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Electrofluorescence Switching of Fluorescent Polymer Film
서석재,신해진,박치현,임한휘,김은경 한국고분자학회 2013 Macromolecular Research Vol.21 No.3
Electrofluorescence switching has attracted much research attention recently due to its potential applications in the areas of ion sensing, bio analysis, fluorescence imaging, and signaling recognition events. This review describes the chemical structure of electrofluorescent polymers their synthetic strategies, and their patterning characteristics. The designs of these polymers are based on fluorescence quenching through an energy transfer between a fluorophore and an acceptor, which is similar to various types of fluorescence-based sensors. Electrofluorescence devices were designed to demonstrate stable switching processes with different durations while measuring the photophysical properties. The patterning process has shown promise if used to create fluorescent displays, sensors, or for security document applications, but an investigation of patternable polymers and related mechanisms remains for future work.
서석재 ( Seog Jae Seo ),김병관 ( Byeong Guan Kim ),( Bhimrao D Sarwade ),김은경 ( Eun Kyoung Kim ) 한국화상학회 2013 한국화상학회지 Vol.19 No.1
근적외선 흡수 물질은 근적외선 이미징에 사용가능한 물질이며 최근에는 바이오 이미징, 유기태양전지 효율 향상을 목적으로 활용 범위가 확장되고 있다. 근적외선 흡수 물질은 π-conjugation system을 가지고 있으며 전자가 비편재화 되어 밴드갭이 작을수록 장파장 빛을 흡수한다. 주요 물질군으로는 유기 단분자 물질인 Polymethine, Phthalocyanine, Porphyrin 계 물질과 고분자인 Poly(thiophene), Poly(selenophene) 이 있으며, 유기 단분자 소재는 용매에 잘 녹으며 흡수 밴드가 Sharp 하고 고분자 소재는 용매에 잘 녹지 않으며 흡수 밴드가 Broad 한 특징이 있다. 최근 근적외선 응용 관련 분야의 대표적인 선도 연구로는 세포 이미징, 세포치료, 유기태양전지가 있다. Near-Infrared absorbing (NIA) materials are light absorbing materials of which absorption band is near-infrared (> 700nm). Though the absorption band is high, these materials still has attracted more attention due to their advantages in bio-imaging and bio-analysis, and organic photovoltaics. Their absorption band is originated due to the strong π-conjugation system, which resulting in low band gap materials. The representative NIA materials are two types; a) organic dyes such as Polymethines, Phthalocyanines, Porphyrins, b) conjugated polymers which includes Poly (thiophene)s, Poly(selenophene)s, etc. The organic dyes show sharp absorption band and easily soluble in organic solvents. Whereas, conjugated polymers show broad absorption band and hardly dissolve in organic solvent. These materials are explored in cell imaging, cancer therapy, and NIR absorbing organic photovoltaics applications.
박치현,서석재,신해진,김은경 한국화상학회 2012 한국화상학회지 Vol.18 No.2
Polydimethylsiloxane(PDMS) 몰드를 이용하여 Thermal Imprinting 방법을 통해 광변색 물질인Nitrospirobenzopyran(NSB)를 포함하는 Polystyrene 박막을 패터닝하였다. 패턴된 광변색 소자의 변색 및 탈색에 따른 흡광도 스펙트럼 및 회절효과를 조사된 자외선량에 따라 측정하여 자외선 조사량에따른 회절 효율 변화를 식으로 근사할 수 있었으며 회절 효율로부터 소자의 굴절률 변화량을 계산해 낼 수 있었다. 변색 전 회절효율은 6.75%, 공기와의 굴절률 차이 값은 0.078였으며, 200J/m2의 자외선량이조사된 후의 회절효율은 7.56%, 공기와의 굴절률 차이 값은 0.083로 나타났다. 광변색 패턴의 자외선에의한 회절효율의 변화는 자외선 감지에 효과적인 것으로 나타났다. Polystyrene film containing photochromic nitrospirobenzopyran(NSB) was patterned by the thermal imprinting method using a pre-patterned polydimethylsiloxane(PDMS) mold. Using photochromic patterned cell, diffraction efficiency(DE) and absorbance spectrum depending on ultraviolet light(UV) dose were obtained. The relationship between DE and UV dose were obtained also, and refractive index difference between patterned material and air were determined from the relationship. The refractive index difference between the polymer grating and medium was determined as 0.078 to 0.083, DE change was determined as 6.75% to7.56% from the irradiated UV dose at 0 to200J/m2, respectively. Thus such a large DE change by UV irradiation was found to be very effective for UV sensing.