최근 OLED의 발광층은 여러 가지 색을 구현하기 위해 dopant와 host materials을 혼합하여 사용한다. OLED 소자의 발광 효율을 높이기 위해 사용하는 host materials은 매우 중요한 역할을 한다. 본 연구에서는 phenylcarbazole 유도체를 출발 물질로 하여 pyrazole 합성과 suzuki reaction을 통해 새로운 초록, 노랑 host materials를 합성하였다. 합성한 화합물은 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1 -phenyl-1H-pyraz-ol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H- pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-2), 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazole (F-3), 4'-(3,6-Bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphe-nyl]-4-amine (F-4)이다. 합성한 각각의 화합물은 128℃ 이상의 높은 ...
최근 OLED의 발광층은 여러 가지 색을 구현하기 위해 dopant와 host materials을 혼합하여 사용한다. OLED 소자의 발광 효율을 높이기 위해 사용하는 host materials은 매우 중요한 역할을 한다. 본 연구에서는 phenylcarbazole 유도체를 출발 물질로 하여 pyrazole 합성과 suzuki reaction을 통해 새로운 초록, 노랑 host materials를 합성하였다. 합성한 화합물은 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1 -phenyl-1H-pyraz-ol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H- pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-2), 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazole (F-3), 4'-(3,6-Bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphe-nyl]-4-amine (F-4)이다. 합성한 각각의 화합물은 128℃ 이상의 높은 Tg 값을 가지고 F-1, F-3는 초록색 인광 OLED, F-2, F-4는 노랑 인광 OLED로 제작이 가능하다. F-1, F-3의 경우 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP)와 비슷한 물리적 특성을 갖고 초록색 인광 host materials로 이용할 수 있다. 결과적으로 F-1은 CBP와 비슷한 turn-on voltage (2.5 V)와 낮은 구동전압 4.3 V (CBP: 4.5 V)를 보인다. F-1을 사용한 device의 경우 전류 및 전압 효율이 48.8 cd/A, 47.4 lm/W로 CBP (45.6 cd/A, 39.7 lm/W)에 비해 높다. 그리고 외부 양자 효율은 15%를 보인다. F-2, F-4의 경우 상대적으로 낮은 ET 값을 갖고 따라서 노란색 인광 host materials로 이용할 수 있다. 결과적으로 F-2는 CBP와 비슷한 turn-on voltage (2.9 V)와 낮은 구동전압 4.7 V (CBP: 4.9 V)를 보인다. F-2를 사용한 device의 경우 전류 및 전압 효율이 61.8 cd/A, 64.7 lm/W로 CBP (60.8 cd/A, 63.3 lm/W)에 비해 높다. 외부양자 효율은 20.8%를 보인다.
최근 OLED의 발광층은 여러 가지 색을 구현하기 위해 dopant와 host materials을 혼합하여 사용한다. OLED 소자의 발광 효율을 높이기 위해 사용하는 host materials은 매우 중요한 역할을 한다. 본 연구에서는 phenylcarbazole 유도체를 출발 물질로 하여 pyrazole 합성과 suzuki reaction을 통해 새로운 초록, 노랑 host materials를 합성하였다. 합성한 화합물은 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1 -phenyl-1H-pyraz-ol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H- pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-2), 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazole (F-3), 4'-(3,6-Bis(1-(3,4-dimet- hylphenyl)-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphe-nyl]-4-amine (F-4)이다. 합성한 각각의 화합물은 128℃ 이상의 높은 Tg 값을 가지고 F-1, F-3는 초록색 인광 OLED, F-2, F-4는 노랑 인광 OLED로 제작이 가능하다. F-1, F-3의 경우 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP)와 비슷한 물리적 특성을 갖고 초록색 인광 host materials로 이용할 수 있다. 결과적으로 F-1은 CBP와 비슷한 turn-on voltage (2.5 V)와 낮은 구동전압 4.3 V (CBP: 4.5 V)를 보인다. F-1을 사용한 device의 경우 전류 및 전압 효율이 48.8 cd/A, 47.4 lm/W로 CBP (45.6 cd/A, 39.7 lm/W)에 비해 높다. 그리고 외부 양자 효율은 15%를 보인다. F-2, F-4의 경우 상대적으로 낮은 ET 값을 갖고 따라서 노란색 인광 host materials로 이용할 수 있다. 결과적으로 F-2는 CBP와 비슷한 turn-on voltage (2.9 V)와 낮은 구동전압 4.7 V (CBP: 4.9 V)를 보인다. F-2를 사용한 device의 경우 전류 및 전압 효율이 61.8 cd/A, 64.7 lm/W로 CBP (60.8 cd/A, 63.3 lm/W)에 비해 높다. 외부양자 효율은 20.8%를 보인다.
