title: White polymer light-emitting diodes based on star-shaped polymers with an orange dendritic phosphorescent core.
abstract: 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.
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, China.
authors.forename: Minrong
authors.initials: M
authors.lastname: Zhu
authors.forename: Yanhu
authors.initials: Y
authors.lastname: Li
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Cao
authors.forename: Bei
authors.initials: B
authors.lastname: Jiang
authors.forename: Hongbin
authors.initials: H
authors.lastname: Wu
authors.forename: Jingui
authors.initials: J
authors.lastname: Qin
authors.forename: Yong
authors.initials: Y
authors.lastname: Cao
authors.forename: Chuluo
authors.initials: C
authors.lastname: Yang
mesh_terms: D050091:Dendrimers / Q000737:chemistry*; D004581:Electronics; D005449:Fluorenes / Q000737:chemistry; D008027:Light; D049449:Luminescence; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D050091:Dendrimers; D005449:Fluorenes; D011108:Polymers; C041509:fluorene
keywords: phosphorescent dendrimers; star-shaped polymers; white polymer light-emitting diodes