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White Polymer Light‐Emitting Diodes Based on Star‐Shaped Polymers with an Orange Dendritic Phosphorescent Core
Author(s) -
Zhu Minrong,
Li Yanhu,
Cao Xiaosong,
Jiang Bei,
Wu Hongbin,
Qin Jingui,
Cao Yong,
Yang Chuluo
Publication year - 2014
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.201400420
Subject(s) - phosphorescence , materials science , polymer , phosphor , indium tin oxide , oled , electroluminescence , triphenylamine , diode , iridium , pedot:pss , optoelectronics , photochemistry , fluorescence , nanotechnology , chemistry , thin film , optics , layer (electronics) , physics , composite material , organic chemistry , catalysis
A series of new star‐shaped polymers with a triphenylamine‐based iridium(III) dendritic complex as the orange‐emitting core and poly(9,9‐dihexylfluorene) (PFH) chains as the blue‐emitting arms is developed towards white polymer light‐emitting diodes (WPLEDs). By fine‐tuning the content of the orange phosphor, partial energy transfer and charge trapping from the blue backbone to the orange core is realized to achieve white light emission. Single‐layer WPLEDs with the configuration of ITO (indium‐tin oxide)/poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/polymer/CsF/Al exhibit a maximum current efficiency of 1.69 cd A −1 and CIE coordinates of (0.35, 0.33), which is very close to the pure white‐light point of (0.33, 0.33). To the best of our knowledge, this is the first report on star‐shaped white‐emitting single polymers that simultaneously consist of fluorescent and phosphorescent species.