Abstract
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.
Original language | English |
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Article number | 213502 |
Journal | Applied Physics Letters |
Volume | 90 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2007 |
Scopus Subject Areas
- Physics and Astronomy (miscellaneous)