Light-emitting devices based on solid electrolytes and polyelectrolytes

✍ Scribed by Dieter Neher; Johannes Grüner; Vera Cimrová; Wolfgang Schmidt; Rudy Rulkens; Ulrich Lauter

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 842 KB
• Volume: 9
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199807)9:7<461::aid-pat800>3.0.co;2-r

✦ Synopsis

The properties of light-emitting diodes (LEDs) based on organic layers containing mobile ions, so-called lightemitting electrochemical cells (LECs), are reviewed. These devices have some unique properties: their current±voltage characteristics are antisymmetric with respect to the origin and they emit light under both forward and reverse bias. The physical processes involved in the emission from LECs are discussed in terms of a thermodynamic model. Recent work on blends of luminescent and ion-conducting polymers is summarized. In addition, the properties of novel singlecomponent LECs and polyelectrolyte-based devices are presented. The results show that LECs with performances superior to that of conventional LED devices can be fabricated, but questions concerning the transient behavior and degradation mechanisms persist.