Three NIR-emitting neutral IrIII complexes [Ir(iqbt)2(dpm)] (1), [Ir(iqbt)2(tta)] (2), and [Ir(iqbt)2(dtdk)] (3) based on the 1-(benzo[b]thiophen-2-yl)-isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6-tetramethyl-3,5-heptanedionate; tta=2-thienoyltrifluoroacetonate; dtdk=1,3-di(thiophen-2-yl)propane-1,3-dionate). The compounds emit between ?=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR-emitting, solution-processed phosphorescent organic light-emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1) with negligible efficiency roll-off values, exceeding the highest reported values for solution-processible NIR emitters.
Near-IR Emitting Iridium(III) Complexes with Heteroaromatic ?-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations
Marta Penconi;Mariacecilia Pasini;Davide Ceresoli;Clara Baldoli;Umberto Giovanella;Alberto Bossi
2016
Abstract
Three NIR-emitting neutral IrIII complexes [Ir(iqbt)2(dpm)] (1), [Ir(iqbt)2(tta)] (2), and [Ir(iqbt)2(dtdk)] (3) based on the 1-(benzo[b]thiophen-2-yl)-isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6-tetramethyl-3,5-heptanedionate; tta=2-thienoyltrifluoroacetonate; dtdk=1,3-di(thiophen-2-yl)propane-1,3-dionate). The compounds emit between ?=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR-emitting, solution-processed phosphorescent organic light-emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1) with negligible efficiency roll-off values, exceeding the highest reported values for solution-processible NIR emitters.File | Dimensione | Formato | |
---|---|---|---|
prod_348140-doc_109919.pdf
solo utenti autorizzati
Descrizione: Near IR
Tipologia:
Versione Editoriale (PDF)
Dimensione
2.32 MB
Formato
Adobe PDF
|
2.32 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
prod_348140-doc_166886.pdf
accesso aperto
Descrizione: Near-IR Emitting Iridium(
Tipologia:
Versione Editoriale (PDF)
Dimensione
1.31 MB
Formato
Adobe PDF
|
1.31 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.