Strong red emission in heterojunctions of conjugated polymer blends

Zong Long Li, Hsin-Fei Meng*, Sheng Fu Horng, Chain-Shu Hsu, Lai Cheng Chen, Shu Mei Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

15 Scopus citations


A strong red emission in bilayer polymer light emitting diodes made of poly(3-hexylthiophene)(P3HT) and polyfluorene copolymers was discussed. It was shown that the spectrum of the diode, peaked at 612 nm, was attributed to the exciplex state existed only at the heterojunction. The peak luminance of 3500 cd/m2 with yield 1.3 cd/A was achieved and the efficiency of the junction emission was found to be very high for red polymer light-emitting diodes. It was suggested that by blending red-emitting polymers into polyfluorene to eliminate the small residual green emission, the emission color could be made more saturated.

Original languageEnglish
Pages (from-to)4944-4946
Number of pages3
JournalApplied Physics Letters
Issue number24
StatePublished - 14 Jun 2004

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