title: Highly Improved Efficiency of Deep-Blue Fluorescent Polymer Light-Emitting Device Based on a Novel Hole Interface Modifier with 1,3,5-Triazine Core.
abstract: We present an investigation of deep-blue fluorescent polymer light-emitting diodes (PLEDs) with a novel functional 1,3,5-triazine core material (HQTZ) sandwiched between poly(3,4-ethylene dioxythiophene):poly(styrene sulfonic acid) layer and poly(vinylcarbazole) layer as a hole injection layer (HIL) without interface intermixing. Ultraviolet photoemission spectroscopy and Kelvin probe measurements were carried out to determine the change of anode work function influenced by the HQTZ modifier. The thin HQTZ layer can efficiently maximize the charge injection from anode to blue emitter and simultaneously enhance the hole mobility of HILs. The deep-blue device performance is remarkably improved with the maximum luminous efficiency of 4.50 cd/A enhanced by 80% and the maximum quantum efficiency of 4.93%, which is 1.8-fold higher than that of the conventional device without HQTZ layer, including a lower turn-on voltage of 3.7 V and comparable Commission Internationale de L'Eclairage coordinates of (0.16, 0.09). It is the highest efficiency ever reported to date for solution-processed deep-blue PLEDs based on the device structure of ITO/HILs/poly(9,9-dialkoxyphenyl-2,7-silafluorene)/CsF/AL. The results indicate that HQTZ based on 1,3,5-triazine core can be a promising candidate of interfacial materials for deep-blue fluorescent PLEDs.
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Lianpeng
authors.initials: L
authors.lastname: Xia
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.|School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Xue
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Kang
authors.initials: K
authors.lastname: Xiong
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Chaosheng
authors.initials: C
authors.lastname: Cai
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Zuosheng
authors.initials: Z
authors.lastname: Peng
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Jingsheng
authors.initials: J
authors.lastname: Miao
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Dongcheng
authors.initials: D
authors.lastname: Chen
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Zhanhao
authors.initials: Z
authors.lastname: Hu
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Jianbin
authors.initials: J
authors.lastname: Wang
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Peng
authors.affiliation: Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, P.R. China.
authors.forename: Yueqi
authors.initials: Y
authors.lastname: Mo
authors.affiliation: Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Lintao
authors.initials: L
authors.lastname: Hou
keywords: 1,3,5-triazine core; charge balance; deep-blue; fluorescent polymer light-emitting diodes; hole injection layer