Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 1, Pages 96-104Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm503361j
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2013CB834805, 2015CB655002]
- National Natural Science Foundation of China [91433201, 61177022, 51225301]
- National Science Fund for Distinguished Young Scholars of China [51125013]
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Two deep-red/near-infrared (NIR) iridium phosphors, (fldpqx)(2)Ir-(acac) and (thdpqx)(2)Ir(acac), were rationally designed and synthesized considering the emission wavelength, emission efficiency, and solubility. In optimized solution-processed phosphorescent polymer light-emitting devices, the (fldpqx)(2)Ir(acac)-based device achieved a maximum external quantum efficiency of 5.7% with the emission peak at 690 nm, while the (thdpqx)(2)Ir(acac)-based device achieved a maximum external quantum efficiency of 3.4% with the emission peak at 702 nm, which are comparable to the highest values ever reported for solution-processable NIR emitters. Moreover, these devices merely experienced low efficiency roll-off at high current densities.
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