• Title/Summary/Keyword: Photochromic

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Photochromic Lens development to use Nano particle (1) - Photochromic Lens' estimation method and application - (Nano 입자를 이용한 Photochromic Lens 개발(1) - Photochromic Lens의 평가방법 및 적용 -)

  • Kim, Yong Geun;Seong, Jeong Sub
    • Journal of Korean Ophthalmic Optics Society
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    • v.7 no.2
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    • pp.169-174
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    • 2002
  • Make Photochromic lens Photochromism estimation method, and gouge photochromic lens and investigated UV light source to apply. UV light source irradiation ago and after wavelength dependence of photo-transmittance (T%) of darkening and fading state by do optical equipment which is consisted of spectrophotometer, light source, power meter and detecter. Use relative ratio value of maximum $T%{\times}{\lambda}$ area and saturated state area in light off. Dependences estimation introduced darkening efficiency $(K_d)=(1-C_1/A_1)/t_{on}$ relationship value course fading efficiency$(K_f)=(C_2/A_2)/t_{on}$ value during Photochromism's irradiation time in Photochromic lens. Wavelength dependence of transmittance (T%) has form of $T_m+T_1{\exp}[-(x_0-t)/a]$ in Darkening course fading state. Can receive each estimation parameter value as result that apply Photochromism's estimation parameter Z, $K_d$, $K_f$ in Photochromic lens.

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A study of transmittance and color change of various photochromic lenses by an UVA lamp (UVA광원에 의한 Photochromic lens의 색비율 제어에 관한 연구)

  • Lim, Yong-Moo;Jung, Ju Hyun
    • Journal of Korean Ophthalmic Optics Society
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    • v.8 no.2
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    • pp.185-191
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    • 2003
  • In this study, We measured transmittance and color change of various photochromic lens as a function of temperature(6, 12, $28^{\circ}C$), irradiation time of UVA lamp and the types of materials(plastic and glass) and distribution of photochromic ingredients(coated and bulk type). The coated-type photochromic lens showed higher saturated value than bulk-type lens without regard to temperature. And darkening rate of smoke color lenses were higher compare to brown lens in case of glass photochromic lens. All of photochromic lens passed ANSI Z80.3 regulation in transmittance and color independent of temperature. The saturated values of plastic photochromic lens excluded coated-type and glass photochromic lens were ranked as cosmetic use. The saturated value of coated-type. Tbr and TMs were general applications in $6^{\circ}C$ and $12^{\circ}C$, but cosmetic purpose in $28^{\circ}C$. The darkening rate was increased with decreasing temperature, whereas the fading rate became higher with increasing temperature.

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Preparation and Characteristics of Photochromic Plastic Lenses by Hard Coatings (하드코팅에 의한 광변색 플라스틱 렌즈의 제조 및 특성)

  • Yu, Dong-Sik;Ha, Jin-Wook;Moon, Byeong-Yeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1635-1641
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    • 2009
  • In this study, we have prepared plastic lenses with both photochromic and hard properties by hard coating, and evaluated their optical properties and surface characteristics. Photochromic effects could be observed on the UV spectra of the closed forms and the visible spectra of the open forms. Visible light transmittance of photochromic lenses was from 83.44% for graphite(GP) to 85.15% for blue(BL) in colourless state and from 71.10% for red(RE) to 79.98% for yellow(YE) in colour state. Red photochromic lens was higher in optical density(${\Delta}$OD) and color difference(${\Delta}$$E^{\ast}_\;{ab}$) than the others. Photochromic lenses applied by hard coating showed good adhesion, hot water resistance, chemical resistance and surface appearance. Also, compared to the uncoated lens, hardness and abrasion resistance were increased. Consequently, this coating system could impart functional properties such as photochromic and hard coating property onto ophthalmic lenses.

Preparation and Holographic Recording of Diarylethene-Doped Photochromic Films

  • Kim, Eun-Kyoung;Park, Ji-Young;Cho, Song-Yun;Kim, Nam;Kim, Jung-Hoi
    • ETRI Journal
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    • v.25 no.4
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    • pp.253-257
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    • 2003
  • This study investigated the photochromic properties and characterization of acetyl-substituted diarylethene (DAMBTF6)-doped fluoroacrylates media for holographic storage. For the rewritable holographic recording media, we prepared photochromic polymer films using an acrylate matrix by simple photocuring methods. Switching light sources from a visible (532 nm) to an ultraviolet (365 nm) produced transparent films that changed from pale yellow to red. Holographic recording was performed on the photochromic films by two interfering collimated plane wave beams. Excitation with a visible or ultraviolet light completely erased the records, and the film was rewritable either by 532 nm laser or by 325 nm laser within 2 seconds. Images were recorded onto a pixelated spatial light modulator with rectangular pixel apertures and reconstructed on the photochromic films to show recovery of the original images with high resolution.

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A Photochromic Dye Activation Method for Measuring the Thickness of Liquid Films

  • Kim, Jeong-Bae;Kim, Moo-Hwan
    • Bulletin of the Korean Chemical Society
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    • v.26 no.6
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    • pp.966-970
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    • 2005
  • To measure the thickness of liquid films from 10 to 60 ${\mu}m$, we used photochromic dye activation. And we used silicone oil with 10 centi-Stokes and commercial photochromic dyes. To make films with exact and known thicknesses, we used two glass wafers. A film formed between two wafers after placing a drop of liquid of known volume on one wafer and covering the other. The film thickness could be estimated from the diameter of wafer and the dropped liquid volume. To quantitatively evaluate the result, captured the images using digital camera then analyzed the images using the image tool. The gray scale intensity using the captured images of activated dye with these thicknesses showed the repeatability below ${\pm}$ 1.0% when measured with a silicone oil solution containing 0.1% SO and SO-ANTH dyes. And we showed that photochromic dye activation method could be used to measure our liquid film thickness ranges.

