摘要
以4种钌配合物[Ru(bpy)3]2+,[Ru(bpy)2HPIP]2+,[Ru(dmb)2PIP]2+,[Ru(dmb)2DMNP]2+为研究对象,采用时间分辨的光谱技术分别测量了这4种钌配合物在室温和低温情况下的稳态发光光谱及瞬态发光动力学过程。结果表明,4种样品在低温条件下的发光强度较之室温条件均有所增强,光谱形状有明显变化,瞬态发光寿命也均有延长。分析表明,4种钌配合样品在低温条件下从液态介质固化为刚性介质,电子转移情况发生变化,导致低温发光的光谱形状与室温光谱明显不同。同时速度常数窜越系数kts减小,分子振动和热运动降低,从而提高了磷光量子产率,使得发光增强,寿命也相应延长。
Steady-state luminescence spectra and transient luminescence dynamics process of 4 kinds of ruthenium complexes [Ru（bpy）3]2＋,[Ru（bpy）2HPIP]2＋,[Ru（dmb）2PIP]2＋,[Ru（dmb）2DMNP]2＋ are studied by using time-resolved luminescence spectroscopy.The results indicate that the luminescence intensity is enhanced,the shapes of the spectra are largely changed and the transient luminescence lifetime is prolonged when ruthenium complexes are in low temperature conditions comparing with room temperature.The solvent medium transforms from a fluid to a rigid glass when at 77 K.The electron transfer process in a rigid medium is quite different from that in a fluid media,which results in large changes in the shape of the spectra.The probability of intersystem crossing and amplitude of molecular vibration and thermal motion are all reduced at 77 K comparing with room temperature.Therefore,the phosphorescent quantum yield is highly raised,which leads to enhancement of luminescence and prolongation of lifetimes.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第8期2350-2354,共5页
Acta Optica Sinica
基金
国家973计划(2007CB815306)
中山大学光电材料与技术国家重点实验室开放课题
广东省基金团队项目(9351027501000003)资助课题
关键词
激光光学
瞬态发光动力学
时间分辨光谱技术
钌配合物
laser optics
transient luminescence dynamics
time-resolved spectroscopy
ruthenium complexes complex
