TY - JOUR
T1 - A novel white-light-emitting conjugated polymer derived from polyfluorene with a hyperbranched structure
AU - Sun, Jing
AU - Yang, Junli
AU - Zhang, Chongyang
AU - Wang, Hua
AU - Li, Jie
AU - Su, Shijian
AU - Xu, Huixia
AU - Zhang, Tiaomei
AU - Wu, Yuling
AU - WONG, Wai Yeung
AU - Xu, Bingshe
N1 - This work was financially supported by Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-13-0927); International Science & Technology Cooperation Program of China (2012DFR50460); National Natural Scientific Foundation of China (61205179, 61307030, 61307029); Shanxi
Provincial Key Innovative Research Team in Science and Technology (2012041011).
PY - 2015/7/1
Y1 - 2015/7/1
N2 - A series of novel hyperbranched conjugated polymers containing red phosphorescent iridium complexes that produce white-light emission have been designed and synthesized. The iridium complexes, tris[1-phenylisoquinolinato-C2,N]iridium(iii) (Ir(piq)3), as red emitters, are covalently connected with the polyfluorene segments as blue emitters. Based on the hyperbranched structure, the conjugated polymers with large steric hindrance can effectively suppress the triplet-triplet annihilation. Simultaneously, the synthesized polymers express relatively better thermostability, photophysical properties, with a higher fluorescence quantum yield (57-77%), and electrochemical properties. By incorporating about 0.1 mol% of Ir(piq)3 into the conjugated polymers, the white-light emission could be achieved. Single-active-layer polymer light emitting devices with the configuration of ITO/PEDOT:PSS/polymer/TPBI/LiF/Al have been fabricated. Among all the devices, PF-Ir(piq)3100 device exhibits a Commission Internationale de l'Eclairage coordinate of (0.30, 0.23), which is close to that of pure white light. This indicates that the hyperbranched polymers exhibiting mixed fluorescence and phosphorescence emission would be promising white-light materials.
AB - A series of novel hyperbranched conjugated polymers containing red phosphorescent iridium complexes that produce white-light emission have been designed and synthesized. The iridium complexes, tris[1-phenylisoquinolinato-C2,N]iridium(iii) (Ir(piq)3), as red emitters, are covalently connected with the polyfluorene segments as blue emitters. Based on the hyperbranched structure, the conjugated polymers with large steric hindrance can effectively suppress the triplet-triplet annihilation. Simultaneously, the synthesized polymers express relatively better thermostability, photophysical properties, with a higher fluorescence quantum yield (57-77%), and electrochemical properties. By incorporating about 0.1 mol% of Ir(piq)3 into the conjugated polymers, the white-light emission could be achieved. Single-active-layer polymer light emitting devices with the configuration of ITO/PEDOT:PSS/polymer/TPBI/LiF/Al have been fabricated. Among all the devices, PF-Ir(piq)3100 device exhibits a Commission Internationale de l'Eclairage coordinate of (0.30, 0.23), which is close to that of pure white light. This indicates that the hyperbranched polymers exhibiting mixed fluorescence and phosphorescence emission would be promising white-light materials.
UR - http://www.scopus.com/inward/record.url?scp=84933565451&partnerID=8YFLogxK
U2 - 10.1039/c5nj00289c
DO - 10.1039/c5nj00289c
M3 - Journal article
AN - SCOPUS:84933565451
SN - 1144-0546
VL - 39
SP - 5180
EP - 5188
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 7
ER -