High-efficiency deep-blue-emitting organic light-emitting diodes based on iridium(III) carbene complexes
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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 two deep‐blue‐emitting homoleptic iridium(III) complexes are reported and OLEDs are demonstrated with CIE coordinates of (0.15, 0.05) and maximum external quantum efficiency of 13.4%, which decreases slightly to 12.5% at 100 cd m−2. They represent examples of the most efficient OLEDs surpassing the CIEy requirement of the National Television System Committee (NTSC) and the European Broadcasting Union (EBU). Emitter orientation contributes to the excellent device performance.
Pal , A K , Krotkus , S , Fontani , M , Mackenzie , C F R , Cordes , D B , Slawin , A M Z , Samuel , I D W & Zysman-Colman , E 2018 , ' High-efficiency deep-blue-emitting organic light-emitting diodes based on iridium(III) carbene complexes ' , Advanced Materials , vol. 30 , no. 50 , 1804231 , pp. 1-10 . https://doi.org/10.1002/adma.201804231
© 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/adma.201804231
DescriptionThe authors are grateful to the University of St Andrews and EPSRC financial support (grants EP/P010482/1 and EP/M02105X/1). A.K.P thanks the Leverhulme Trust Early Career Fellowship (ECF-2017-326). I.D.W.S. acknowledges a Royal Society Wolfson Research Merit award.
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