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Issue 22, 2017
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High efficiency yellow organic light-emitting diodes with a solution-process feasible iridium based emitter

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Abstract

Yellow emission plays an important role in many display and lighting applications, such as RGBY display or blue hazard free lighting sources, while a wet-process enables soft devices to be manufactured cost-effectively. We demonstrate here that high efficiency yellow organic light-emitting diodes can be made with an innovative solution-process viable iridium based material, bis[5-methyl-7-fluoro-8-trifluoromethyl-5H-benzo(c)(1,5)naphthyridin-6-one]iridium(picolinate) (FCF3BNO). The device exhibits a power efficacy of 49.2 lm W−1 at 1000 cd m−2 with an external quantum efficiency of 22.7% with a spin-coated emissive layer. A National Television Standards Committee (NTSC) color saturation of 110% is achievable by employing the yellow emission along with the standard RGB. The high efficiency may be attributed to the electron-withdrawing F and CF3 substitutions in the emitter to prevent self-quenching from dense packing. We also found that high efficiency can be achieved for wet-processed devices simply by balancing the injected holes and electrons with the help of energy-level matching hosts. The resultant RGBY composed of pure white light is 8% more friendly than the typical RGB counterpart from a retina protection perspective and also 8% better with respect to melatonin secretion.

Graphical abstract: High efficiency yellow organic light-emitting diodes with a solution-process feasible iridium based emitter

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Article information


Submitted
08 Apr 2017
Accepted
07 May 2017
First published
10 May 2017

J. Mater. Chem. C, 2017,5, 5478-5486
Article type
Paper

High efficiency yellow organic light-emitting diodes with a solution-process feasible iridium based emitter

J. Jou, S. Fu, C. An, J. Shyue, C. Chin and Z. He, J. Mater. Chem. C, 2017, 5, 5478
DOI: 10.1039/C7TC01516J

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