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A systematic identification of efficiency enrichment between thiazole and benzothiazole based yellow iridium(III) complexes
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Web of Science
Cited 24 time in Scopus
- Authors
- Issue Date
- 2014-11
- Publisher
- Royal Society of Chemistry
- Citation
- Journal of Materials Chemistry C, Vol.2 No.44, pp.9398-9405
- Abstract
- Four cyclometalated heteroleptic Ir(III) complexes [(Et-Cz-BTz)(2)Ir(pic)], [(Et-Cz-BTz)(2)Ir(pic-N-O)], [(Et-Cz-BTz)(2)Ir(EO2-pic)], and [(Et-Cz-BTz)(2)Ir(EO2-pic-N-O)] containing benzothiazole linked ethylcarbazole (Et-Cz-BTz) as a main ligand have been successfully synthesized for solution-processed phosphorescent organic light-emitting diodes (PhOLEDs). All the Ir(III) complexes emit bright yellow (541-582 nm) phosphorescence at room temperature. Among the four Ir(III) complexes, the [(Et-Cz-BTz)(2)Ir(EO2-pic)] showed the best luminous efficiency of 60 cd A(-1) and external quantum efficiency (EQE) of 19% with CIE coordinates (0.467, 0.524), which is one of the best efficiencies for solution-processed yellow PhOLEDs using heteroleptic Ir(III) complexes as an emitting layer. Interestingly, upon replacing the thiazole linking group in the main ligand by benzothiazole, the EQE increased from 6.08 to 19%.
- ISSN
- 2050-7526
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