Eliminating nonradiative decay in Cu(I) emitters: >99% quantum efficiency and microsecond lifetime
Eliminating nonradiative decay in Cu(I) emitters: >99% quantum efficiency and microsecond lifetime
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DOI：
10.1126/science.aav2865
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发表时间：
2019-02-08
期刊：
影响因子：
56.9
通讯作者：
Thompson, Mark E.
中科院分区：
文献类型：
--
作者：
Hamze, Rasha;Peltier, Jesse L.;Thompson, Mark E.
铱、铂和钌等重金属的发光配合物在发光和能量转换应用以及有机发光二极管（OLED）中起着重要作用。从更多的地球丰富的铜实现相当的性能需要克服轻金属的弱自旋轨道耦合，以及限制铜（I）[Cu（I）]络合物中典型的高重组能。在这里，我们报告，两个协调的铜（I）配合物与氧化还原活性配体在共面构象表现出抑制非辐射衰减，减少结构重组，和足够的轨道重叠，有效的电荷转移。我们实现了光致发光效率>99%和微秒寿命，这导致了高效的蓝光OLED。光物理分析和模拟揭示了发射单重态和三重态电荷转移态和酰胺定域三重态之间的温度依赖性相互作用。
Luminescent complexes of heavy metals such as iridium, platinum, and ruthenium play an important role in photocatalysis and energy conversion applications as well as organic light-emitting diodes (OLEDs). Achieving comparable performance from more-earth-abundant copper requires overcoming the weak spin-orbit coupling of the light metal as well as limiting the high reorganization energies typical in copper(I) [Cu(I)] complexes. Here we report that two-coordinate Cu(I) complexes with redox active ligands in coplanar conformation manifest suppressed nonradiative decay, reduced structural reorganization, and sufficient orbital overlap for efficient charge transfer. We achieve photoluminescence efficiencies >99% and microsecond lifetimes, which lead to an efficient blue-emitting OLED. Photophysical analysis and simulations reveal a temperature-dependent interplay between emissive singlet and triplet charge-transfer states and amide-localized triplet states.