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1996 Fiscal Year Final Research Report Summary

Studies on the Strain in Manganese (II)-Doped Metal-Chalconide Films and Their Luminescent Properties

Research Project

Project/Area Number 07650782
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionShizuoka University

Principal Investigator

NAKAMURA Takato  Shizuoka University, Materials Science and Technology, Professor, 工学部, 教授 (10022287)

Co-Investigator(Kenkyū-buntansha) NAKANISHI Yoichiro  Shizuoka University, Research Institute of Electronics, Associate Professor, 電子工学研究所, 助教授 (00022137)
Project Period (FY) 1995 – 1996
KeywordsII-IV compounds / Thin films and superlattices / Lattice distortion / Electron spin resoance / Photoluminescence
Research Abstract

Electron spin resonance (ESR) spectroscopy has been applied to investigate unusual phenomena observed in the photoluminescence (PL) of Mn (II)-containing superlattices of CdS : Mn-ZnS and CdTe : Mn compared with thin films of ZnS : Mn, CdS : Mn and CdTe : Mn, which were grown on a GaAs (100) substrate by means of hot wall epitaxy.
For the ZnS : Mn thin films the lowest-energy transition assigned to M_I=-5/2 splits into either a triplet or quintet depending on the thickness of the film when the magnetic field normal to it. Computer simulation of both spectra confirmed that the ESR parameters obtained correspond to those for a single crystal of cubic structure, although the apparent lineshape are different each other. It is presumed that the difference is due to the uniaxial deformation of the crystal field surrounding Mn (II) derived from the lattice mismatch between the films and substrate. Similar phenomena are observed for the CdTe : Mn films on GaAs (100) substrate as well. However, there is no difference appeared in PL between those thin films and the bulk crystals.
For the CbS : Mn-ZnS superlattices a negative shift of g-value is observed, implying that the covalency between Mn (II) and its environment in CdS layr is affected by the lattice mismatch between the alternate layrs of ZnS and CdS.For the CdTe : Mn-ZnS superlattices narrow six hyperfine lines with a large hyperfine splitting constant compare with that of the bulk CdTe : Mn crystals are also found at room temperature. These result not only from the compressive distortion of the Mn-Te bond length but also by an increase in the ionicity of the bond itself due to electron transfer from Te to Mn (II) being less significant. which leads to the change in the valence and/or conduction bands of CdTe relative to the 3d^5 energy levels of Mn (II). Consequently, it is concluded that the unusual red luminescence observed at room temperature is due to these dramatic change happened in the CdTe : Mn layrs.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] T. Nakamura: "Manganese (II) in superlattices consisting of alternate cadmium telluride and zinc sulfide layers" J. Chem. Soc. Faraday Transactions. 92. 4247-4250 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nakamura: "Manganese (II) in superlattices consisting of alternate U.cadmium telluride and zinc sulfide layrs" J.Chem.Soc.Faraday Trans.92. 4247-4250 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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