Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 20, Pages 4967-4973Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02326
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Funding
- National Key R&D Program of China [2016YFB0401002]
- National Natural Science Foundation of China [61575146, 91433201]
- National Basic Research Program of China (973 Programs) [2015CB655002]
- Innovative Research Group of Hubei Province [2015CFA014]
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With the aim to achieve highly efficient deep-red emission, we introduced an exciplex forming cohost, 4,4',4 ''-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA): 2,5-bis(2-(9H-carbazol-9-yOphenyl)-1,3,4-oxadiazole (o-CzOXD) (1:1). Due to the efficient triplet up-conversion processes upon the exciplex forming cohost, excellent performances of the devices were achieved with deep-red emission. Using the heteroleptic iridium complexes as the guest dopants, the solution-processed deep-red phosphorescent organic light-emitting diodes (PhOLEDs) with the iridium(III) bis(6-(4-(tert-butyl)phenyl)phenanthridine)acetylacetonate [(TP-BQ)(2)Ir(acac)1-based phosphorescent emitter exhibited an electroluminescent peak at 656 nm and a maximum external quantum efficiency (EQE) of 11.9%, which is 6.6 times that of the device based on the guest emitter doped in the polymer-based cohost. The unique exciplex with a typical hole transporter and a bipolar material is ideal and universal for hosting the red PhOLEDs and tremendously improves the device performances.
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