Preparation of Photochromic Coating Films Containing Spiropyran by Sol-Gel Method (Sol-Gel법에 의해 Spiropyran을 함유한 광 변색 코팅 막의 제조)

  • Jeong, Sang Hyeok;Cho, Kyung In;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.46 no.1
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    • pp.112-117
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    • 2008
  • Organic-inorganic hybrid solutions were prepared via sol-gel method using glycidoxypropyl trimethoxysilane (GPTMS) and methyl triethoxysilane (MTES) as starting precursors at a molar ratio of 1:1. The photochromic coating solutions were prepared by mixing the solutions of photochromic dye (spiropyran) dissolved in ethylacetate (EA) with the organic-inorganic hybrid solutions. Photochromic films were prepared on polycarbonate substrate by spin coating and cured for 2 h at $100^{\circ}C$. The resulting films exhibited a reversible color change upon irradiation with UV light. The photochromic properties of the films showed that the color-fading speed increases with increasing the EA content in the coating solutions.

Characterization of Photopolymers films containing triazine methacrylate monomer for photochromic diffractive image formation (광변색 회절 이미지 형성을 위한 트라이아진계 메타아크릴레이트 모노머를 포함한 광고분자 필름의 특성평가)

  • Oh, Hyun-Jin;Lee, Ji-Yea;kim, Eun-Kyoung
    • Transactions of the Society of Information Storage Systems
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    • v.3 no.4
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    • pp.173-177
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    • 2007
  • A photo-reactive methacrylate monomer having triazine as a core component was examined for photochromic diffractive image formation. Photochromic photopolymer films as a recording media contained a monomer mixture of triazine difunctional metharylate (DT) and ethylene glycol phenyl ether acrylate, binder polymer, photo initiator, and a photochromic spiro-oxazine dye. The content of photochromic dye was changed to examine the effect of photochromophore on diffraction efficiency and real holographic image formation. Holographic recording was performed on the photopolymer film by the combination of reference and probe beam. The diffraction efficiency of the photopolymer film in real-time measurement reached a maximum of $\sim90%$ within 30s. It was highly dependent on the photochromophore contents. After holographic recording, the color of the recorded area was changed under UV light (365 nm) and reversibly bleached to original color upon exposure to a visible light source. Films containing only photochromophore without monomer mixture were not reactive under the recording beam (491nm). Diffractive image formation and mechanism of the holographic recording in the presence of photochromophore will be presented.

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Photochromic Properties of Spiropyran in Hard Coating Films Made by Sol-Gel Method (Sol-Gel 하드 코팅 막에서의 Spiropyran의 광 변색 특성)

  • Jeong, Sang Hyeok;Cho, Kyung In;Park, Jeong Yong;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.46 no.2
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    • pp.310-315
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    • 2008
  • Organic-inorganic hybrid solutions were made using glycidoxypropyl trimethoxysilane (GPTMS) and vinyltriethoxysilane (VTES) as starting materials by sol-gel method. Photochromic coating solutions were prepared by mixing the solution of photochromic dye (spiropyran) dissolved in ethylacetate with the organic-inorganic hybrid solutions. Photochromic films were prepared on polycarbonate sheets by spin coating and cured for 2 h at $100^{\circ}C$. The resulting films exhibited a reversible color change upon irradiation with UV light from transparent to blue. The color-fading speed and pencil hardness of the coating films increased with increasing the GPTMS content in the coating solutions.

Synthesis of New Bicyclic Aziridines Containing Chalcone Analogs and Investigation of Their Photochromic Properties

  • Besharati-Seidani, Tayebeh;Mahmoodi, Nosrat O.
    • Bulletin of the Korean Chemical Society
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    • v.34 no.3
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    • pp.875-883
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    • 2013
  • Ten new derivatives of 1,3-diazabicyclo[3.1.0]hex-3-enes linked via ether linkage to chalcones were synthesized and characterized by UV, FT-IR, $^1H$ NMR and $^{13}C$ NMR spectral techniques. The spectra of all synthesized compounds, confirmed structure-photochromic behavior relationships (SPBR) both in solution or in solid state by irradiation under UV light at 254 nm. In other efforts for first time photochromic behavior of ketoaziridines has been investigated.

Stability of Photochromism in New Bifunctional Copolymers Containing Spiropyran and Chalcone Moiety in the Side Chain

  • Choi, Dong-Hoon;Ban, Si-Young;Kim, Jae-Hong
    • Bulletin of the Korean Chemical Society
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    • v.24 no.4
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    • pp.441-445
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    • 2003
  • We synthesized three copolymers bearing photochromic spiropyran dye and chalcone moiety in the side chain for studying the dynamic properties of their photochromism. They contain methacrylate-spiropyran (MAspiropyran) and methacrylate-chalcone (MA-chalcone) with the different concentration. The photosensitivity of the newly synthesized copolymers was investigated by using UV-Vis absorption spectroscopy. We observed photodimerization and photochromic behavior under UV irradiation at the same time. The effect of photocrosslink on the rate and stability of photochromism in three copolymers was considered in this study. This study might be helpful to design photochromic materials for irreversible optical memory by virtue of photocrosslinking reaction.