Synthesis and Characterization of Polymerizable Phosphorescent Platinum(II) Complexes for Solution-Processible Organic Light-Emitting Diodes
摘要:
A norbomene-functionalized derivative of acetylacetone has been used to synthesize a series of new polymerizable norbornene-derivatized phosphorescent platinum complexes of the form Pt(C ( ) over capN)(O ( ) over capO*) where CAN represents a cyclometalated ligand and O ( ) over capO* represents the functionalized acetylacetonate ligand. The complexes have been fully characterized, and the structures of three examples have been determined by X-ray diffraction. Solution absorption and luminescence spectra and electrochemical data are very similar to those for analogues without these polymerizable groups. A 9,9-dialkyl-2,7-di(carbazol-9-yl)fluorene material, in which one of the alkyl groups bears a norbornene group, has been synthesized and copolymerized with the Pt(C ( ) over capN)(O ( ) over capO*) Complexes using Grubbs ruthenium catalysts, resulting in copolymers with broad molecular weight distributions. The copolymers have been used as lumophores in organic light-emitting diodes, thus demonstrating that platinum phosphors can be successfully integrated into the "hybrid" approach to organic light-emitting diodes, in which molecules with transport or luminescent properties are covalently attached to electronically inert polymer backbones to give solutionprocessible materials. Emission from aggregate states appears to play a similar role in these copolymers to that seen in vapor-deposited devices based on small phosphor and host molecules; in particular, considerable aggregate emission is observed when a phosphor with blue solution emission is used in the devices.
Organoplatinum(II) Cruciform: A Versatile Building Block to Fabricate 2D Microcrystals with Full‐Color and White Phosphorescence and Anisotropic Photon Transport
controllable preparations of two-dimensional phosphorescent crystals remain a challenging task. In stark contrast to the conventional one-dimensional assemblies of square-planar platinum complexes, organoplatinum(II) complexes with a cruciform shape form two-dimensional microcrystals with full-color and white phosphorescence by unique molecular stackings, opening a new avenue for the preparations of phosphorescent