title: Efficient infrared luminescence of Er2S3/ZnS core/shell quantum dots and IR QDs-lED.
abstract: We have synthesized Er2S3/ZnS core/shell QDs by employing ErSt3, ZnSt2, and sulfur as precursors via a hot solution phase chemistry using a nucleation-doping strategy. X-ray diffraction (XRD), transmission electron microscope (TEM) and photoluminescence (PL) spectra were used to characterize the structure, morphology and luminescence properties of Er2S3/ZnS core/shell QDs. Moreover, the influence of overcoating temperatures on the infrared luminescence properties of QDs was investigated. PL spectra show that the emission intensity from the 4I13/2 --> 4I15/2 transition of Er3+ strongly increases with increasing overcoating temperatures, which was interpreted by the enhancing diffusion of Er3+ ions. IR-LEDs were fabricated combining commercial red GaAs LEDs with Er2S3/ZnS QDs, and luminescence properties of the IR-LED have been investigated.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Ji
authors.forename: Gaofeng
authors.initials: G
authors.lastname: Zhang
authors.forename: Lan
authors.initials: L
authors.lastname: Li
mesh_terms: D003460:Crystallization / Q000379:methods; D004871:Erbium / Q000737:chemistry*; D007259:Infrared Rays; D008029:Lighting / Q000295:instrumentation*; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D018036:Selenium Compounds; D017967:Zinc Compounds; D004871:Erbium; C044696:zinc selenide