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.
Low driving voltage simplified tandem organic light-emitting devices by using exciplex-forming hosts
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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