Single-layer organic light-emitting diodes using naphthyl diamine

S. C. Tse*, K. K. Tsung, S. K. So

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

42 Citations (Scopus)
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N, N′ -diphenyl- N, N′ -bis(1-naphthyl) (1, 1′ -biphenyl)- 4, 4′ diamine (NPB), a common hole transporter, was employed to fabricate single-layer organic light-emitting diodes (OLEDs). With a quasi-Ohmic anode, NPB device exhibited a bulk-limited hole current in the low-voltage region. Electron injection and light emission were clearly observed for applied voltages exceeding 4 V. In order to confine the recombination zone, intentional doping was applied to the single-layer device. After doping with perylene, the luminance and current efficiency of NPB device increased dramatically. It is expected that more efficient single-layer OLEDs can be achieved by using the doping strategy.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in S. C. Tse, K. K. Tsung, S. K. So; Single-layer organic light-emitting diodes using naphthyl diamine. Appl. Phys. Lett. 21 May 2007; 90 (21): 213502. and may be found at

Original languageEnglish
Article number213502
Number of pages3
JournalApplied Physics Letters
Issue number21
Publication statusPublished - May 2007

Scopus Subject Areas

  • Physics and Astronomy (miscellaneous)


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