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

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 unit...

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Bibliographic Details
Published inApplied physics letters Vol. 105; no. 15
Main Authors Zhou, Dong-Ying, Cui, Lin-Song, Zhang, Ying-Jie, Liao, Liang-Sheng, Aziz, Hany
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 13.10.2014
Subjects
Applied physics
Charge injection
Current efficiency
Devices
Diodes
Electric potential
Electroluminescence
Organic light emitting diodes
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Summary: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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content type line 14
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4897994