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The structural and electronic properties of a series of new efficient blue-emitting platinum(Ⅱ)phosphorescent complexes with tridentate ligands have been investigated theoretically in comparison to experimental work by Li group[1].Both DFT and TDDFT with PBE0[2] functional are employed to study the ground and excited states properties of Pt(Ⅱ)complexes.The absorption and emission process are investigated by analyzing the allowed optical transitions.The calculated absorption and emission spectra are in agreement well with the experimental results.The factors that influence phosphorescence efficiency are discussed,which hint us for design novel deep blue phosphorescent platinum(Ⅱ)complexes.