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Homoleptic purine-based NHC iridium( iii ) complexes for blue OLED application: impact of isomerism on photophysical properties

dc.contributor.authorSEBRIS, Armands
dc.contributor.authorGUZAUSKAS, Matas
dc.contributor.authorMAHMOUDI, Malek
dc.contributor.authorVOLYNIUK, Dmytro
dc.contributor.authorGRAZULEVICIUS, Juozas
dc.contributor.authorMISHNEV, Anatoly
dc.contributor.authorNOVOSJOLOVA, Irina
dc.contributor.authorTURKS, Māris
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorJONUSAUSKAS, Gediminas
dc.contributor.authorTRASKOVSKIS, Kaspars
dc.date.accessioned2024-03-18T03:08:37Z
dc.date.available2024-03-18T03:08:37Z
dc.date.issued2023
dc.identifier.issn2050-7526
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188820
dc.description.abstractEnWith a motivation to develop deep-blue emitters for organic light-emitting diodes (OLEDs) stereoisomers of a homoleptic N-heterocyclic carbene (NHC) iridium(III) complex bearing 7,9-dihydro-8Hpurin-8-ylidene ligands (mer-PhP and fac-PhP) have been synthesized and their photophysical, electrical and electroluminescent properties investigated. The studied complexes only transport holes with the highest hole mobility value of 2 10ÿ4 cm2 Vÿ1 sÿ1 at an electric field of 4.9 105 V cmÿ1 in the case of fac-PhP. When molecularly dispersed in PMMA films, the compounds show bright blue phosphorescence (466 and 437 nm) with photoluminescence quantum yield (FPL) values of 0.99 and 0.77. The complexes also possess exceptional thermal stability with a 5% mass loss point at up to 480 1C. While the mer-isomer shows more efficient photoluminescence and a twofold higher radiative rate, it is more sensitive to external stimulus: its FPL significantly drops and an emission redshift takes place upon transfer from a rigid to liquid surrounding medium or under exposure to a temperature increase. DFT calculations relate this effect to a weakened metal–ligand bonding at the lowest energy excited triplet state (T1) of the compound, which promotes the extent of non-radiative relaxation processes. On the basis of mer-PhP an efficient blue OLED was prepared with an emission maximum wavelength of 467 nm and a maximum external quantum efficiency of 16.1%.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enHomoleptic purine-based NHC iridium( iii ) complexes for blue OLED application: impact of isomerism on photophysical properties
dc.typeArticle de revue
dc.identifier.doi10.1039/d3tc02681g
dc.subject.halChimie
dc.subject.halPhysique [physics]
bordeaux.journalJournal of Materials Chemistry C
bordeaux.page14608-14620
bordeaux.volume11
bordeaux.hal.laboratoriesLaboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798*
bordeaux.issue42
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-04306615
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04306615v1
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