title: Luminescent properties of ZnS:Mn2+/ZnS core/shell nanocrystals.
abstract: High-quality ZnS:Mn2+/ZnS core/shell nanocrystals (NCs) with a core crystal diameter of 6.1 nm and 1.15 nm thick shells were synthesized via a high-boiling solvent process. The energy levels of the conduction band and valance band are estimated to be -3.2 eV and -6.8 eV by cyclic voltammetry and ultraviolet-visible (UV-vis) absorption spectra. The ZnS:Mn2+/ZnS NC emission peak is primarily located at 580 nm under 310 nm light excitation, originating from the charge transition from 4T1 to 6A1 within the 3d5 configuration of the Mn2+ ion. Based on ZnS:Mn2+/ZnS NCs as the active layer electroluminescent devices, the emission peak mainly locates at 460 nm with one shoulder emission peaking at 580 nm. The photoluminescence and electroluminescence properties of ZnS:Mn2+/ZnS NCs are investigated in the view of charge carrier injection and energy level alignment.
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, People's Republic of China.
authors.forename: Fujun
authors.initials: F
authors.lastname: Zhang
authors.forename: Zewei
authors.initials: Z
authors.lastname: Quan
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Xu
authors.forename: Zuliang
authors.initials: Z
authors.lastname: Zhuo
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xu
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Lin