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주철웅,조현수,권병화,조남성,김유현,김윤희,이종희 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
In this work, hybrid-WOLEDs are fabricated by employing single emitting layers (S-EMLs), which consist of 5-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azasiline (DTPDDA) as a blue thermally activated delayed fluorescent (TADF) emitter and bis(2-methyldibenzo[f,h]quinoxaline) (acetylacetonate)iridium(III) (Ir(MDQ)2acac) as a phosphorescent red emitter. This architecture employs EMLs of a blue exciplex-forming co-host, which are hole transport type host material was 1,3-bis(N-carbazolyl) benzene (mCP) and the electron transport type host material was diphenylphosphine oxide-4-(triphenylsilyl)phenyl (TSPO1). The resulting hybrid-WOLEDs showed maximum external quantum efficiency (EQE) of 6.16% and current efficiency (CE) of 11.58 cd/A with Commission Internationale de L’Eclairage coordinates of (0.32, 0.33).
주철웅,Gunel Huseynova,JIANG YIFEI,유재민,김용현,조남성,이재현,김윤희,이종희 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
High-efficiency solution-processed blue organic light-emitting diodes (OLEDs) were developed usingtwo thermally activated delayedfluorescence (TADF) aromatic molecules, 10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2,5-dimethylphenyl)-10H-spiro[acridine-9,90-fluorene] (TXSA) and 10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)-2-methylphenyl)-10H-spiro[acridine-9,90-fluorene] (TTSA), composed of spiroacridinedonor and triazine acceptor units. As a result, the blue devices based on two novel TADF moleculesexhibited remarkable electroluminescence with a high quantum efficiency of 14.94% and currentefficiency of 29.29 cd/A by optimization of emitter doping concentration and properties of the electrontransporting layer. Our results demonstrate that TXSA and TTSA TADF molecules are prospectivematerials to fabricate high-performance solution-processed blue OLEDs with a simple device structure.
주철웅 ( Chul Woong Joo ),이종희 ( Jong Hee Lee ),문제현 ( Jea Hyun Moon ),조남성 ( Nam Sung Cho ) 한국공업화학회 2016 공업화학전망 Vol.19 No.3
OLED (Organic light emitting diode) 기술의 지속적인 발전과 투자로 인하여 테플릿 PC, 웨어러블기기와 같은 중소형 디스플레이부터 대형 OLED TV까지 OLED 디스플레이는 폭넓은 포트폴리오를 보유하게 되었고 이로인하여 차세대 디스플레이로써 자리매김 하였다. 동시에 고유의 우수한 백색광 색품질로 OLED는 디스플레이에서 조명응용분야로 확대되고 있다. 현재 우리나라는 OLED 디스플레이와 조명의 두 가지 분야에 세계적 기술 경쟁력을 보유하고 있다. OLED 분야는 향후에 우리나라의 산업경쟁력을 견인하는 핵심적 역할을 담당할 것이다. 본 기고문에서는 에너지 효율이 높은 OLED 광원을 구현하기 위하여 요구되는 광추출 기술과 향후 전망에 대하여 다방면으로 논하였다.
조현수,주철웅,권병화,강찬모,최수경,신진욱 한국전자통신연구원 2023 ETRI Journal Vol.45 No.6
The optical properties of the materials composing organic light-emitting diodes (OLEDs) are considered when designing the optical structure of OLEDs. Optical design is related to the optical properties, such as the efficiency, emission spectra, and color coordinates of OLED devices because of the microcavity effect in top-emitting OLEDs. In this study, the properties of top-emitting blue OLEDs were optimized by adjusting the thicknesses of the thin metal layer and capping layer (CPL). Deep blue emission was achieved in an OLED structure with a second cavity length, even when the transmittance of the thin metal layer was high. The thin metal film thickness ranges applicable to OLEDs with a second microcavity structure are wide. Instead, the thickness of the thin metal layer determines the optimized thickness of the CPL for high efficiency. A thinner metal layer means that higher efficiency can be obtained in OLED devices with a second microcavity structure. In addition, OLEDs with a thinner metal layer showed less color change as a function of the viewing angle.
조현수,주철웅,최수경,강찬모,김기헌,신진욱,권병화,이현구,변춘원,조남성 한국전자통신연구원 2021 ETRI Journal Vol.43 No.6
Microdisplays based on organic light‐emitting diodes (OLEDs) have a small form factor, and this can be a great advantage when applied to augmented reality and virtual reality devices. In addition, a high‐resolution microdisplay of 3000 ppi or more can be achieved when applying a white OLED structure and a color filter. However, low luminance is the weakness of an OLED‐based microdisplay as compared with other microdisplay technologies. By applying a tandem structure consisting of two separate emission layers, the efficiency of the OLED device is increased, and higher luminance can be achieved. The efficiency and white spectrum of the OLED device are affected by the position of the emitting layer in the tandem structure and calculated via optical simulation. Each white OLED device with optimized efficiency is fabricated according to the position of the emitting layer, and red, green, and blue spectrum and efficiency are confirmed after passing through color filters. The optimized white OLED device with color filters reaches 97.8% of the National Television Standards Committee standard.
잉크젯 프린팅 원리를 적용한 디스플레이 기술 개발 동향
권병화,주철웅,B.H. Kwon,C.W. Joo 한국전자통신연구원 2023 전자통신동향분석 Vol.38 No.1
Inkjet printing is a typical printing technology with many advantages, such as material cost reduction, noncontact pattern formation without a mask, and process simplification. With the recent and rapid development of ink materials, parts and equipment, and process technologies related to inkjet printing, it is becoming a major process in various areas of the display industry. In particular, for the QD-OLED (quantum dot-organic light-emitting diode) display announced by Samsung Display in 2022, quantum dot pixel production by applying inkjet printing is a key technology. We analyze inkjet printing technology for mass production applied to the display industry and discuss the technology development trends in academia and industry toward the realization of next-generation displays.