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이동륜,유지광,한시현,이준엽 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
각 치환기의 위치에 따른 효과를 확인하기 위해 정색 인광 유기 발광 다이오드(OLEDs)의 dibenzofuran를 이용한 호스트 물질로 9-(Dibenzo[b,d]furan-1-yl)-9H-3,9’-bicarbazole(1DBFCz), 9-(dibenzo[b,d]furan-2-yl)-9H-3,9’-bicarbazole(2DBFCz), 9-(dibenzo[b,d]furan-3-yl)-9H-3,9’-bicarbazole(3DBFCz), and 9-(dibenzo[b,d]furan-4-yl)-9H-3,9’-bicarbazole(4DBFCz)를 합성했다. 1DBFCz, 2DBFCz, 3DBFCz and 4DBFCz 의 HOMO와 LUMO는 각각 -5.99eV/-2.58eV, -5.99eV/-2.65eV, -5.99eV/-2.63eV 그리고 -5.99eV/-2.62eV로 확인했다. 또한, 3DBFCz를 제외한 나머지 세 물질은 2.9eV 이상의 높은 삼중항과 청색 소자에서 25%이상의 높은 외부양자효율을 가졌다. 3DBFCz의 전자수송능력이 낮기 때문에 전하 불균형을 이뤄 낮은 효율을 나타낸 것이다.
Thermally activated delayed fluorescence from phthalonitrile based donor-acceptor molecules
이동륜,이준엽,이칠원 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
In this work, phthalonitrile derivatives of 4,5-bis(5H-benzofuro[3,2-c] carbazol-5-yl)phthalonitrile (BFCz-2CN) and 4,5-bis(5H-benzo[4,5] thieno[3,2-c]carbazol-5-yl)phthalonitrile (BTCz-2CN) were synthesized as thermally activated delayed fluorescence (TADF) dopant material. To exhibit TADF characteristic, phthalonitrile was used as electron acceptor, and 5H-benzofuro[3,2-c]carbazole and 5H-benzo[4,5]thieno[3,2-c] carbazole were used as electron donors. The ΔE<sub>ST</sub> of BFCz-2CN and BTCz-2CN were 0.13eV and 0.17eV, respectively. As fluorescent organic light emitting diodes dopant materials, BFCz-2CN and BTCz-2CN showed maximum quantum efficiencies of 12.4% and 11.4%, with CIE coordinates of (0.20, 0.42) and (0.20, 0.41), respectively.
천식 환자의 올바른 흡입기 사용습관 형성을 위한 보조기구 개발
이동륜,차유미,최수현,박신영,임덕신,신승원 대한기계학회 2021 기술과 교육 Vol.9 No.2
Asthma is a disease that causes breathing difficulties, repeated coughing and in severe cases acute seizures. To effectively treat asthma, it is important to use the inhaler in the right way. However, there is little way to provide immediate feedback of correct usage of inhalers. In this research, assisting device for the proper inhaler usage is proposed based on the market research and user interview. Three major errors (leveling, enough flow rate and breath holding) were selected. Especially to secure enough flow rate, CFD analysis was performed for basic design and quantitative experimental confirmation was followed. Finally, the prototype of a inhaler usage monitoring device was manufactured which can provide immediate feedback on each error during the inhalation. 천식은 호흡곤란, 기침을 반복적으로 일으키며 심할 경우 급성 발작을 유발하는 질병이다. 천식의 효과적인 치료를 위해서는 올바른 방법으로 흡입기를 사용하는 것이 매우 중요하다. 하지만 천식 환자의 흡입기 사용에 관한 즉각적 교정 수단은 존재하지 않는다. 따라서 시장조사, 사용자 인터뷰를 활용 하여 흡입기의 올바른 사용을 보조할 수 있는 기구를 설계하고자 하였다. 흡입기에서 주로 발생하는 사용 오류 3가지(수평 유지, 충분한 유량 확보 및 숨 참기)를 바탕으로 설계문제를 정의하고 특히 중요한 유량 확보를 위해 전산 유체 해석을 활용하여 기초 설계를 수행하고 직접 실험으로 검증하였다. 최종적 으로 프로토타입을 제작하여 흡입기 사용 과정에서 각 오류에 대해 즉각적으로 피드백을 제시하는 흡입 모니터링 기구의 성능을 확인하였으며, 이는 천식 환자들의 지속적이고 장기적인 사용습관 교정을 가능하게 할 것으로 기대한다.
이동륜,이칠원,이준엽 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this study, highly efficient green thermally activated delayed fluorescent (TADF) device with 31.2% external quantum efficiency (EQE) was developed by using a single host system. Green TADF emitting material, (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN), was doped into a bipolar host material, 3-(3-(carbazole-9-yl)phenyl) pyrido[3``,2``:4,5]furo[2,3-b]pyridine (3CzPFP), and 1% doped film showed high photoluminescence quantum yield of 100%. Green TADF organic light-emitting diodes (OLEDs) using 3CzPFP:4CzIPN system exhibited maximum EQE of 31.2%, which is the highest value in the area of TADF devices. This result demonstrated that TADF OLEDs can exhibit high EQE as good as phosphorescent OLEDs and it will be a good alternative high efficiency OLED.
Development of highly efficient blue and green thermally activated delayed fluorescent devices
이동륜,이칠원,이준엽 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In this study, highly efficient thermally activated delayed fluorescent (TADF) emitters, 9,9′,9″-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)benzene-1,2,3-triyl)tris(9H-carbazole) (TCzTrz), 9,9′,9″-(5-(4,6-diphenyl-1,3,5-triazin-2-yl)benzene-1,2,3-triyl)tris(3,6-dimethyl-9H-carbazole) (TmCzTrz) and 9,9`-(2-(3,6-dimethyl-9H-carbazol-9-yl)-5-(4,6-diphenyl-1,3,5-triazin-2-yl)-1,3-phenylene)bis(9H-carbazole) (DCzmCzTrz), which contain three carbazole type donors in their backbone structure. Three compounds showed small singlet-triplet gaps of 0.07~0.20 eV and high photoluminescence quantum yields of 84~100%. As a result, blue device with TCzTrz as a TADF emitter achieved high external quantum yield (EQE) of 25.0% and green devices with TmCzTrz and DCzmCzTrz also showed high EQE of 25.5 and 21.3%, respectively.