In search of high-performance platinum(II) phosphorescent materials for the fabrication of red electroluminescent devices
Resource
Advanced Functional Materials 15 (2): 223-229
Journal
Advanced Functional Materials
Journal Volume
15
Journal Issue
2
Pages
223-229
Date Issued
2005
Author(s)
Abstract
Abstract The rational design and syntheses of Pt(iqdz) 2 ( 1 ) and Pt(pydz) 2 ( 2 ) bearing isoquinolinyl indazole (iqdz)H or pyridyl indazole (pydz)H groups on the coordinating ligands are reported. Single‐crystal X‐ray diffraction studies of 1 reveal a square planar geometry, in which two iqdz ligands adopt a trans‐configuration. Short N…H contacts (∼2.21 Å) are detected between the ortho‐hydrogen atom of isoquinoline and the adjacent N atom of the indazole fragment, making the overall molecular geometry analogous to that of the platinum( II ) porphyrinato complexes. The lowest absorption bands for both complexes reveal strong state mixings between singlet and triplet (metal‐to‐ligand charge transfer and intra‐ligand) manifolds. This, in combination with the introduction of a camphor‐like structure to avoid the stacking effect, leads to phosphorescence with unprecedented brightness both in solution and in the solid state. Organic light‐emitting diode (OLED) devices fabricated using 1 as a dopant emitter have been achieved in a multilayer configuration. The results constitute the first highly efficient Pt II ‐based red OLED.
Type
journal article
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