【摘 要】
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Recently,heavy metal complexes such as Pt(Ⅱ),Ir(Ⅲ),Au(Ⅰ)et al.have been developed with enhanced intersystem crossing(ISC)due to the strong spin-orbit coupling,which overcomes the limitation of 25%effi
【机 构】
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School of Pharmaceutical and Chemical Engineering,Taizhou University,318000 Taizhou,China;College of
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Recently,heavy metal complexes such as Pt(Ⅱ),Ir(Ⅲ),Au(Ⅰ)et al.have been developed with enhanced intersystem crossing(ISC)due to the strong spin-orbit coupling,which overcomes the limitation of 25%efficiency of conventional fluorescent OLEDs with the nature of emission from pure singlet excitons.In general,both singlet and triplet excitons formed with the ratio of 1∶3 under electrical excitation,therefore,contribute the light emission by the fast exciton energy transfer in phosphorescent organic light-emitting diodes(PhOEDs)based on the heavy metal complexes,potentially resulting in a 100%quantum yields.Herein,three Schiff base ligands and their platinum(Ⅱ)complexes were prepared and characterized.The condensation of substituted salicylaldehyde with aniline or 2,4,5-trifluoroaniline,respectively,afforded five Schiff base ligands.Subsequently,their corresponding platinum(Ⅱ)complexes were prepared through the metallation of ligands with K2PtCl4.The ligands and complexes were characterized by 1H NMR,infrared spectroscopy,mass spectrometry and single crystal X-ray diffraction.And their thermal stabilities,photophysical properties,and electrochemical behaviors were investigated in detail.Using these complexes as phosphorescent emitting materials,blue to orange light-emitting devices were fabricated with moderate efficiency.Given the synthetic simplicity and ease of structural variation,the preliminary results here indicate that these platinum(Ⅱ)Schiff base complexes are good candidates for phosphorescent OLEDs.
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