High performance blue light-emitting diodes based on conjugated polymer blends

L. C. Paillis, D. G. Lidzey, M. Redecker, D. D.C. Bradley, M. Inbasekaran, E. P. Woo, W. W. Wu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We report on the fabrication and properties of single layer blue light-emitting diodes (LEDs) based on conjugated polymer blends of emissive and hole transport materials. Despite the fact that the photoluminescence quantum efficiency of the blend is lower compared to that of both the host and the guest polymers, an enhancement in both the electroluminescence quantum and power efficiency is seen for the blend. This observation indicates that the hole transporting material leads to a significantly improved hole injection and thus a greatly improved charge carrier balance factor. Optimised single layer blue LEDs showed a maximum brightness of 6000 Cd/m 2 at 14 V and a maximum external ELQE of 1% (2.1 Cd/A) at 15 Cd/m 2 corresponding to a power efficiency of 1 lm/WL).
Original languageEnglish (US)
JournalSynthetic Metals
Volume121
Issue number1-3
DOIs
StatePublished - Mar 15 2001
Externally publishedYes

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