Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 33, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202211853
Keywords
deep-red; near-IR; organic light-emitting diodes; phosphorescence; Pt(II) emitters; Pt; Pt interactions; pyridazine; pyrimidine
Ask authors/readers for more resources
In this study, phenylpyridazine-based bidentate ligands were synthesized and used for the preparation of dinuclear Pt(II) complexes. The complexes exhibited intense emissions in the NIR region, high photoluminescence quantum yields, and short phosphorescence decay lifetimes. The functional groups or atoms in the ligands played crucial roles in the formation of emitters with significantly shortened Pt center dot center dot center dot Pt distances. The resulting non-doped NIR OLEDs showed good electroluminescence performance.
Deep-red (DR)-to-near-infrared (NIR) phosphorescent organic light-emitting diodes (OLEDs) have potentials for application in various fields ranging from phototherapy to sensing. Accordingly, herein, phenylpyridazine-based bidentate ligands are synthesized and subsequently utilized for the preparation of dinuclear Pt(II) complexes (1-6). The molecular structures of 1-3 is investigated by single-crystal X-ray diffraction, and the results suggest that these complexes have substantially shortened Pt center dot center dot center dot Pt distances (2.906-2.911 angstrom). Complexes 1-6 exhibit intense emissions in the NIR region (700-726 nm), high photoluminescence quantum yield (PLQY) (0.11-0.18), and short phosphorescence decay lifetimes (tau = 0.64-0.95 mu s) in a CH2Cl2 solution. To examine the effect of N-substitution on the dinuclear Pt complexes, the phenylpyrimidine-based Pt(II) emitters 7 and 8 are prepared and discovered to have Pt center dot center dot center dot Pt distances of 2.933 angstrom. 7 and 8 demonstrate strong emissions in the 628-650 nm range with high PLQY of 0.52-0.65. Theoretical studies indicate that the functional groups or atoms in the ligands play crucial roles in the formation of emitters with significantly shortened Pt center dot center dot center dot Pt distances. 3 and 7 are employed as non-doped emitters to fabricate NIR OLEDs, and the resulting OLEDs exhibit electroluminescence peaks at 754 and 692 nm with maximum external quantum efficiencies of 3.0 and 4.4%, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available