Tandem organic light-emitting devices (OLEDs), i.e., OLEDs containing multiple electroluminescence (EL) units that are vertically stacked, are attracting significant interest because of their ability to realize high current efficiency and long operational lifetime. However, stacking multiple EL units in tandem OLEDs increases driving voltage and complicates fabrication process relative to their standard single unit counterparts. In this paper, we demonstrate low driving voltage tandem OLEDs via utilizing exciplex-forming hosts in the EL units instead of conventional host materials. The use of exciplex-forming hosts reduces the charge injection barriers and the trapping of charges on guest molecules, resulting in the lower driving voltage. The use of exciplex-forming hosts also allows using fewer layers, hence simpler EL configuration which is beneficial for reducing the fabrication complexity of tandem OLEDs.
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13 October 2014
Research Article|
October 13 2014
Low driving voltage simplified tandem organic light-emitting devices by using exciplex-forming hosts
Dong-Ying Zhou;
Dong-Ying Zhou
1Department of Electrical and Computer Engineering and Waterloo Institute for Nanotechnology,
University of Waterloo
, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
2Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou, Jiangsu 215123, China
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Lin-Song Cui;
Lin-Song Cui
2Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou, Jiangsu 215123, China
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Ying-Jie Zhang;
Ying-Jie Zhang
1Department of Electrical and Computer Engineering and Waterloo Institute for Nanotechnology,
University of Waterloo
, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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Liang-Sheng Liao;
Liang-Sheng Liao
a)
2Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou, Jiangsu 215123, China
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a)
Authors to whom correspondence should be addressed. Electronic addresses: lsliao@suda.edu.cn and h2aziz@uwaterloo.ca.
Appl. Phys. Lett. 105, 153302 (2014)
Article history
Received:
September 03 2014
Accepted:
September 30 2014
Citation
Dong-Ying Zhou, Lin-Song Cui, Ying-Jie Zhang, Liang-Sheng Liao, Hany Aziz; Low driving voltage simplified tandem organic light-emitting devices by using exciplex-forming hosts. Appl. Phys. Lett. 13 October 2014; 105 (15): 153302. https://doi.org/10.1063/1.4897994
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