TY - JOUR
T1 - Efficient blue organic light-emitting diodes based on triphenylimidazole substituted anthracene derivatives
AU - Mu, Guangyuan
AU - Zhuang, Shaoqing
AU - Zhang, Wenzhi
AU - Wang, Yixin
AU - Wang, Bo
AU - Wang, Lei
AU - Zhu, Xunjin
N1 - Funding Information:
This research work was supported by the NSFC/China ( 21161160442 and 51203056 ), the National Basic Research Program of China (973 Program 2013CB922104 ) and the Analytical and Testing Centre at Huazhong University of Science and Technology is acknowledged for characterization of new compounds. Zhu thanks Hong Kong Baptist University (Grants FRG2/12-13/050 ) for financial support.
PY - 2015/6
Y1 - 2015/6
N2 - A series of new blue emissive materials based on the conjugates of highly fluorescent diaryl anthracene and electron-transporting triphenylimidazole moieties: 2-(4-(anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (ACBI), 2-(4-(10-(naphthalen-1-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (1-NaCBI), 2-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (2-NaCBI) were designed and synthesized successfully. These materials exhibit good film-forming properties and excellent thermal stabilities. Meanwhile, the decreased π-conjugation in these compounds compared with phenanthroimidazole derivatives leads to obvious hypsochromic shift. To explore the electroluminescence properties of these materials, typical three-layer organic light-emitting devices were fabricated. With respect to the three layer device 2 using 1-NaCBI as the emitting layer, its maximum current efficiency reaches 3.06 cd A-1 with Commission Internationale del'Eclairage (CIE) coordinates of (0.149, 0.092). More interestingly, sky blue doped device 5 based on 1-NaCBI achieved a maximum current efficiency of 15.53 cd A-1 and a maximum external quantum efficiency of 8.15%, high EQE has been proved to be induced by the up-conversion of a triplet excited state.
AB - A series of new blue emissive materials based on the conjugates of highly fluorescent diaryl anthracene and electron-transporting triphenylimidazole moieties: 2-(4-(anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (ACBI), 2-(4-(10-(naphthalen-1-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (1-NaCBI), 2-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-1,4,5-triphenyl-1H-imidazole (2-NaCBI) were designed and synthesized successfully. These materials exhibit good film-forming properties and excellent thermal stabilities. Meanwhile, the decreased π-conjugation in these compounds compared with phenanthroimidazole derivatives leads to obvious hypsochromic shift. To explore the electroluminescence properties of these materials, typical three-layer organic light-emitting devices were fabricated. With respect to the three layer device 2 using 1-NaCBI as the emitting layer, its maximum current efficiency reaches 3.06 cd A-1 with Commission Internationale del'Eclairage (CIE) coordinates of (0.149, 0.092). More interestingly, sky blue doped device 5 based on 1-NaCBI achieved a maximum current efficiency of 15.53 cd A-1 and a maximum external quantum efficiency of 8.15%, high EQE has been proved to be induced by the up-conversion of a triplet excited state.
KW - 1,4,5-Triphenyl-1H-imidazole
KW - Anthracene
KW - Blue material
KW - Organic light-emitting devices
KW - Triplet-triplet annihilation
UR - http://www.scopus.com/inward/record.url?scp=84923924845&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2015.02.018
DO - 10.1016/j.orgel.2015.02.018
M3 - Journal article
AN - SCOPUS:84923924845
SN - 1566-1199
VL - 21
SP - 9
EP - 18
JO - Organic Electronics
JF - Organic Electronics
ER -