6533b838fe1ef96bd12a3bc1
RESEARCH PRODUCT
An inconvenient influence of iridium(III) isomer on OLED efficiency.
Filippo De AngelisMichael GrätzelMd. K. NazeeruddinSimona FantacciSimona FantacciDavide Di CensoEtienne BaranoffHenk J. BolinkKarim Djellabsubject
Thermogravimetric analysisInjectionMaterials scienceLightchemistry.chemical_elementTransportElectrochemistryPhotochemistryIridiumlaw.inventionPhosphorescent OledsInorganic ChemistryIsomerismComplexeslawOLEDElectrochemistryOrganometallic CompoundsDevicesIridiumDopantMolecular StructureConversionTime-dependent density functional theorychemistryElectrochemistry; Iridium; Isomerism; Molecular Structure; Organometallic Compounds; Light; Quantum TheoryGreenQuantum TheoryBipolar HostIsomerizationLight-emitting diodeLight-Emitting-Diodesdescription
The recently reported heteroleptic cyclometallated iridium(III) complex [Ir(2-phenylpyridine)(2)(2-carboxy-4-dimethylaminopyridine)] N984 and its isomer N984b have been studied more in detail. While photo- and electrochemical properties are very similar, DFT/TDDFT calculations show that the two isomers have different HOMO orbital characteristics. As a consequence, solution processed OLEDs made using a mixture of N984 and isomer N984b similar to vacuum processed devices show that the isomer has a dramatic detrimental effect on the performances of the device. In addition, commonly used thermogravimetric analysis is not suitable for showing the isomerization process. The isomer could impact performances of vacuum processed OLEDs using heteroleptic cyclometallated iridium(III) complexes as dopant.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-08-18 |