• Polymer(Korea)
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• v.39 no.1
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• pp.174-179
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• 2015

Alignments of photo-reactive mesogen were induced using bare glass substrates without a polymer alignment layer. It was found by using polarized FTIR spectroscopy, polarized microscopy, and birefringence measurement experiments that the reactive mesogen could be aligned along the rubbing direction although the glass substrate without an alignment layer was used. The induction mechanism of the rubbed bare glass is ascribed to that polymers from rubbing clothes are coated on the glass substrate along the rubbing direction and lead the alignment of liquid crystals through intermolecular interactions.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.64-65
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• 2007

High-efficiency white organic light-emitting diodes (WOLEDs) were fabricated with two emissive layers and exciton blocking layer was sandwiched between two phosphorescent dyes which were, bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (Flrpic) as blue emission and a newly synthesized red phosphorescent material guest, Bis(5-benzoyl-2-phenylpyridinato-C,N)iridium(III) (acetylacetonate) ((Bzppy)2Ir(III)acac). This exciton blocking layer prevents a triple-triple energy transfer between the two phosphorescent emissive layers with balanced emission of blue and red. The white device showed the Commission Internationale d'Eclairage (CIEx,y) coordinates of (0.34, 0.40) at the maximum luminance of $24100\;cd/m^2$ and maximum luminous efficiency of 22.4 cd/A, respectively.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1470-1473
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• 2007

We have demonstrated the optimization of white organic light-emitting diodes with two separated emissive layers using a blue fluorescent and a red phosphorescent dopant. The maximum luminous efficiency of the devices showed 7.93, 9.70, 11.8, and 14.3 cd/A. The $CIE_{xy}$ coordinates also showed (x = 0.33, y = 0.36), (x = 0.33, y = 0.35), (x =0.31, y = 0.35), and (x = 0.29, y = 0.36) at 6V, respectively.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.661-664
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• 2004

In this paper, it was demonstrated that the organic thin film transistors with the organic gate insulators were fabricated by vapor deposition polymerization (VDP) processing. The configuration of OTFTs was a staggered-inverted top-contact structure and gate dielectric layer was deposited with 0.45 ${\mu}m$ thickness. In order to form polyimide as a gate insulator, VDP process was also introduced instead of spin-coating process. Polyimide film was respectively co-deposited with different materials. One was from a 4,4'-oxydiphthalic anhydride (ODPA) and 4, 4'-oxydianiline (ODA) and the other was from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and ODA. And it was also cured at 150 $^{\circ}C$ for 1 hour followed by 200 $^{\circ}C$ for 1 hour. Electrical characteristics of the organic thin-film transistors were detailed comparisons between the ODPA-ODA and the 6FDA-ODA which were used as gate insulator.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08b
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• pp.1522-1525
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• 2007

In this study, flat fluorescent lamps (FFLs) having surface discharge structures was fabricated by screen printing technique and were studied using spectraradiometer and square pulse power supply. Two types of FFLs having different shapes of electrodes (crosstype and line-type structure) were compared with variation of discharge shape and mixed gas ratio.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.318.1-318.1
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• 2007

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.430-432
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• 2002

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.292.1-292.1
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• 2008

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.45.2-45.2
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• 2008

• Journal of Powder Materials
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• v.13 no.2 s.55
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• pp.144-149
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• 2006

In this research we tried to make nano-sized TiNx by using planetary milling, and we made the composites double layered of titanium and nano-sized TiNx by using spark plasma sintering apparatus after mixing with the different ratio of pure titanium powder, and they were heat treated at $850^{\circ}C$ for 30 minutes. The crystal structures of nano-sized TiNx powders and the composites were analyzed by X-ray diffraction (XRD). The microstructures of the powders were analyzed by using scanning electron microscopy (FESEM) and the 40-50 nm size of nano-sized TiNx particle on the surface of agglomerated particles was investigated. With increasing the ratio of nano-sized TiNx of the composites, the microvickers hardness of the composites was increased.