کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5435419 | 1509351 | 2017 | 8 صفحه PDF | دانلود رایگان |
- A novel heteroleptic iridium complex (Ir-F19), with highly fluorinated organic ligands, is synthesized.
- Ir-F19 shows blue-green photoluminescence, with emission peaks at 480 and 512Â nm and 68% quantum yield.
- Ir-F19 is suitable as blue-green emitting component for bilayer stacked WOLEDs.
- Good WOLED performances are observed (CRI 76, current efficiency 10.5Â cd/A at 100Â cd/m2).
A novel perfluorinated heteroleptic iridium complex, namely iridium(III)bis[2-(2,5,2â²,3â²,4â²,5â²,6â²-heptafluoro-biphenyl-4-yl)-pyridinato-N,C2â²][3-(pentafluorophenyl)-pyridin-2-yl-1,2,4-triazolate] (Ir-F19), has been synthesized and characterized both in solution and in the solid state. The compound displays blue-green photoluminescence, with emission peaks at 480 and 512Â nm and 68% quantum yield, in degassed acetonitrile solution. The use of this phosphor in blue and white organic light emitting devices (WOLEDs) has been investigated. Current efficiency of 8.3Â cd/A at 100Â cd/m2 has been recorded for the blue emitting device whereas white electroluminescence with good color rendering index (CRIÂ =Â 76) and CIE coordinates (0.43, 0.42) have been observed for a WOLED made of two stacked layers based on Ir-F19 and the commercial orange Ir(MDQ)2(acac) [bis(2-methyldibenzo[f,h]quinoxaline)(acetylacetonate)iridium(III)]. WOLED luminous efficiency of 10.5Â cd/A at 100Â cd/m2, almost constant (10.1Â cd/A) up to 1000Â cd/m2, indicates that Ir-F19 is a promising blue-green emitting component for white electroluminescence.
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Journal: Synthetic Metals - Volume 227, May 2017, Pages 148-155