Abstract
Three neutral Pt(II) complexes (Pt1-Pt3) containing diazafluorene derivative ligands have been designed and synthesized. Single-crystal diffractions analysis of complex Pt2 revealed that there are strong Pt-Pt interactions in crystal phase. All these complexes exhibited AIE properties. Moreover, the luminescence spectra of these complexes change significantly with the change of their aggregation state. From complexes Pt1 to Pt3, their PL QYs in neat films increases from 0.7% to 34.6%, indicating the important role of steric groups in reducing concentration quenching. For non-doped OLEDs, complex Pt3 was markedly superior to complex Pt2 with the emission peak at 608 nm, maximum CE of 8.0 cd A-1, maximum EQE of 2.4% and maximum luminance of 2229 cd m−2, attributed to the charge-carries transporting capability of ECAF ligand. Complex Pt3 exhibited medium performance in doped OLEDs with a maximum CE of 16.0 cd A-1, a maximum EQE of 7.4%, a maximum luminance of 15409 cd m−2 and low efficiency roll-off. These studies clearly illustrate that regulating the steric hindrance and carrier transport properties of ligands plays an important role in improving the electroluminescent properties of Pt(II) complexes.
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