title: The Electroluminescence Mechanism of Solution-Processed TADF Emitter 4CzIPN Doped OLEDs Investigated by Transient Measurements.
abstract: High efficiency, solution-processed, organic light emitting devices (OLEDs), using a thermally-activated delayed fluorescent (TADF) emitter, 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), are fabricated, and the transient electroluminescence (EL) decay of the device with a structure of [ITO/PEDOT: PSS/4CzIPN 5 wt % doped 4,40-N,N0-dicarbazolylbiphenyl(CBP)/bis-4,6-(3,5-di-4-pyridylphenyl)-2-methylpyrimidine (B4PyMPM)/lithium fluoride (LiF)/Al], is systematically studied. The results shed light on the dominant operating mechanism in TADF-based OLEDs. Electroluminescence in the host-guest system is mainly produced from the 4CzIPN emitter, rather than the exciplex host materials.
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. 15118435@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. 15118435@bjtu.edu.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. slzhao@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. slzhao@bjtu.edu.cn.
authors.forename: Suling
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. zhengxu@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. zhengxu@bjtu.edu.cn.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. boqiao@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. boqiao@bjtu.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Qiao
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. 13121561@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. 13121561@bjtu.edu.cn.
authors.forename: Zhijuan
authors.initials: Z
authors.lastname: Long
authors.affiliation: Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. 12118413@bjtu.edu.cn.|Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. 12118413@bjtu.edu.cn.
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Huang
mesh_terms: D004735:Energy Transfer; D008029:Lighting / Q000295:instrumentation*; D049449:Luminescence; D008163:Luminescent Measurements; D009570:Nitriles / Q000737:chemistry*
chemical_list: D009570:Nitriles; C412619:1,3-dicyanobenzene
keywords: TADF-based OLEDS; carrier transport and recombination; energy transfer; transient EL