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Development of Tunable Color Electro Luminescent Device

Research Project

Project/Area Number 63850089
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 計測・制御工学
Research InstitutionOsaka University

Principal Investigator

HAMAKAWA Yoshihiro  Osaka University, Faculty of Engineering Science, Professor, 基礎工学部, 教授 (10029407)

Co-Investigator(Kenkyū-buntansha) TAKAKURA Hideyuki  Toyama Prefectural University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30112022)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 1990: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1988: ¥9,000,000 (Direct Cost: ¥9,000,000)
KeywordsThin Film Electro lunimescent (TFEL) Device / Tunable color Electro luminescent (TCEL) Device / Flat Panel Display / Zinc Sulfide (ZnS) / カラ-ディスプレイ素子 / 硫化亜鉛 / ホットエレクトロン / 発光中心 / 二重絶縁層 / 電子ビ-ム蒸着 / チューナブルカラーEL / 薄膜EL素子 / 積層型誘電層 / 担体注入 / 酸化ニオブ / 発光中心の高濃度添加
Research Abstract

In view of the recently growing large potential needs for multi-coloring in flat panel display systems, tunable color EL (TCEL) device which varies emission color by controlling applied voltage, has been developed by color mixing of dual or triple monochrome EL cells.
For color mixing methods for the dual color TCEL, for example, two kinds of primary color cells are stacked vertically on a glass substrate. In this case, ZnS : TbF_3 and ZnS : SmF_3 are used as emission layers, and two sources of driving voltage are applied across the top and bottom electrorodes to the middle ITO as the common electrode. To drive this control system, We have studied three kinds of color control methods : (a) applying two sources of sinusoidal wave voltage with their amplitude moderation, (b) applying square wave pulse voltage with their pulse width modulation and (C) applying a number of constant pulse voltage with their pulse code moderation.
Most of the significant results obtained in this work are summe … More rlized as following ;
1. We have succeeded to realize R, G, B primary color emission with the TFEL (thin film electro luminescent) devices, with active layer materials of ZnS : TbF_3 and ZnS : SmF_3 and ZnS : TmF_3, respectively.
2. Low threshold voltage project has also been accomplished by new kinds of thin film dielectrics PbTiO_3, Nb_2O_5/Y_2O_3 as an insulating layer.
3. The dual color TCEL and the triple color TCEL devices are developed.
4. As the emission color control system, pulse code modulation has best availability for practical operations in view of stability, constant visual emission intensity with color regulation.
5. The emitted color in the full color TCEL device are comparable with those of the CRT of a conventional color TV set
The TCEL devices developed in this work have a wide variety of potential applications such as multi-indication systems in the aviation electronics, car electronics and traffic signal control systems. The obtained results in full-color TCEL show a realistic evidence of possibility for a flat panel color television. Less

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report

Research Products

(17 results)

All Other

All Publications (17 results)

  • [Publications] Y.Hamakawa,R.Fukao and H.Fujikawa:""Tunable Color Electroluminescent Cells"" OptoelectronicsーDevice and Technologies. vol.3. 31-46 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Hamakawa,H.Fujikawa,M.Nakamura,T.Deguchi and R.Fukao: ""Tunable Color Electroluminescence Disply Operated by Pulse Code Moduration"" Electroluminescence(Springer Proceedings in Physics 38). 286-290 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R.Fukao,H.Fujikawa,M.Nakamura,Y.Hamakawa and S.Ibuki: ""High Luminance ZnS:Sm,F Thin Film Electroluminescent Devices Using Ferroelectric PbTiO_3 Thin Film"" Electroluminescence(Springer Proceedings in Physics 38). 164-166 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R.Fukao,H.Fujikawa and Y.Hamakawa: ""Improvement of Luminous Efficiency in ZnS:Tb,F ThinーFilm Electroluminescent Devices Using Ferroelectric PbTiO_3 and Silicon Nitride as Carrier Accelerating Buffer Layers"" Jpn.J.Appl.Phys.vol.12. 2446-2449 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Hamakawa, R. Fukao and H. Fujikawa: "Tunable Color Electro luminescent Cells" Optoelectronics-Device and Technologies. vol. 3. 31-46 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y. Hamakawa, H. Fujikawa, M. Nakamura, T. Deguchi and R. Fukao: "Tunable Color Electro luminescence Disply Operated by Pulse Code Modulation" Electro luminescence (Springer Proceedings in Physics 38). 286-290

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R. Fukao, H. Fujikawa, M. Nakamura, Y. Hamakawa and S. Ibuki: "High Luminance ZnS : Sm, F Thin Film Electro luminescent Devices Using Ferroelectric PbTiO_3 Thin Film" Electro luminescence (Springer Proceedings in Physics 38). 164-166

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] R. Fukao, H. Fujikawa and Y. Hamakawa: "Improvement of Luminous Efficiency in ZnS : Tb, F Thin-Film Electro luminescent Devices Using Ferroelectric PbTiO_3 and Silicon Nitride as Carrier Accelerating Buffer Layers" Jpn. J. Appl. Phys.Vol. 12. 2446-2449 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Y.Hamakawa,R.Fukao and H.Fujikawa:""Tunable Color Electroluminescent Cells"" OptoelectronicsーDevice and Technologies. vol.3. 31-46 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Hamakawa,H.Fujikawa,M.Nakamura,T.Deguchi and R.Fukao: ""Tunable Color Electroluminescence Disply Operated by Pulse Code Moduration"" Electroluminescence(Springer Proceedings in Physics 38). 286-290 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] R.Fukao,H.Fujikawa,M.Nakamura,Y.Hamakawa and S.Ibuki: ""High Luminance ZnS:Sm,F Thin Film Electroluminescent Devices Using Ferroelectric PbTiO_3 Thin Film"" Electroluminescence(Springer Proceedings in Physics 38). 164-166 (1988)

    • Related Report
      1990 Annual Research Report
  • [Publications] R.Fukao,H.Fujikawa and Y.Hamakawa: ""Improvement of Luminous Efficiency in ZnS:Tb,F ThinーFilm Electroluminescent Devices Using Ferroelectric PbTiO_3 and Silicon Nitride as Carrier Accelerating Buffer Layers"" Jpn.J.Appl.Phys.vol.12. 2446-2449 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yoshihiro HAMAKAWA: OPTOELECTRONICS-Devices and Technologies. 3. 31-46 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.Hamakawa: 4th Intern.Workshop on Electroluminescence. 154-155 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] R.Fukao: 4th Intern.Workshop on Electroluminescence. 46-47 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] R.Fukao: Applied Surface Science. 33/34. 1229-1235 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 藤川久喜: 電子情報通信学会技術研究報告. EID87ー85. 1-6 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-03-31   Modified: 2016-04-21  

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