Enhanced quantum efficiency in blue-emitting polymer/dielectric nanolayer nanocomposite light-emitting devices

✍ Scribed by Jong Hyeok Park; Yong Taik Lim; O Ok Park; Jae-Woong Yu; Jai Kyeong Kim; Young Chul Kim

• Book ID: 103844784
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 271 KB
• Volume: 24
• Category: Article
• ISSN: 0928-4931
• DOI: 10.1016/j.msec.2003.09.039

✦ Synopsis

Light-emitting devices based on environmentally stable, blue-emitting polymer/dielectric nanolayer nanocomposites were fabricated by blending poly(di-octylfluorene) (PDOF) with organo-clay. By reducing the excimer formation that leads to long wavelength tails, the photoluminescence (PL) and electroluminescence (EL) color purity of the device was enhanced. When a conjugated polymer/dielectric nanolayer nanocomposite is applied to an EL device, we expect an electronic structure similar to the well-known quantum well in small nanodomains. The ratio of PDOF/organo-clay was regulated from 2:1 to 0.5:1 (w/w). The light-emitting device of 0.5:1 (w/w) blend demonstrated the highest quantum efficiency (QE), 0.72% (ph/el), which is f 500 times higher value compared with that of the pure PDOF layer device. However, the driving voltage of the nanocomposite devices tended to increase with increasing organo-clay content.