Premium
Heteroatomic Conjugated Polymers and the Spectral Tuning of Electroluminescence via a Supramolecular Coordination Strategy
Author(s) -
Lin Jinyi,
Liu Bin,
Yu Mengna,
Xie Linghai,
Zhu Wensai,
Ling Haifeng,
Zhang Xinwen,
Ding Xuehua,
Wang Xuhua,
Stavrinou Paul N.,
Wang Jianpu,
Bradley Donal D. C.,
Huang Wei
Publication year - 2016
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201600445
Subject(s) - supramolecular chemistry , electroluminescence , polyfluorene , materials science , fluorene , photoluminescence , oled , diode , conjugated system , polymer , photochemistry , optoelectronics , crystallography , chemistry , nanotechnology , crystal structure , layer (electronics) , composite material
The unique electronic structures of heteroatomic conjugated polymers (HCPs) offer an attractive platform to tune optoelectronic properties via a supramolecular coordination strategy. This study reports on an sp 2 nitrogen heteroatom containing fluorene‐based copolymer namely poly(9,9‐dioctylfluorene‐ co‐ 9,9‐dioctyldiazafluoren‐2,7‐yl) (PF8‐ co ‐DAF8), with ≈20% DAF8 units. Tuning the optoelectronic properties of PF8‐ co ‐DAF8 via supramolecular coordination with a Lewis acid (B(C 6 F 5 ) 3 or AlCl 3 ) is explored. Formation of either the PF8‐ co ‐DAF8‐B(C 6 F 5 ) 3 or PF8‐ co ‐DAF8‐AlCl 3 adducts reduces the optical gap and causes an attendant redshift of the photoluminescence spectra. Controlling the degree and strength of the coordination allows the emission color to be tuned from blue through to green and yellow. This strategy is successfully implemented for polymer light‐emitting diodes, confirming the large degree of spectral tuning whilst maintaining good device performance. Maximum luminous efficiencies, η ≈ 1.55 cd A −1 @ 2120 cd m −2 , 1.32 cd A −1 @ 1424 cd m −2 , and 2.56 cd A −1 @ 910 cd m −2 are, respectively, recorded for the blue‐emitting diodes with Commission Internationale de L'Eclairage (CIE) (x, y) coordinates = (0.16, 0.16), the white‐emitting diodes with CIE (x, y) = (0.28, 0.38) and the green‐emitting diodes with CIE (x, y) = (0.33, 0.52). The results highlight the versatility of the supramolecular coordination strategy in modifying the electronic structure of HCPs.