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High efficiency deep blue-emitting organic light emitting diodes based on iridium(III) carbene complexes

Research output: Contribution to journalArticle

Abstract

High-efficiency pure blue phosphorescent organic light emitting diodes (OLEDs) remain one of the grand challenges principally because the emissive complexes employed either do not possess sufficiently high photoluminescence quantum yields or exhibit unsatisfactory Commission International de L’Éclairage (CIE) coordinates. Here we report two deep-blue emitting homoleptic iridium(III) complexes and demonstrate OLEDs with CIE coordinates of (0.15, 0.05) and the maximum external quantum efficiency of 13.4%, which decrease slightly to 12.5% at 100 cd m-2, which represent examples of the most efficient OLEDs surpassing the CIEy requirement of the National Television System Committee (NTSC) and satisfy the most stringent blue standard for displays defined by the European Broadcasting Union (EBU). The excellent device performance is accounted for by considering the mechanism by which the emitter orients itself in the vacuum deposited film.
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Details

Original languageEnglish
Article number1804231
JournalAdvanced Materials
Volume30
Issue number50
Early online date15 Oct 2018
DOIs
Publication statusPublished - 13 Dec 2018

    Research areas

  • Deep-blue emission, Iridium emitters, NHC ligands, Organic light-emitting diodes

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