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Study of color deterioration of fluorescent dyestuffs under white LEDs illumination

Research Project

Project/Area Number 18K01098
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 03060:Cultural assets study-related
Research InstitutionIndependent Administrative Institution National Institutes for Cultural Heritage Tokyo National Research Institute for Cultural Properties

Principal Investigator

YOSHIDA NAOTO  独立行政法人国立文化財機構東京文化財研究所, 保存科学研究センター, 保存環境研究室付 (80370998)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords染料 / LED / 展示照明 / 白色LED / 変退色 / 有機性文化財材料 / LED展示照明 / 有機染料 / 博物館照明 / 文化財材料 / 劣化
Outline of Final Research Achievements

The following findings were obtained through experiments and verifications using samples of yellow dyestuffs on silk fabric. (1) Even with the same white LED, the higher the color temperature, that is, the greater the contribution of blue light, the greater the amount of fluorescence with respect to the reflected light. (2) By long-term irradiation experiments in different wavelength bands, it was confirmed that the shorter the wavelength of the irradiation light, the faster the discoloration / fading rate. (3) Furthermore, it was demonstrated that with dyes having low light resistance, discoloration and fading and changes in the reflection spectrum become remarkable when light is irradiated on the wavelength side shorter than the absorption peak.

Academic Significance and Societal Importance of the Research Achievements

国内では、博物館等における展示照明の白色LED化が急速に進んでいる。一方で、展示物の変退色抑制を主眼とした照度基準や積算照度基準は、従来光源であるハロゲンランプや蛍光ランプの時代に提示されたものであり、これらとは発光原理、発光特性(分光分布)などが異なる白色LED光にそのまま適用されることが適切かどうかの実証的研究はないままであった。今回の研究では、特に白色LED光に特長的な狭い波長帯での鋭い発光ピークに着目し、特定波長帯での黄色染料への照射試験により、波長帯による相対的な変退色、色差増大の差を染料の吸収特性との関連で明らかにし、白色LED時代の安全な展示に資する知見を得た。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (2 results)

All 2020 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] 特定波長域を遮光した光照射下における 黄色系染料を主とした有機染料の変退色挙動2020

    • Author(s)
      相馬静乃、吉田直人、佐野千絵
    • Journal Title

      保存科学

      Volume: 60 Pages: 51-60

    • NAID

      40022591721

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 白色 LED の発光特性と彩色絵画の色彩との関係について2018

    • Author(s)
      吉田直人、石井恭子
    • Organizer
      文化財保存修復学会第40回大会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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