Probing space charge effect on electroluminescence of indium tin oxide (ITO)/N,N′-di-[(1-naphthyl)-N,N′-diphenyl]-(1,1′-biphenyl)-4, 4′-diamine (α-NPD)/tris(8-hydroxy-quinolinato) aluminum (III) (Alq3)/Al diodes by time-resolved electric-field-induced optical second-harmonic generation measurement
| Autor: | Mitsumasa Iwamoto, Atsuo Sadakata, Kenshiro Osada, Dai Taguchi, Takaaki Manaka |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Metals and Alloys Analytical chemistry Second-harmonic generation Surfaces and Interfaces Electroluminescence Space charge Surfaces Coatings and Films Electronic Optical and Magnetic Materials Indium tin oxide law.invention chemistry.chemical_compound chemistry law Diamine Materials Chemistry OLED Luminescence Light-emitting diode |
| Zdroj: | Thin Solid Films. 554:110-113 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2013.08.015 |
| Popis: | By using time-resolved electric-field-induced optical second-harmonic generation measurement, we studied the electroluminescence (EL) mechanism which is activated in double-layer organic light-emitting diodes (indium tin oxide/ N , N ′-di-[(1-naphthyl)- N , N ′-diphenyl]-(1,1′-biphenyl)-4,4′-diamine ( α -NPD)/tris(8-hydroxy-quinolinato) aluminum (III) (Alq 3 )/Al) in the high frequency region with application of AC square voltages at various duty-ratios. Results showed that holes were accumulated at the α -NPD/Alq 3 interface in proportion to the duty-ratio, and corresponded well to the increasing EL enhancement at the high frequency. Our previous proposed model on the EL enhancement assisted by electron injection from the Al electrode in the presence of the space charge field was well confirmed. |
| Databáze: | OpenAIRE |
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