Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202000079
Keywords
aggregation induced emission; coordination skeletal deformation; emission mechanism; organic light-emitting devices; phosphorescent Pt(II) complexes
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Funding
- National Natural Science Foundation of China [21602170, 21875179, 51803163, 21572176, 51873176]
- Science, Technology and Innovation Committee of Shenzhen Municipality [JCYJ 20180507183413211]
- Natural Science Foundation of Shaanxi Province [2019JZ-29, 2019JQ-188]
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
- Hong Kong Research Grants Council [PolyU 153062/18P, C6009-17G]
- Hong Kong Polytechnic University [1-ZE1C, 847S]
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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.
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