This paper describes the photoluminescence (PL) properties of ZnO nanoparticles with BN capsules (ZnO/BN core/shell structure). PL enhancement of over one thousand of ZnO/BN to ZnO nanoparticles was observed, which has been attributed to the dielectric environment effects of the capsule on the interfacial structures and defect amounts of ZnO quantum dots (QDs),