Conjugated Silole and Carbazole Copolymers: Synthesis, Characterization, Single-Layer Light-Emitting Diode, and Field Effect Carrier Mobility

✍ Scribed by Yan Wang; Lintao Hou; Kaixia Yang; Junwu Chen; Feng Wang; Yong Cao

• Book ID: 102487037
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 161 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500281

✦ Synopsis

Abstract

Summary: Soluble conjugated random and alternating copolymers (PCz‐PSP) derived from N‐hexyl‐3,6‐carbazole (Cz) and 1,1‐dimethyl‐2,3,4,5‐tetraphenylsilole (PSP) were synthesized by palladium(0)‐catalyzed Suzuki coupling reactions. The feed ratios of Cz to PSP were 95:5, 90:10, 80:20, 70:30, and 50:50. Chemical structures and optoelectronic properties of the copolymers were characterized by ^1^H NMR, ^13^C NMR, UV absorption, cyclic voltammetry, photoluminescence, electroluminescence, and field effect transistor. HOMO levels of the copolymers are between −5.15 and −5.34 eV. Single‐layer devices with a configuration of ITO/copolymer/Ba/Al were fabricated and the copolymer with PSP content of 20% displayed the highest external quantum efficiency of 0.77%. Field effect transistors with tantalum pentoxide‐polyacrylonitrile double insulators demonstrated that hole mobilities of the copolymers decreased with their PSP contents, and the hole mobility up to 9.3 × 10^−6^ cm^2^ · (V · s)^−1^ could be achieved.

Synthesis of coplymers derived from 3,6‐carbazole and silole.

magnified imageSynthesis of coplymers derived from 3,6‐carbazole and silole.