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Gasonoo, Akpeko,Kim, Jae-Min,Yoo, Seung-Jun,Cho, Yong-Joon,Lee, Jeong-Hwan,Choi, Yoonseuk,Kim, Jang-Joo,Lee, Jae-Hyun Elsevier 2019 ORGANIC ELECTRONICS Vol.67 No.-
<P><B>Abstract</B></P> <P>We investigated the charge generation mechanism of electrically doped organic semiconductors (OSs) by electron spin resonance (ESR) analysis. ESR spectroscopy was used to successfully evaluate the radical density of <I>p</I>-doped OSs to estimate the charge transfer efficiency (CTE) of various doped systems. The results showed that the CTE is efficient close to 100% if the dopant molecules are homogenously dispersed and the energy difference (<I>ΔE</I>) between the highest occupied molecular orbital (HOMO) level of the host molecule and lowest unoccupied molecular orbital (LUMO) level of the p-dopant is large. The charge separation efficiency to form free carriers from the radicals is rather low (less than 12% in this study) and is a dominant factor controlling the charge generation efficiency (CGE). An organic dopant molybdenum tris[1,2-bis(trifluoromethyl)ethane-1,2-dithiolene] turns out to be an efficient dopant with the CGE of 9.7% due to high CTE originating from homogenous dispersion of the organic p-dopants and low LUMO level, i.e., large <I>ΔE</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Films of organic semiconductors (OSs) are doped with an organic <I>p</I>-dopant. </LI> <LI> Charge generation (CG) is studied by electron spin resonance spectroscopy. </LI> <LI> High CG efficiency of 9.7% is achieved for a film with 2 mol% <I>p</I>-dopant. </LI> <LI> The efficiency of charge transfer is 83% while that of charge separation is 11.6%. </LI> <LI> High CG efficiency is because of homogeneous dispersion of <I>p</I>-dopant in OS matrix. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Akpeko Gasonoo,Jeong‑Hwan Lee,Young‑Ji Lim,Seung‑Hun Lee,Yoonseuk Choi,Jae‑Hyun Lee 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5
Poly-para-xylylene C (Parylene C) and Aluminium Nitride (AlN) multilayered thin films using a single chamber are proposedto achieve transparent passivation for organic light-emitting diodes (OLED). Parylene C-AlN multilayered thin filmswere obtained through a sequential deposition of Parylene C layers by an optimized chemical vapor deposition as well asdeposition of AlN layers by radio frequency reactive sputtering within a short process time at room temperature. An OLEDpassivated with the thin film showed a significant extension of shelf-life of 400 h at 25 °C and 30% RH without any formationof dark spots during the shelf-life analysis, while a reference OLED without any passivation film was degraded within24 h. In addition, the multilayered passivation films exhibited considerable optical transparency with transmittance greaterthan 85% in the visible range. This result demonstrates that Parylene C-AlN multilayered films can be successfully depositedwithin a short time at room temperature in a single chamber for passivation applications in transparent flexible OLEDs andother organic electronic devices.
Akpeko Gasonoo,Hyeon-Sik Ahn,Jonghee Lee,Min-Hoi Kim,Jae-Hyun Lee,Yoonseuk Choi 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.1
We investigated light extraction film based on polymer dispersed liquid crystal (PDLC) for application in organic light emitting diodes (OLEDs). At least 30 seconds of direct UV irradiation process for curing PDLC film on a bottom-emitting OLEDs was successfully achieved without damage on the intrinsic properties of the OLED. We demonstrated that high haze and transmittance can be tuned simultaneously by controlling the UV curing time. By adding PDLC as an external layer without any additional treatment, the light scattering and extraction is increased. Consequently, a PDLC scattering film with 89.8% and 59.9 of total transmittance and haze respectively, achieved about 16% of light intensity enhancement from integrating sphere measurement.
