• Korean Journal of Optics and Photonics
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• v.21 no.1
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• pp.6-11
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• 2010

Fluorescent photopolymer film was prepared with composition containing acrylate monomer, binder, a visible light sensitive photo initiator, and fluorescent anthracene polymer. A fluorescent grating pattern was inscribed on the photopolymer film using a 2-beam coupling method. A 514 nm laser was coupled to generate a beam-interference pattern. A highly fluorescent diffractive line pattern was formed on the fluorescent photopolymer within 30 sec. of exposure. The fluorescence intensity was highly enhanced in the patterned area, possibly due to the change in the environment of the fluorescent polymers by the photo-polymerization of monomers. Under a photo-mask, a gap electrode pattern was formed of fluorescent gratings with a sub-micron scale, which was matched well to the calculated value ($2.5\;{\mu}m$ and $0.6\;{\mu}m$) based on the refractive index of the photopolymer and beam incident angle ($3.4^{\circ}$, $15^{\circ}$) to the photopolymer surface.

• Macromolecular Research
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• v.12 no.6
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• pp.615-617
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• 2004

We have developed an efficient method for the generation of patterned fluorescence images using a protected precursor molecule. The t-Boc-protecting group of a coumarin derivative was readily removed from a polymer film upon irradiation with UV light in the presence of a photoacid generator to provide the original properties of the coumarin. Fine fluorescence patterns were obtained when using this photolithographic method.

• Proceedings of the Optical Society of Korea Conference
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• 2007.07a
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• pp.267-268
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• 2007

• Korean Chemical Engineering Research
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• v.46 no.2
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• pp.211-216
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• 2008

Bufexamac which was used for treatment of atopic dermatitis is the drug which was made as the ointment. However, penetration rate of bufexamac was very low for the barrier effect of stratum corneum. Microneedle was used to increase transdermal delivery rate of the bufexamac. We tried to conjugate bufexamac and FITC for the detection of penetration rate of bufexamac. FITC-bufexamac was mixed in hydrogel for the treatment skin surface. Fluorescent spectrophotometer was used to analysis the concentration of FITC-bufexamac. Microscope using fluorescent filter was used to capture the image about location of FITC-bufexamac in the skin. We confirmed that permeation rate of bufexamac was increased with the treatment by microneedle and was increased by the increasing number treatment of microneedle.

• Journal of Pharmaceutical Investigation
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• v.38 no.6
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• pp.357-363
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• 2008

Penetration rate of large molecule through skin is very low due to the barrier effect of stratum corneum. Novel microneedle treatment device with roll was designed for transdermal delivery of large molecular drugs such as vaccine and protein drugs. The permeation rates of FITC labelled bovine serum albumin (FITC-BSA) as a model protein were determined using modified Franz diffusion cell and hairless mouse skin which were treated by hydrogel or solution containing FITC-BSA. Fluorescent spectrophotometer was used to analyze the concentration of FITC-BSA. Microscope using fluorescent filter was used to capture the image and location of FITC-BSA in the skin. We confirmed that permeation rate of BSA was increased with the treatment by microneedle and was increased by the increasing frequency of treatment. Furthermore, the permeation rate observed from hydrogel treated skin was significantly higher than that from solution treated skin.

• Macromolecular Research
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• v.16 no.7
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• pp.604-608
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• 2008

Color dye-doped silk fibroin nanoparticles were successfully fabricated using a microemulsion method. An aqueous silk fibroin solution was prepared by dissolving cocoons (Bombyx mori) in a concentrated lithium bromide solution followed by dialysis. A color dye solution was also mixed with the aqueous silk fibroin solution. The surfactants used for the microemulsion were then removed by methanol and ethanol, yielding color dye-doped silk fibroin nanoparticles, approximately 167 nm in diameter. The secondary structure of the nanoparticles showed a $\beta$-sheet conformation, as characterized by Fourier transform infrared spectroscopy. The morphology of the nanoparticles was determined by field emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy, and their size and size distribution were measured by dynamic light scattering. The color dye-doped silk fibroin nanoparticles were examined by confocal laser scanning microscopy.

• Journal of Biosystems Engineering
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• v.37 no.3
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• pp.209-213
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• 2012

Purpose: This study was performed to develop a simple, disposable thin-film optical nitrate sensor. Methods: The sensor was fabricated by applying a nitrate-selective polymer membrane on the surface of a thin polyester film. The membrane was composed of polyvinylchloride (PVC), plasticizer, fluorescent dye, and nitrate-selective ionophore. Fluorescence intensity of the sensor increased on contact with a nitrate solution. The fluorescence response of the optical nitrate sensor was measured with a commercial fluorospectrometer. Results: The optical sensor exhibited linear response over four concentration decades. Conclusions: Nitrate ion concentrations in plant nutrient solutions can be determined by direct optical measurements without any conditioning before measurements.

• Rapid Communication in Photoscience
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• v.2 no.1
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• pp.24-27
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• 2013

A polymeric photobase generator containing oxime-urethane groups is applied to a fluorescence micropatterning material. Polymer bearing oxime-urethane groups was prepared by copolymerization of methyl methacrylate with methacryloyloxyethyl benzophenoneoxime urethane (MBU). The reaction of amino groups in the irradiated copolymer film with dansyl chloride (Dns-Cl) was monitored by using UV absorption, IR absorption and fluorescence spectroscopy. The fluorescence spectrum of the Dns-Cl-treated irradiated copolymer film shows a strong fluorescence with a fluorescence maximum wavelength at 510 nm. A blue fluorescent micropattern with a line width of $2{\sim}3{\mu}m$ was obtained. Treatment of the irradiated copolymer film with Dns-Cl and rhodamine B mixture led to the formation of green, red, and orange-colored fluorescence micropatterns. Thus, various colored micropatterns on a single polymer film can be obtained by selective excitation of each dye molecules.

• Polymer Science and Technology
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• v.26 no.4
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• pp.282-289
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• 2015

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1050-1055
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• 2005

We report the development frontiers that are dictating the speed of adoption of polymer organic light emitting diode (P-OLED) technology in market applications. Our presentation includes both the developments taking place in materials and the rapid advances in the manufacturing processes used for solution processable P OLEDs. On the manufacturing side, the latest progress in ink jet printing process is discussed. On the materials side, we look at both fluorescent and phosphorescent material performance including the CDT development roadmap.