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Highly Efficient Blue LECs Using Charged Iridium Complexes

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Wongkhan K., Mahanitipong U., Srikaew M., Tantirunggrotchai Y., Sahasithiwat S., Jitchati R.

Acta Physica Polonica A

2015

vol. 127

issue 4

1109-1111

Two heteroleptic charged iridium (III) species comprising two cyclometallating ligands and a neutral diimine ligand were synthesized and characterized, namely [(3,4,7,8-tetramethyl-1,10-phenanthroline-N-N')-bis-(2-(2,4-difluorophenyl)-5-(trifluoromethyl)pyridine-C^{6'},N)-iridium (III)]hexafluorophosphate (UM01) and [(3,4,7,8-tetramethyl-1,10-phenanthroline-N-N')-bis-(2-(2',4'-difluoro-phenyl)-1H-pyrazole-C^{6'},N)-iridium (III)]hexafluorophosphate (UM02). Both complexes were used as the blue emitter in OLED and LEC devices. We found that the optimized structure is ITO/PEDOT:PSS/complex:BMIMPF₆(1:1)/Al. The UM01 gave a current efficiency of 1.14 cd A^{-1}, whereas the UM02 shows a better CIE coordination at 0.19, 0.40.

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1 Acta Physica Polonica A

1 2015

1 Jitchati R.

1 Mahanitipong U.

1 Sahasithiwat S.

1 Srikaew M.

1 Tantirunggrotchai Y.

1 Wongkhan K.

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Highly Efficient Blue LECs Using Charged Iridium Complexes