Organometallic Pt(II) and Ir(III) Triplet Emitters for OLED Applications and the Role of Spin-Orbit Coupling: A Study Based on High-Resolution Optical Spectroscopy
Organometallic Pt(II) and Ir(III) Triplet Emitters for OLED Applications and the Role of Spin-Orbit Coupling: A Study Based on High-Resolution Optical Spectroscopy
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DOI：
10.1007/3418_2009_6
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发表时间：
2010-01-01
期刊：
影响因子：
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通讯作者：
Yersin, Hartmut
中科院分区：
文献类型：
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作者：
Rausch, Andreas F.;Homeier, Herbert H. H.;Yersin, Hartmut
有机金属三重态发光体的高分辨率光谱揭示了最低三重态和相应的电子和振动跃迁到单重基态的详细见解。作为实例研究，我们对蓝光材料Pt（4，6-dFppy）（acac）和Ir（4，6-dFppy）（2）（acac）进行了详细的研究和表征。这两种化合物的物理性质有很大的不同，主要受自旋轨道耦合（SOC）的控制。因此，我们研究了SOC对三重态的影响，并阐明了占主导地位的SOC和状态混合路径。这些明显取决于化合物的配位几何结构。指出了相对简单的规则和关系。实验和理论相结合的结果使我们走向结构效率的规则和新的有机发光二极管（OLED）发光材料的设计准则。
High-resolution optical spectroscopy of organometallic triplet emitters reveals detailed insights into the lowest triplet states and the corresponding electronic and vibronic transitions to the singlet ground state. As case studies, the blue-light emitting materials Pt(4,6-dFppy)(acac) and Ir(4,6-dFppy)(2)(acac) are investigated and characterized in detail. The compounds' photophysical properties, being markedly different, are largely controlled by spin orbit coupling (SOC). Therefore, we study the impact of SOC on the triplet state and elucidate the dominant SOC and state-mixing paths. These depend distinctly on the compounds' coordination geometry. Relatively simple rules and relations are pointed out. The combined experimental and theoretical results lead us towards structure-efficiency rules and guidelines for the design of new organic light emitting diode (OLED) emitter materials.