http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
브라벤트,채규윤,김소현,정하수,김근화 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A bipolar material DBTO-IN/ CAR (2-(5-phenylindolo[3,2-a]carbazol- 12(5H)-yl)dibenzothiophene 5,5-dioxide) was designed and synthesized. The material revealed an excellent glass transition temperature (Tg) of 156 °C. We have fabricated two different devices, namely a non-doped bipolar fluorescent emitter and a green phosphorescent OLED with DBTO-IN/CAR as host material. The DBTO-IN/CAR host material-based device exhibited excellent maximum current and power efficiencies of 51.98 cd/A and 45.36 lm/W, respectively. The DBTOIN/ CAR-based host device revealed a good external quantum efficiency of 19.03%. Moreover, a non-doped DBTO-IN/CAR fluorescent emitter related device showed better current and external quantum efficiencies of 4.30 cd/A and 2.47%, respectively, with the cyan emission.
Carbazole and triphenylamine used as high hole mobility hole transporting materials for OLEDs
브라벤트,채규윤 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this study, we were designed, synthesized and characterized four thermally stable hole transporting materials with carbazole and triphenylamine moieties. The designed materials were synthesized by using single step Suzuki coupling reaction with better yield percentage. The HOMO energy levels of all HTMs were noticed between -5.62 to -5.48 eV, which can facilitate an effective hole transporting pathway. Triphenylamine based HTM 2A and 2B showed better properties when compare with carbazole core based HTM 1A and 1B. HTM 2A was showed higher current efficiency of 30.6 cd/A, which is higher than that of NPB (27.9 cd/A) based similar device. The external quantum efficiency (EQE) of HTM 2A was at 26.7%, which is extremely higher than other materials used in our current study. Moreover, HTM 2A based hole only device (HOD) revealed higher hole mobility of 5.3* 10<sup>-4</sup> ㎠ V<sup>-1</sup> s<sup>-1</sup> and which is more suitable candidate for hole transporting materials.
최승유,브라벤트,채규윤 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this work, two new hole transporting materials namely, HTM 1A and HTM 1B were synthesized by using Suzuki coupling and Buchwald- Hartwig reactions with significant yields. HTM 1A and HTM 1B showed higher glass transition temperature of 110 °C and 180 °C, respectively. The HOMO energy levels were between -5.54 to -5.33 eV and the energy levels were supported with proper charge hopping pathway to ensure the device efficiencies. To investigate the properties of our new design, we fabricated green PhOLED devices. HTM 1B showed better current and power efficiencies of 16.16 cd/A and 11.17 lm/W. At the same time, HTM 1B revealed excellent external quantum efficiencies of 13.64%. The efficiencies were considerably higher than that of Spiro-NPB and NPB-based reference devices.
2P-321 Triphenylamine based hole transporting materials for OLEDs
한지훈,채규윤,브라벤트,양기훈,국선 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Triphenylamine based four hole transporting materials namely, 4a, 4b, 5a and 5b were designed and synthesized by using Suzuki cross coupling reaction. All synthesized materials were revealed higher thermal stabilities except HTM 4a. HOMO levels of all materials were lying between 5.38 eV to 5.44 eV and were match with the adjacent layers to ensure the charge hopping pathway. Further properties were investigated after OLED device fabrication. HTM 5a based device was shown similar current ( 28.4 cd/A) and power (22.3 lm/W) efficiencies with NPB based reference device. Device based on HTM 4a and 4b wereexhibited poor efficiencies when compared with other HTM based devices.