title: An effective oxidation approach for luminescence enhancement in CdS quantum dots by H2O2.
abstract: The effects of surface passivation on the photoluminescence (PL) properties of CdS nanoparticles oxidized by straightforward H2O2 injection were examined. Compared to pristine cadmium sulfide nanocrystals (quantum efficiency ≅ 0.1%), the surface-passivated CdS nanoparticles showed significantly enhanced luminescence properties (quantum efficiency ≅ 20%). The surface passivation by H2O2 injection was characterized using X-ray photoelectron spectroscopy, X-ray diffraction, and time-resolved PL. The photoluminescence enhancement is due to the two-order increase in the radiative recombination rate by the sulfate passivation layer.
authors.affiliation: WCU Hybrid Materials Program, Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 151-744, Korea. byungwoo@snu.ac.kr.
authors.forename: Woojin
authors.initials: W
authors.lastname: Lee
authors.forename: Hoechang
authors.initials: H
authors.lastname: Kim
authors.forename: Dae-Ryong
authors.initials: DR
authors.lastname: Jung
authors.forename: Jongmin
authors.initials: J
authors.lastname: Kim
authors.forename: Changwoo
authors.initials: C
authors.lastname: Nahm
authors.forename: Junhee
authors.initials: J
authors.lastname: Lee
authors.forename: Suji
authors.initials: S
authors.lastname: Kang
authors.forename: Byungho
authors.initials: B
authors.lastname: Lee
authors.forename: Byungwoo
authors.initials: B
authors.lastname: Park