field effect and reduction of non-radiative transitions brought by the dispersion and coating of MF resin. In addition, we have applied blue ZnO NPs@MF phosphors to the white light emitting diodes (LED) device, which preliminarily confirms the possibility of using our synthesized fluorescent powder in the indoor light source.