Tuning of emission color for blue dendrimer blend light-emitting diodes

J P J Markham, E B Namdas, T D Anthopoulos, I D W Samuel, G J Richards, P L Burn

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

We demonstrate efficient tunable blue electroluminescence from blends of two solution-processible light-emitting dendrimers. These materials can be blended to form optical quality thin films with no phase-separation effects, irrespective of the blend ratio. External quantum efficiencies of 1% have been measured for the blend systems and the emission color can be tuned from deep blue (emission peak 401 nm) to blue green (477 nm) by blend composition. A power efficiency of 1.5 lm/W (at 200 Cd/m(2) and 5.4 V) is measured for a single layer, first-generation blue-green fluorene-thiophene dendrimer. These results show that by choice of a dendrimer structure with common branching units and surface groups, dissimilar cores can be blended with excellent miscibility. This provides a simple way of tuning the color of organic light-emitting diodes. (C) 2004 American Institute of Physics.

Original languageEnglish
Pages (from-to)1463-1465
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number9
DOIs
Publication statusPublished - 30 Aug 2004

Keywords

  • LAYER
  • POLYMERS

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