Stable and efficient solid-state light-emitting electrochemical cells based on a series of hydrophobic iridium complexes

Rubén D. Costa, Enrique Ortí, Daniel Tordera, Antonio Pertegás, Henk J. Bolink, Stefan Graber, Catherine E. Housecroft, Ludmila Sachno, Markus Neuburger, Edwin C. Constable

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

Light-emitting electrochemical cells (LECs) based on ionic transition-metal complexes (iTMCs) exhibiting high efficiency, short turn-on time, and long stability have recently been presented. Furthermore, LECs emitting in the full range of the visible spectrum including white light have been reported. However, all these achievements were obtained individually, not simultaneously, using in each case a different iTMC. In this work, device stability is maintained by employing intrinsically stable ionic iridium complexes, while increasing the complex and the device quantum yields for exciton-to-photon conversion. This is done by sequentially modifying the archetype ionic iridium complex [Ir(ppy) 2(bpy)][PF 6], where Hppy is 2-phenylpyridine and bpy is 2,2'-bipyridine, with methyl and phenyl groups on the bpy ligand. A full photophysical and theoretical description of a series of four complexes, including the archetype as a reference, is presented and their performance in LECs is characterized. Upon selecting suitable substituents, a twofold increase is obtained in the photoluminescence quantum yield in a solid film. This is reflected in a significant increase in the efficiency over time curve for LECs using this complex.

Original languageEnglish
Pages (from-to)282-290
Number of pages9
JournalAdvanced Energy Materials
Volume1
Issue number2
DOIs
Publication statusPublished - 2011 Mar 18

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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