Effect of Red Emissive Ligand Number on Dendronized Solution‐Processable Iridium (III) Complexes for Organic Light‐Emitting Diodes
Abstract: Tris‐bidentate iridium (III) complexes used in organic light‐emitting diodes (OLEDs) are typically homoleptic or heteroleptic with three or two identical emissive ligands, respectively. Herein red phosphorescence emitting dendrimers composed of first generation biphenyl dendrons, 2‐ethylhexyloxy surface groups and an iridium (III) complex core with three, two or one emissive [4‐phenyl]−2‐[thiophen‐2‐yl]quinoline ligands are reported. The dendrimers have similar photoluminescence quantum yields (PLQYs) in solution (84–88%), neat film (23–25%) and when blended with tris (4‐carbazoyl‐9‐ylphenyl) amine (72–73%), enabling the effect of the number of emissive ligands on OLED performance to be determined. The external quantum efficiency (EQE) of OLEDs composed of neat dendrimer films increased with decreasing number of emissive ligands, with the device composed of the dendrimer having a single emissive ligand having an EQE of 9.2%, which is almost double that expected from a bottom emitting device and a film PLQY of 25 ± 3.6%. The emission is Lambertian and the higher‐than‐expected EQE is ascribed to alignment of the single emissive ligand being optimal for light‐outcoupling. The EQE of OLEDs containing the blend film also increased with decreasing emissive number of ligands (maximum EQE = 15.4%).
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Effect of Red Emissive Ligand Number on Dendronized Solution‐Processable Iridium (III) Complexes for Organic Light‐Emitting Diodes ; day:07 ; month:06 ; year:2024 ; extent:12
Advanced optical materials ; (07.06.2024) (gesamt 12)
- Creator
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Koodalingam, Manikandan
Jang, Junhyuk
Ranasinghe, Chandana Sampath Kumara
Gao, Mile
Burn, Paul L.
Kistemaker, Jos C. M.
Puttock, Emma V.
Shaw, Paul E.
- DOI
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10.1002/adom.202400640
- URN
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urn:nbn:de:101:1-2406071430307.683710406028
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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14.08.2025, 10:57 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Koodalingam, Manikandan
- Jang, Junhyuk
- Ranasinghe, Chandana Sampath Kumara
- Gao, Mile
- Burn, Paul L.
- Kistemaker, Jos C. M.
- Puttock, Emma V.
- Shaw, Paul E.
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