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Effect of the charge balance on high-efficiency inverted polymer light-emitting diodes.
- Source :
-
Organic Electronics . Oct2017, Vol. 49, p123-128. 6p. - Publication Year :
- 2017
-
Abstract
- In this work, an ultra-thin insulating layer, poly(methylmethacrylate) (PMMA), is incorporated between the emissive layer (EML) and hole transporting layer (HTL) within the inverted polymer light-emitting diodes (PLEDs). Such a structure helps to reduce the hole injection and balance the electrons and holes in the EML. PLEDs with optimal PMMA thickness of around 5.6 nm is observed to obtain a maximum current efficiency of 14.33 cd A −1 , which corresponds to 7.07% improvement compared to that of the device without PMMA layer (13.5 cd A −1 ). The device with best performance exhibits a superior low driving voltage of 2.5 V at 1 cd m −2 and shows a lower efficiency roll-off current efficiency which sustains 85% of the maximum value when the current density reaches 140 mA cm −2 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15661199
- Volume :
- 49
- Database :
- Academic Search Index
- Journal :
- Organic Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 124777574
- Full Text :
- https://doi.org/10.1016/j.orgel.2017.05.028