Spatial extent of the recombination zone in a PPV/polymer blend light-emitting diode

✍ Scribed by H. Vestweber; H. Bässler; J. Grüner; R.H. Friend

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 416 KB
• Volume: 256
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00368-5

✦ Synopsis

Double-layer LEDs containing poly(phenylenevinylene) (PPV) and a tris(stilbene)amine (TSA)/polysulfone (PSu) blend as active components were prepared in order to determine the spatial extent of the recombination zone. By monitoring the electroluminescence spectra as a function of the thickness of the TSA layer the fraction of the electrons that reach the PPV layer can be estimated. The electron range s decreases with increasing cell current. For E = 2 × 106 V/cm, s = 55 _ 10 nm is found. Arguments are presented in favor of the notion that s is limited by recombination with majority carders (holes).