TY - JOUR
T1 - Steric-Hindrance-Functionalized Polydiarylfluorenes
T2 - Conformational Behavior, Stabilized Blue Electroluminescence, and Efficient Amplified Spontaneous Emission
AU - Bai, Lubing
AU - Liu, Bin
AU - Han, Yamin
AU - Yu, Mengna
AU - Wang, Jiong
AU - Zhang, Xinwen
AU - Ou, Changjin
AU - Lin, Jinyi
AU - Zhu, Wensai
AU - Xie, Linghai
AU - Yin, Chengrong
AU - Zhao, Jianfeng
AU - Wang, Jianpu
AU - Bradley, Donal D.C.
AU - Huang, Wei
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - Control of the hierarchical molecular organization of polydiarylfluorenes by synthetic strategies is significant for optimizing photophysical properties as well as the performance of light-emitting devices. Herein, for the suppression of molecular aggregation and enhancement of luminescence efficiency, a series of steric units were introduced into polydiarylfluorenes by copolymerization, with the aim of integrating the advantages of the steric-hindrance effect and of the β-phase. Optical and Raman spectroscopies revealed a β-phase conformation for a polymer copolymerized with spiro[fluorene-9,9′-xanthene] (SFX), with photoluminescence (PL) peaks at 454, 482, and 517 nm. Moreover, the morphological stability and electroluminescence (EL) stability were also improved without compromising the performance of the polymer light-emitting diodes (PLEDs). Furthermore, three steric-hindrance-functionalized copolymers showed significantly decreased thresholds for amplified spontaneous emission (EthASE) and enhanced stability following thermal annealing treatment. These results indicate that steric-hindrance functionalization is a superior approach to improve the overall stability and optoelectronic properties for blue-light-emitting π-conjugated polymers.
AB - Control of the hierarchical molecular organization of polydiarylfluorenes by synthetic strategies is significant for optimizing photophysical properties as well as the performance of light-emitting devices. Herein, for the suppression of molecular aggregation and enhancement of luminescence efficiency, a series of steric units were introduced into polydiarylfluorenes by copolymerization, with the aim of integrating the advantages of the steric-hindrance effect and of the β-phase. Optical and Raman spectroscopies revealed a β-phase conformation for a polymer copolymerized with spiro[fluorene-9,9′-xanthene] (SFX), with photoluminescence (PL) peaks at 454, 482, and 517 nm. Moreover, the morphological stability and electroluminescence (EL) stability were also improved without compromising the performance of the polymer light-emitting diodes (PLEDs). Furthermore, three steric-hindrance-functionalized copolymers showed significantly decreased thresholds for amplified spontaneous emission (EthASE) and enhanced stability following thermal annealing treatment. These results indicate that steric-hindrance functionalization is a superior approach to improve the overall stability and optoelectronic properties for blue-light-emitting π-conjugated polymers.
KW - amplified spontaneous emission
KW - electroluminescence
KW - polydiarylfluorene
KW - spirofluorene
KW - β-phase conformation
UR - https://www.scopus.com/pages/publications/85032653559
U2 - 10.1021/acsami.7b08980
DO - 10.1021/acsami.7b08980
M3 - 文章
C2 - 28991431
AN - SCOPUS:85032653559
SN - 1944-8244
VL - 9
SP - 37856
EP - 37863
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 43
ER -