TY - JOUR
T1 - Carbazole/phenylpyridine hybrid compound as dual role of efficient host and ligand of iridium complex
T2 - Well matching of host-dopant for solution-processed green phosphorescent OLEDs
AU - Jiang, Tao
AU - Wang, Fangfang
AU - Tang, Chao
AU - Zhang, Xinwen
AU - Cao, Xudong
AU - Tao, Youtian
AU - Huang, Wei
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/3
Y1 - 2018/3
N2 - A new bipolar transport material of 9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (2,4-dCzPPy) is designed and synthesized through a simple catalyst free C-N coupling reaction. The carbazole/phenylpyridine hybrid 2,4-dCzPPy is functionalized as dual role of efficient host material and cyclometalated ligands for green emissive Iridium (III) complex of bis(9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole))(acetylacetonato) Ir(dCzPPy)2(acac). Their thermal, photophysical, electrochemical, and electrolumiescent (EL) properties are fully investigated. The D-π-A structure of bipolar compound of 2,4-dCzPPy suppresses the direct intramolecular interaction between the donor and acceptor subunits to give high triplet energy of 2.70 eV. Besides, solution processable electrophosphorescent devices by using 2,4-dCzPPy/Ir(dCzPPy)2(acac) as host/dopant to form emissive layers at a dopant concentration of 8 wt% show a maximum luminescence of 28622 cd/m2 at 10.3 V and maximum current efficiency of 31.8 cd/A, which is significantly higher than other host/dopant combinations, such as 21 cd/A of 4,4′-bis(9-carbazolyl)biphenyl (CBP):Ir(dCzPPy)2(acac) and 15 cd/A of 2,4-dCzPPy:tris(2-4-tolyl phenylpyridine) iridium (Ir(mppy)3), suggesting the well matching of the new host/dopant system which involves 2,4-dCzPPy both as the host matrix and the ligand of phosphorescent emitter.
AB - A new bipolar transport material of 9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (2,4-dCzPPy) is designed and synthesized through a simple catalyst free C-N coupling reaction. The carbazole/phenylpyridine hybrid 2,4-dCzPPy is functionalized as dual role of efficient host material and cyclometalated ligands for green emissive Iridium (III) complex of bis(9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole))(acetylacetonato) Ir(dCzPPy)2(acac). Their thermal, photophysical, electrochemical, and electrolumiescent (EL) properties are fully investigated. The D-π-A structure of bipolar compound of 2,4-dCzPPy suppresses the direct intramolecular interaction between the donor and acceptor subunits to give high triplet energy of 2.70 eV. Besides, solution processable electrophosphorescent devices by using 2,4-dCzPPy/Ir(dCzPPy)2(acac) as host/dopant to form emissive layers at a dopant concentration of 8 wt% show a maximum luminescence of 28622 cd/m2 at 10.3 V and maximum current efficiency of 31.8 cd/A, which is significantly higher than other host/dopant combinations, such as 21 cd/A of 4,4′-bis(9-carbazolyl)biphenyl (CBP):Ir(dCzPPy)2(acac) and 15 cd/A of 2,4-dCzPPy:tris(2-4-tolyl phenylpyridine) iridium (Ir(mppy)3), suggesting the well matching of the new host/dopant system which involves 2,4-dCzPPy both as the host matrix and the ligand of phosphorescent emitter.
KW - Dopant
KW - Host
KW - Iridium (III) complex
KW - Ligand
KW - Phosphorescent OLED
KW - Solution-process
UR - http://www.scopus.com/inward/record.url?scp=85034068945&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2017.11.004
DO - 10.1016/j.dyepig.2017.11.004
M3 - 文章
AN - SCOPUS:85034068945
SN - 0143-7208
VL - 150
SP - 130
EP - 138
JO - Dyes and Pigments
JF - Dyes and Pigments
ER -