Green Emitting PLED Having Polymeric Host and Dopant in Emissive Layer

Abstract

Poly(1,1′-biphenyl-4,4′-ylene vinylene-alt-2,5-bis(2-ethylhexyl)-1,4-phenylene vinylene] [poly(BPV-alt-BEHPV)] as a polymeric dopant, was synthesized by Honer-Emmons condensation from corresponding dialdehyde and diphosphonate monomers. Synthesized alternating polymer was used to fabricate single layer (ITO/Host:Dopant/Al) PLEDs with poly(vinyl carbazole) (PVK) as a host. Conjugated poly(BPV-alt-BEHPV) showed green emission from single layer ITO/poly(BPV-alt-BEHPV)/Al device. Emission colors from doped PLEDs were changed by energy transfer from blue originated from PVK to green with increasing the content of poly(BPV-alt-BEHPV).

Keywords:

• energy transfer
• polymeric dopant
• polymeric host
• polymer light emitting diode (PLED)

Acknowledgments

This work was supported by the DGIST Basic Research Program of the MOST, and the Regional Innovation Center (ADMRC) Program of the Ministry of Commerce, Industry, and Energy of Korea.

Notes

^a onset point of UV-visible absorption spectrum.

^b λ_max,PL − λ_max,UV.