A series of phenylcarbazole and pyrazole based bipolar host materials were designed, synthesized and characterized for green and yellow based phosphoroscent OLEDs. Namely, 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-phenyl-1H-pyrazol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H-pyr...
A series of phenylcarbazole and pyrazole based bipolar host materials were designed, synthesized and characterized for green and yellow based phosphoroscent OLEDs. Namely, 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-phenyl-1H-pyrazol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-2), 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-(3,4-dimethylphenyl)-1H-pyrazol-3-yl)-9H-carbazole (F-3), 4'-(3,6-Bis(1-(3,4-dimethylphenyl)-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-4). All synthesized host materials were exhibited higher thermal stabilities manifested as transition glass temperature over 128℃. Host F-1 and F-3 were fabricated with green phosphorescence based OLED, while F-2 and F-4 were yellow phosphorescence OLED devices. Host F-1 and F-3 were shown similar physical properties with reference 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) host material. As a result, F-1 was revealed similar turn on voltage (2.5 V), lower driving voltage of 4.3 V than CBP (4.5 V). Device based on F-1 was shown better maximum current and power efficiencies of 48.8 cd/A, 47.4 lm/W than reference host material (45.6 cd/A, 39.7 lm/W) and expressed identical external quantum efficiencies (EQE) near 15%. Host F-2 and F-4 based yellow phosphorescence devices were shown similar physical properties with reference CBP host material. As a result, F-2 was revealed similar turn on voltage (2.9 V), lower driving voltage of 4.7 V than CBP (4.9 V). Device based on F-2 was performed better maximum current and power efficiencies of 61.8 cd/A, 64.7 lm/W than reference host material (60.8 cd/A, 63.3 lm/W) and expressed higher external quantum efficiencies (EQE) of 20.8%.
A series of phenylcarbazole and pyrazole based bipolar host materials were designed, synthesized and characterized for green and yellow based phosphoroscent OLEDs. Namely, 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-phenyl-1H-pyrazol-3-yl)-9H-carbazole (F-1), 4'-(3,6-Bis(1-phenyl-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-2), 9-(4'-(9H-Carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-3,6-bis(1-(3,4-dimethylphenyl)-1H-pyrazol-3-yl)-9H-carbazole (F-3), 4'-(3,6-Bis(1-(3,4-dimethylphenyl)-1H-pyrazol-3-yl)-9H-carbazol-9-yl)-N,N-diphenyl-[1,1'-biphenyl]-4-amine (F-4). All synthesized host materials were exhibited higher thermal stabilities manifested as transition glass temperature over 128℃. Host F-1 and F-3 were fabricated with green phosphorescence based OLED, while F-2 and F-4 were yellow phosphorescence OLED devices. Host F-1 and F-3 were shown similar physical properties with reference 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) host material. As a result, F-1 was revealed similar turn on voltage (2.5 V), lower driving voltage of 4.3 V than CBP (4.5 V). Device based on F-1 was shown better maximum current and power efficiencies of 48.8 cd/A, 47.4 lm/W than reference host material (45.6 cd/A, 39.7 lm/W) and expressed identical external quantum efficiencies (EQE) near 15%. Host F-2 and F-4 based yellow phosphorescence devices were shown similar physical properties with reference CBP host material. As a result, F-2 was revealed similar turn on voltage (2.9 V), lower driving voltage of 4.7 V than CBP (4.9 V). Device based on F-2 was performed better maximum current and power efficiencies of 61.8 cd/A, 64.7 lm/W than reference host material (60.8 cd/A, 63.3 lm/W) and expressed higher external quantum efficiencies (EQE) of 20.8%.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.