The crystal structures and chiral luminescence of three Iridium(III)
complexes with the maximum EQE of 10.7% at 5000 cd/m2
Abstract
In this paper, three Iridium(III) complexes, Ir(dnfppy)2(Cl/Pyrrole),
Ir(dfppy)2(dpp) and Ir(tfmqz)2(sdpp), have been designed and
synthesized. They emitted deep-blue, blue or red photoluminescence with
high quantum yields, for ((Ir(dnfppy)2(Cl/Pyrrole): λmax = 447 nm, F =
62.4%; Ir(dfppy)2(dpp): λmax = 467 nm, F = 25%; Ir(tfmqz)2(sdpp): λmax
= 609 nm, F = 73.7%), respectively. Two pairs of enantiomers of
Ir(dfppy)2(dpp) and Ir(tfmqz)2(sdpp) have been separated by column
chromatography. The maximum external quantum efficiency (EQEmax) of
OLEDs based on Ir(tfmpqz)2(sddp) was 13.8%, showing a relatively low
efficiency roll-off with the EQE of 10.7% at 5000 cd/m2.
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