title: Continuous white luminescence of ZnS:Pb2+ and core/shell ZnS:Pb2+/ZnS nanocrystals.
abstract: High-quality water-soluble ZnS:Pb2+ nanocrystals were synthesized via a simple chemical codepositing method. The as-synthesized ZnS:Pb2+ nanocrystals show high monodispersity and crystallinity with a narrow size distribution (3.2 +/- 0.4 nm). ZnS:Pb2+/ZnS core/shell structures were also obtained by coating a ZnS shell displaying significantly enhanced photoluminescence (PL) intensity and photostability. For the ZnS:Pb2+/ZnS samples the position of emission spectrum shows a red-shift of approximately 10 nm, which produces a fairly pure white emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.31, 0.33). These phenomena are explained by a model of multiple Pb2+ luminescent centers.
authors.affiliation: Institute of Material Physics, Tianjin University of Technology, Tianjin 300384, People's Republic of China.
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Zhang
authors.forename: Lan
authors.initials: L
authors.lastname: Li
authors.forename: Ting
authors.initials: T
authors.lastname: Ji
authors.forename: Dongqing
authors.initials: D
authors.lastname: Dong
authors.forename: Gaofeng
authors.initials: G
authors.lastname: Zhang
authors.forename: Kaixiang
authors.initials: K
authors.lastname: Li