Acetylated Phenylpyridine Derived Iridium (III) Complexes for Orange-Red Electrophosphorescent Light-Emitting Diodes

초록

The photophysical characteristics of (Actpy)(2)Ir(acac) and (Acpsf)(2)Ir(acac) were investigated to determine their suitability as candidates for red light-emitting materials for organic light emitting diodes (OLEDs) [where Actpy = 3-acetyl-6-(4-tert-butylphenyl)pyridine, acac = acetoylacetonate, and Acpsf = 3-acetyl-6-(9,9'-spirobi[fluorene]-2-yl)pyridine]. To explore the electroluminescent properties of these materials, multilayered OLEDs were fabricated the device structure of ITO/NPB/CBP: 8% Ir(III) complexes/BCP/Alq(3)/Liq/Al. Particularly, device 1 using complex (Actpy)(2)Ir(acac) as a dopant material furnished a maximum luminance of 41,800 cdm (2) at 15 V, and luminous efficiency and power efficiency of 5.70 cdA (1) and 2.70 lmW(-1) at 20 mAcm(-2), respectively. Additionally, this device showed orange-red emission with CIE coordinates of (0.57, 0.42) at 10.0 V.

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