RF Magnetron 스퍼터링 공정을 이용한 BIPV용 산화 금속 다중층 컬러 유리 구현 기술 연구
Akpeko Gasonoo,안현식,김민회,이재현,최윤석 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.4
본 연구에서는 건물 외벽 태양광 발전 통합 시스템(BIPV: Building Integrated Photovoltaic System)용 컬러 유리의 구조를 제안하고 이를 구현하기 위한 공정 기술을 개발하였다. 굴절률 값이 다른 두 종류의 산화 금속 박막을 집적함으로써 투과도가 우수하면서도 서로 다른 컬러를 구현할 수 있음을 파동광학에 기반한 전산모사를 통해서 확인하였다. 선택된 구조를 구현하기 위해 RF Magnetron 증착 방법을 통해 목표로 하는 두께를 균일하게 얻을 수 있는 공정을 개발하였다. 실험 시편에대한 광학적 분석을 전산모사 결과와 비교하여 분석한 결과, 원하는 컬러 유리를 랩 스케일에서 안정적으로 구현할 수 있음을 알 수 있었으며, 상온에서 일주일 이상의 안정성을 갖는 것을 확인하였다. 이러한 기술은 BIPV 건축물을 구축하는 데에유용할 것으로 기대된다. In this study, we propose the structure of color glass for BIPV (Building Integrated Photovoltaic System) and developprocess technology to realize it. It was verified through computer simulation based on wave optics that two differentkinds of metal oxide thin films with different refractive indices could be integrated to realize different colors with goodtransmittance. To fabricate the structure, we used RF Magnetron deposition method to achieve the target thicknessuniformly. The optical analysis of the samples was carried our by comparing with the results of computer simulationsand it was found that this technique can be stably implemented on lab scale. The stability test over weeks wasconfirmed at room temperature. This method is expected to be very useful in BIPV buildings
BIPV 시스템을 위한 전이 산화 금속 다중층 컬러 유리 구현 기술 연구
안현식,Akpeko Gasonoo,장은정,김민희,이재현,최윤석 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.4
이 논문에서는 전이 금속 산화물(TMO)층으로 구성된 다층 박막을 사용하는 BIPV(Building Integrated Photovoltaic)시스템용 전면 컬러 유리를 제안하였다. 몰리브덴 산화물(MoO3) 및 텅스텐 산화물(WO3)은 굴절률 차이가 큰 계면을형성하여 적절한 간섭효과를 얻을 수 있다. 단일 Thermal Evaporator 증착 방법을 통해 다층 박막을 제작함으로써 간단하고 빠르며 저렴한 제조 방법을 제안하였다. MoO3(60nm)/WO3(100nm) 다층 박막으로 90% 이상의 광 투과율을 갖는 자홍색 유리를 시연하였으며, 이 기술은 상용화된 BIPV 시스템에 유용할 것으로 기대된다 This paper proposed colored front panel glass for Building Integrated Photovoltaic (BIPV) systems using multi-layeredthin films composed of transition metal oxide (TMO) layers. Molybdenum oxide (MoO3) and tungsten oxide (WO3)provided complementary and suitable materials in making effective interference of reflected light from interfaces withsignificant difference in refractive indices. A simple, fast, and cheap fabrication method was achieved by depositing themulti-layer films in a single thermal evaporator. Magenta colored glass with optical transmittance of more than 90% wasachieved with MoO3(60nm)/WO3(100nm) multi-layered film. This technology could play in a critical role in commercialBIPV system applications.
Solution-processed colored electrodes for ITO-free blue phosphorescent organic light-emitting diodes
Huseynova Gunel,임영지,Gasonoo akpeko,주철웅,유재민,이승훈,박재영,조남성,Kim Yong Hyun,이종희,Lee Jae-Hyun 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.1
Reported herein are solution-processed polymer anode electrodes for blue phosphorescent organic light-emitting diodes (PhOLEDs). The highly conductive anodes were made from 10-wt%-methylred-( MR)-doped poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) (PH1000) films. The red-colored and uniform polymer films demonstrated electrical conductivity values that significantly increased from 0.25 to 50 S·cm−1 after doping. The more than 200-fold enhancement in conductivity indicates that the doped films have a lower sheet resistance and better hole injection and transport properties than the pristine films. The resultant PhOLEDs based on the doped polymer anodes exhibited stable, broad, and intense blue emission at 468nm with a 2616 cd·m−2 maximum luminance and a 4 V turn-on voltage. The obtained study results confirmed the effectiveness of the MR dye as a dopant for the significant enhancement of the conductivity and effective hole injection of PEDOT:PSS. Efficient future flexible optoelectronic applications can be built using this highly conductive polymer electrode obtained via a simple, solution-processed, and cost-effective doping approach.