Abstract
We report on the fabrication and properties of single layer green light-emitting diodes (LEDs) based on fluorene-containing conjugated polymers and associated blends. We have used a new green fluorene based conjugated polymer (namely 5BTF8) as the emissive material as well as the host in blends with a guest hole transport triarylamine/fluorene copolymer (namely BFB) to fabricate bright and efficient single layer green polymer light-emitting diodes (PLEDs). An enhancement in both the electroluminescence quantum and power efficiency is seen for the blend. This observation indicates that the hole transport material leads to a significant improvement in hole injection and transport and thus to an improved charge carrier balance factor. A higher brightness and a lower turn-on as well as operating voltage are also achieved for the blend. (Author)