| 초록 |
Tetradentate Pt(II) complexes are promising emitters for deep blue OLEDs due to their emission energy and high photoluminescence efficiency. However, to obtain a pure blue color, spectral red-shifts, and additional emission peaks at longer wavelengths, originating from strong intermolecular interactions between parallel Pt(II) complexes must be avoided. Herein, a new class of deep-blue emitting Pt(II) complexes consisting of a non-planar ligand and bulky adamantyl group is reported. The six membered metallacycle structure renders the Pt(II) complex non-planar. In addition, adamantyl groups increase intermolecular distances and decrease red-shifts in the emission originating from strong dipole–dipole interactions. OLEDs incorporating these new Pt(II) complexes as emitters exhibit deep blue emission with a Commission International de L’Eclairage (CIE) y under 0.13 and a maximum external quantum efficiency of 22.6%. These results provide a new approach for designing Pt(II) complexes. |
