Single-layer organic light-emitting diodes using naphthyl diamine

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. https://doi.org/10.1063/1.2740110 and may be found at https://pubs.aip.org/aip/apl/article/90/21/213502/333637/Single-layer-organic-light-emitting-diodes-using.