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1998 Fiscal Year Final Research Report Summary

Investigation of Highly Efficient Phosphors for Field Emission Displays

Research Project

Project/Area Number 08650985
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 工業物理化学
Research InstitutionTokyo University of Technology

Principal Investigator

YAMAMOTO Hajime  Tokyo University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (00247298)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Shinji  Tottori University, Dept. of Engineering, Research Associate, 工学部, リサーチアソシエーツ
MITA Yoh  Tokyo University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (20200040)
Project Period (FY) 1996 – 1998
KeywordsField Emission Disnlave / Phosphors / Luminescence Efficiency / Mixed Valency / Electron TraDs / ImDuritv Doping / Charge Compensation / Planar Faults
Research Abstract

Field emission displays (FED) are new thin, flat displays, which can reproduce moving pictures with fast response. This work has explored phosphors, which can meet the requirements of low-voltage, high-density electron excitation ; I.e. sufficient electrical conductivity and ruggedness as well as high efficiency.
(1) Oxides containing elements with mixed valency.
It was found that partial substitution of Al with either Ga or In in green-emitting YィイD23ィエD2AlィイD25ィエD2OィイD212ィエD2 : Tb decreases electrical resistivity of the phosphor, resulting in suppression of electrical charging of the phosphor surface. Presumably mixed valency of such elements as Ga, In or Ti increases the oxygen vacancy concentration, leading to a decrease in the resistivity.
(2) Mechanism of efficiency improvement by addition of a IIIb-group element.
Addition of a IIIb-group element, e.g. Al, to a red-emitting phosphor SrTiOィイD23ィエD2 : Pr increases the luminescence efficiency by more than 200 times. This work has elucid … More ated two types of mechanism operating for this effect ; (a) charge compensation between PrィイD13ィエD1+ at SrィイD12ィエD1+ sites and AlィイD13ィエD1+ at TiィイD14ィエD1+ sites and (b) elimination of planar faults in SrTiOィイD23ィエD2, crystals (thin SrO layers) by formation of Sr-aluminates.
An efficiency can be improved also in other compounds with planar faults, e.g. Ruddlesden-Popper phases. Similar Al-addition effect observed in SrInィイD22ィエD2OィイD24ィエD2 : PrィイD13ィエD1+ has been investigated based on the above consideration.
(3) Feasibility of a conventional blue phosphor, ZnS : Ag, Al, as an FED phosphor
A commercial CRT phosphor ZnS : Ag, Al has a high efficiency, but it shows considerable luminance saturation under high-density excitation. This work investigated traps, which possibly induce Auger process, the main nonradiative process. Optical measurements show that deep impurity levels by Ag and Al are responsible to the Auger process. The luminance saturation is, therefore, caused by the factor inherent to the material composition. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] H.Yamamoto and Y.Suda: "Luminescence of Rare-earth-activated Ga-containing Oxides by Low-energy Electron Excitation"Journal of SID(Society for Information Displays). 6/3. 177-179 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Okamoto,H.Kobayashi & H.Yamamoto: "Enhancement of Characteristic Red Emission from SrTiO_3:Pr^<3+> by Al Addition"Journal of Applied Physics. 86[10]. 5594-5597 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yamamoto,S.Okamoto & S.Mitsumine: "New Oxide Phosphors for FEDs;Ruddlesden-Popper Phases Synthesized with III-Group Elements,"Proceedings of International Display Workshops '99. 805-808 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Okamoto,S.Tanaka & H.Yamamoto: "Reduction Process of Ruddlesden-Popper-Type Planar Faults in SrTiO_3:Pr^<3+> by Al Addition"Electrochemical and Solid-State Letters. 3(5). 242-244 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yamamoto & S.Okamoto: "Efficiency Enhancement by Al Addition to Some Oxide Phosphors for Field Emission Displays"Displays. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Okamoto,H.Kobayashi & H.Yamamoto: "Characteristic Enhancement of Emission form SrTiO_3:Pr^<3+> by Addition to Some"Journal of Applied Physics. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Yamamoto and Y. Suda: "Luminescence of Rare-earth-activated Ga-containing Oxides by Low-energy Electron Excitation"Journal of SID. 6/3. 177-179 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Okamoto H.Kobayashi & H. Yamamoto: "Enhancement of Characteristic Red Emission from SrTiO3 : Pr3+ by Al Addition"Journal of .Applied Physics. 86[10]. 5594-5597 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Yamamoto, S. Okamoto & S. Mitsumine: "New Oxide Phosphors for FEDs ; Ruddlesden-Popper Phases Synthesized with III-Group Elements"Proceedings of International Display Workshops. 805-808 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Okamoto, S. Tanaka & H. Yamamoto: "Reduction Process of Ruddlesden-Popper-Type Planar Faults in SrTiOィイD23ィエD2 : PrィイD13+ィエD1 by Al Addition"Electrochemical and Solid-State Letters. 3 (5). 242-244 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Yamamoto & S. Okamoto: "Efficiency Enhancement by Al Addition to Some Oxide Phosphors for Field Emission Displays"Displays. (to be pubIishe). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Okamoto, H. Kobayashi & H. Yamamoto: "Characteristic Enhancement of Emission from SrTiOィイD23ィエD2 : PrィイD13+ィエD1 by Addition of IIIb-group ion"Journal of .Applied Physics. (to be published). (2000)

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

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Published: 2001-10-23  

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