Iridium and platinum complexes for OLEDs
Iridium and platinum complexes for OLEDs
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DOI：
10.1533/9780857098948.1.77
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发表时间：
2013-01-01
期刊：
影响因子：
--
通讯作者：
Williams, J. A. G.
中科院分区：
文献类型：
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作者：
Gildea, L. F.;Williams, J. A. G.
在有机发光二极管(OLED)中，通过反向电荷的复合产生的激发态可以是单重态或三重态，后者的形成比高达3：1。由于自旋选择规则，这种三重态在纯有机器件中通常是不发射的。本章描述了如何利用重金属离子的磷光配合物，特别是Ir(III)和Ph(II)作为掺杂剂，利用这些元素的高自旋-轨道耦合常数来诱导三重态的发射。讨论了制备高发光金属配合物的设计策略，以及通过合理的结构修饰来调节发光颜色的方法。给出了一些具有代表性的蓝、红、白发光系统的例子。
The excited states generated in an organic light-emitting diode (OLED) by recombination of opposite charges may be singlet or triplet states, the latter being formed in ratios as high as 3 : 1 over the singlets. Such triplet states are normally non-emissive in a purely organic device, due to the spin selection rule. This chapter describes how phosphorescent complexes of heavy metal ions, particularly iridium(III) and platinum(II), can be used as dopants to induce emission from the triplet states, exploiting the high spin-orbit coupling constants of these elements. Design strategies for preparing highly luminescent metal complexes are discussed, together with methods for tuning the emission colour through rational structural modification. Examples of some representative blue, red and white-emitting systems are presented.