Organic light emitting diodes using NaCl: N, N′-bis(naphthalene-1-yl) -N, N′-bis(phenyl)benzidine composite as a hole injection buffer layer

Jeongho Kim, Myungseop Kim, Jeong Won Kim, Yeonjin Yi, Heon Kang

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8 Citations (Scopus)

Abstract

Composite buffer layers of N, N′ -bis(naphthalene-1-yl)- N, N′ -bis(phenyl)benzidine (NPB) and NaCl at the anode/organic interface were found to be very effective on the hole injection enhancement from an indium tin oxide anode to the hole-transport layer (HTL) of NPB. Two maxima of significant current injection with respect to compositional variation were observed, implying multiple injection mechanisms of the tunneling effect and other interfacial effects. From a longer operation lifetime, the enhanced device stability was also confirmed as compared with a standard device with copper phthalocyanine as the hole injection layer. Those results are partly attributed to the better mechanical contact between anode and HTL via the composite buffer, observed from atomic force microscopy measurement.

Original languageEnglish
Article number103703
JournalJournal of Applied Physics
Volume108
Issue number10
DOIs
Publication statusPublished - 2010 Nov 15

Bibliographical note

Funding Information:
The authors would like to thank Mr. Sangkyoon Kim for helping us fabricate the OLED devices and measure their electrical properties. This work is partially supported by National Research Foundation (Grant No. 2010-0023310).

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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