Abstract
Aggregation-induced emission (AIE)-active phosphorescent emitters have intrinsic advantages in time-gated imaging/sensing and improving the electroluminescent efficiencies of organic light-emitting devices (OLEDs). However, compared with the very prosperous and fruitful developments of AIE-active fluorescent emitters and related working mechanisms, the progresses on AIE-active phosphorescent emitters and associated AIE mechanisms are still relatively slow. Herein, the AIE properties of a series of phosphorescent Pt(II) complexes with two monodentate ligands are reported. Compared with the conventional rigid Pt(II) complexes bearing two bidentate ligands or one tri-/tetradentate ligand, the incorporation of two monodentate ligands provides the resulting Pt(II) complexes with more room to deform their coordination skeletons from the square-planar geometry in the ground state to the quasi-tetrahedral configuration in the excited state, causing poor solution emissions. In doped films and aggregate states, intense emissions are observed for these Pt(II) complexes. The as-fabricated solution-processed OLED exhibits an impressively high external quantum efficiency of 21.7%. This study provides an effective way to develop excellent AIE-active phosphorescent emitters.
Original language | English |
---|---|
Article number | 2000079 |
Journal | Advanced Optical Materials |
Volume | 8 |
Issue number | 13 |
DOIs | |
Publication status | Published - 6 Jul 2020 |
Keywords
- aggregation induced emission
- coordination skeletal deformation
- emission mechanism
- organic light-emitting devices
- phosphorescent Pt(II) complexes
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics