The Electroluminescence Mechanism of Solution-Processed TADF Emitter 4CzIPN Doped OLEDs Investigated by Transient Measurements

Peng Wang; Suling Zhao; Zheng Xu; Bo Qiao; Zhijuan Long; Qingyu Huang

doi:10.3390/molecules21101365

The Electroluminescence Mechanism of Solution-Processed TADF Emitter 4CzIPN Doped OLEDs Investigated by Transient Measurements

Molecules. 2016 Oct 14;21(10):1365. doi: 10.3390/molecules21101365.

Authors

Peng Wang^{1

2}, Suling Zhao^{3

4}, Zheng Xu^{5

6}, Bo Qiao^{7

8}, Zhijuan Long^{9

10}, Qingyu Huang^{11

12}

Affiliations

¹ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
² Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].
³ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁴ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁵ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁶ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁷ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁸ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].
⁹ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
¹⁰ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].
¹¹ Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China. [email protected].
¹² Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China. [email protected].

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.

Keywords: TADF-based OLEDS; carrier transport and recombination; energy transfer; transient EL.

MeSH terms

Energy Transfer
Lighting / instrumentation*
Luminescence
Luminescent Measurements
Nitriles / chemistry*

Substances

Nitriles
1,3-dicyanobenzene