Electroluminescent properties of chemically synthesized zinc sulfide nanocrystals doped with manganese

• Published in: Journal of materials science. Materials in electronics 2009, Vol.20 (Suppl 1), p.130-133
• Main Authors: Adachi, Daisuke, Hama, Takeshi, Toyama, Toshihiko, Okamoto, Hiroaki
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Devices; Electric fields; Electroluminescence; Electronics; Exact sciences and technology; Excitation; Glass substrates; Glasses (including metallic glasses); Luminance; Materials Science; Nanocrystals; Numerical control; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other luminescence and radiative recombination; Physics; Specific materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-007-9465-4

High-field electroluminescence (EL) of chemically synthesized ZnS:Mn nanocrystals with a crystallite size of 4 nm was investigated using a device consisting of glass substrate/indium–tin oxide/ZnS:Mn NC emission layer/Al. For electric fields over ca. 1 MV/cm, the current was turned on, and orange EL was observed. The maximum luminance was 0.45 cd/m 2 at a DC voltage of 42 V. The EL spectrum comprises a single peak with a peak wavelength of 593 nm, which is ascribed to the 4 T 1 – 6 A 1 transitions of Mn 2+ ions. The excitation mechanism of the Mn 2+ ions is discussed according to a scheme of impact excitation by hot-electrons.