TY - JOUR
T1 - Diarylmethylene-bridged triphenylamine derivatives encapsulated with fluorene
T2 - Very high Tg host materials for efficient blue and green phosphorescent OLEDs
AU - Fan, Cong
AU - Chen, Yonghua
AU - Jiang, Zuoquan
AU - Yang, Chuluo
AU - Zhong, Cheng
AU - Qin, Jingui
AU - Ma, Dongge
PY - 2010
Y1 - 2010
N2 - Two bridged triphenylamine/fluorene hybrids, BTPAF1 and BTPAF2, were designed and synthesized through Friedel-Crafts reaction. Their thermal, electrochemical, electronic absorption and photoluminescent properties were fully investigated. Very high glass transition temperatures (Tg) were observed at 204°C for BTPAF1 and 211°C for BTPAF2, owing to the introduction of rigid fluorene and bridged triphenylamine unit. The encapsulation of a fluorene unit at the para positions of bridged triphenylamine greatly enhances their electrochemical stability. The linkage by the quaternary carbon atom of the fluorene moiety (C-9) effectively prevents the extension of π-conjugation of the bridged triphenylamine core, and consequently means that the compounds have a high triplet energy of 2.86 eV. Phosphorescent organic light-emitting devices (PHOLEDs) fabricated by using the two compounds as the hosts and the blue emitter bis[2-(4′,6′-difluorophenyl)pyridinato-N, C2′]iridium(iii) picolate (FIrpic) as the guest exhibit good EL performances with a maximum current efficiency of 20 cd A-1, a maximum power efficiency of 14 lm W-1, and a maximum external quantum efficiency of 9.4%. Green electrophosphorescent devices by using green-emitter iridium(iii) fac-tris(2-phenylpyridine) [Ir(ppy)3] as guest and the two new compounds as the hosts display excellent EL performances with a maximum current efficiency of 75 cd A-1, a maximum power efficiency of 60 lm W-1, and a maximum external quantum efficiency of 19.5%. The device figures of merit, together with the excellent morphological and electrochemical stabilities, make the new compounds ideal host materials for PHOLEDs, especially for high-temperature applications of devices.
AB - Two bridged triphenylamine/fluorene hybrids, BTPAF1 and BTPAF2, were designed and synthesized through Friedel-Crafts reaction. Their thermal, electrochemical, electronic absorption and photoluminescent properties were fully investigated. Very high glass transition temperatures (Tg) were observed at 204°C for BTPAF1 and 211°C for BTPAF2, owing to the introduction of rigid fluorene and bridged triphenylamine unit. The encapsulation of a fluorene unit at the para positions of bridged triphenylamine greatly enhances their electrochemical stability. The linkage by the quaternary carbon atom of the fluorene moiety (C-9) effectively prevents the extension of π-conjugation of the bridged triphenylamine core, and consequently means that the compounds have a high triplet energy of 2.86 eV. Phosphorescent organic light-emitting devices (PHOLEDs) fabricated by using the two compounds as the hosts and the blue emitter bis[2-(4′,6′-difluorophenyl)pyridinato-N, C2′]iridium(iii) picolate (FIrpic) as the guest exhibit good EL performances with a maximum current efficiency of 20 cd A-1, a maximum power efficiency of 14 lm W-1, and a maximum external quantum efficiency of 9.4%. Green electrophosphorescent devices by using green-emitter iridium(iii) fac-tris(2-phenylpyridine) [Ir(ppy)3] as guest and the two new compounds as the hosts display excellent EL performances with a maximum current efficiency of 75 cd A-1, a maximum power efficiency of 60 lm W-1, and a maximum external quantum efficiency of 19.5%. The device figures of merit, together with the excellent morphological and electrochemical stabilities, make the new compounds ideal host materials for PHOLEDs, especially for high-temperature applications of devices.
UR - http://www.scopus.com/inward/record.url?scp=77950408790&partnerID=8YFLogxK
U2 - 10.1039/b927576b
DO - 10.1039/b927576b
M3 - 文章
AN - SCOPUS:77950408790
SN - 0959-9428
VL - 20
SP - 3232
EP - 3237
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 16
ER -