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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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Cao et al. (2014) studied this question.
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