Probing Electron Excitation Characters of Carboline-Based Bis-Tridentate Ir(III) Complexes

Probing Electron Excitation Characters of Carboline-Based Bis-Tridentate Ir(III) Complexes

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In this work, we report a series of bis-tridentate Ir(III) metal complexes, comprising a dianionic pyrazole-pyridine-phenyl tridentate chelate and a monoanionic chelate bearing a peripheral carbene and carboline coordination fragment that is linked to the central phenyl group.All these Ir(III) complexes were synthesized with peavey kb1 an efficient one-pot and two-step method, and their emission hue was fine-tuned by variation of the substituent at the central coordination entity (i.e.

, pyridinyl and phenyl group) of each of the tridentate chelates.Their photophysical and electrochemical properties, thermal stabilities and nobivac 1-dappv for puppies electroluminescence performances are examined and discussed comprehensively.The doped devices based on [Ir(cbF)(phyz1)] (Cb1) and [Ir(cbB)(phyz1)] (Cb4) give a maximum external quantum efficiency (current efficiency) of 16.

6% (55.2 cd/A) and 13.9% (43.

8 cd/A), respectively.The relatively high electroluminescence efficiencies indicate that bis-tridentate Ir(III) complexes are promising candidates for OLED applications.