Intermolecular interaction and a concentration-quenching mechanism of phosphorescent Ir(III) complexes in a solid film
Intermolecular interaction and a concentration-quenching mechanism of phosphorescent Ir(III) complexes in a solid film
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DOI：
10.1103/physrevlett.96.017404
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发表时间：
2006-01-13
影响因子：
8.6
通讯作者：
Adachi, C
中科院分区：
文献类型：
--
作者：
Kawamura, Y;Brooks, J;Adachi, C
通过测量薄膜光致发光量子效率和瞬态寿命随基质中掺杂浓度的变化关系，研究了高效Ir（III）磷光发光体的固态自猝灭过程.发现辐射衰减速率常数与掺杂剂分子之间的平均距离（R）无关，浓度猝灭速率常数与R-6有关。对R的猝灭依赖性强烈表明，磷光Ir（III）络合物中的发光浓度猝灭：基质膜由偶极-偶极失活相互作用控制，如福斯特能量转移模型所述。
Solid-state self-quenching processes of highly efficient Ir(III) phosphorescent emitters are investigated by the measurement of thin film photoluminescence quantum efficiency and transient lifetime as a function of doping concentration in a host matrix. The radiative decay rate constant is found to be independent from the average distance between dopant molecules (R), and the concentration-quenching rate constant is shown to be dependent on R-6. The quenching dependence on R strongly suggests that luminescent concentration quenching in a phosphorescent Ir(III) complex:host film is controlled by dipole-dipole deactivating interactions as described by the Forster energy transfer model.