title: Synthesis of Novel Sea-Urchin-Like CdS and Their Optical Properties.
abstract: A novel morphology of CdS sea-urchin-like microstructures is synthesized by simple thermal evaporation process. Microstructures with average size of 20-50 μm are composed of single crystalline CdS nanobelts. The structural, compositional, morphological characterization of the product were examined by X-ray diffraction, energy dispersive X-ray spectroscopy, Raman spectroscopy, scanning electron microscope, transmission electron microscopy and selected area electron diffraction while optical properties are investigated by Photoluminescence spectroscopy and time-resolved Photoluminescence measurements. The tentative growth mechanism for the growth of sea-urchin-like CdS is proposed and described briefly. A strong green emission with a maximum around 517 nm was observed from the individual CdS microstructure at room temperature, which was attributed to band-edge emission of CdS. These Novel structures exhibit excellent lasing (stimulated emission) with low threshold (9.07 μJ cm(-2)) at room temperature. We analyze the physical mechanism of stimulated emission. These results are important in the design of green luminescence, low-threshold laser and display devices in the future.
authors.forename: Muhammad Arshad
authors.initials: MA
authors.lastname: Kamran
authors.forename: Ruibin
authors.initials: R
authors.lastname: Liu
authors.forename: Li-Jie
authors.initials: LJ
authors.lastname: Shi
authors.forename: Arfan
authors.initials: A
authors.lastname: Bukhtiar
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Bingsuo
authors.initials: B
authors.lastname: Zou
mesh_terms: D000818:Animals; D019187:Cadmium Compounds / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008954:Models, Biological; D012617:Sea Urchins; D012666:Semiconductors; D013050:Spectrometry, Fluorescence; D013440:Sulfides / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D019187:Cadmium Compounds; D049408:Luminescent Agents; D013440:Sulfides; C034939:cadmium sulfide