| 초록 |
To develop new type of Ir(III) complexes as a blue-phosphorescent dopant in the organic light emitting diode (OLED) devices, we designed C˄C-coordinated N-heterocyclic carbene Ir(III) complex isomers (fac-IrSiPr (f-IrSiPr), mer-IrSiPr (m-IrSiPr) and mer-IrSMe (m-IrSMe), where S = N-dibenzothiophenyl-N-imidazole and superscript iPr and Me indicate isopropyl and methyl groups). The emission spectra of Ir complexes showed the blue phosphorescence at around 450 nm at 300 K and the spectral shift was very small with increasing solvent polarity. Density functional theory (DFT) was employed to understand the molecular structure, the energy level, and the orbital distribution. The OLEDs devices were manufactured using m-IrSiPr and m-IrSMe as a dopant. The OLED devices showed the blue electroluminescence, which was investigated in terms of the current density-voltage-luminance (J-V-L), the current efficiency, the power efficiency, and the external quantum efficiency |
