【摘 要】
：
A series of tetradentate Pd(Ⅱ) and Pt(Ⅱ) complexes containing fused 5/6/6 metallocycles with phenyl N-heteroaromatic ben-zo[d]imidazole (pbiz),benzo[d]oxazole (pboz) or benzo[d]thiazole (pbthz)-containing ligands was developed.Systematic studies by experi
【机 构】
：
College of Chemical Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang 310014,China;MOE
论文部分内容阅读
A series of tetradentate Pd(Ⅱ) and Pt(Ⅱ) complexes containing fused 5/6/6 metallocycles with phenyl N-heteroaromatic ben-zo[d]imidazole (pbiz),benzo[d]oxazole (pboz) or benzo[d]thiazole (pbthz)-containing ligands was developed.Systematic studies by experiments and theoretical calculations reveal that both the central metal and the benzannulated N-heteroaromatic ring have sig-nificant influence on the electrochemical,photophysical and excited-state properties of the Pd(Ⅱ) and Pt(Ⅱ) complexes.In identical condition,compared to pbiz-based Pd(Ⅱ) and Pt(Ⅱ) complexes,the corresponding metal complexes with pboz and pbthz-containing ligand show significant red-shift emission spectra.Pd(Ⅱ) complexes exhibit blue-shift emission spectra in comparison with the corre-sponding Pt(Ⅱ) complexes.The Pt(Ⅱ) complexes possess more metal-to-ligand charge transfer (3MLCT) character in their T1 states,which enables the Pt(Ⅱ) complexes to have much higher quantum efficiencies (ΦPL) and shorter excited-state lifetimes (τ),resulting in large radiative decay rates (kr).Especially,Pt(pbiz) has a ΦPL of 94％ with a τ of 4.0 μs in 5 wt％ doped PMMA film at room tempera-ture.Pt(pbiz)-doped green organic light-emitting diode (OLED) using 26mCPy as host demonstrated a peak external quantum effi-ciency (EQE) of 21.6％ and a maximum brightness (Lmax) of 55481 cd/m2,which still maintained an EQE of 16.5％ and 10.8％ at 1000 and 10000 cd/m2,respectively.
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