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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Highly sensitized near-infra red luminescence in Ir-Ln heteronuclear coordination polymers via light-harvesting antenna of Ir(III) unit
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Highly sensitized near-infra red luminescence in Ir-Ln heteronuclear coordination polymers via light-harvesting antenna of Ir(III) unit

机译：通过Ir（III）单元的光收集天线使Ir-Ln异核配位聚合物中的高敏近红外发光

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摘要

Four novel iridium-lanthanide heteronuclear coordination polymers {Ln[lr(ppy)_2(dcbpy)]_2(OH)} ? H2O (Ir-Ln; Ln = Gd, Yb, Er, Nd, ppy = 2-phenylpyridine, dcbpy = 2,2'-bipyridine-4,4'-dicarboxylate) were successfully obtained by hydrothermal reactions based on a Ir unit (lr(ppy)_2(Hdcbpy), L-H). In these complexes, the Ir unit acts as a good light-harvesting antenna showing high visible light absorption via triplet metal-to-ligand charge transfer (~3MLCT), and effectively sensitizes Ln(III)-based near-infrared (NIR) luminescence by d → f energy transfer from the Ir unit to the Ln~(3+) ions. Those coordination polymers display the characteristic NIR emission of Ln(III) ions (Ln = Yb, Er, Nd) when being excited by 500 nm visible light, while the characteristic ~3MLCT luminescence of the Ir unit was almost quenched. The Ir-Nd polymer exhibited the maximum quenching of the ~3MLCT luminescence of the Ir unit because the Nd(III) ion is the most effective energy-acceptor with a high density of low-lying f-f states. The coordination polymer structures of Ir-Ln reduce the effect of high-energy oscillators (O-H, C-H) and further increase the Ln(III)-based emission lifetimes and quantum yields. The successfully acquired highly sensitized NIR luminescent Ir-Ln coordination polymers pave a new approach to the design and synthesis of NIR luminescent materials.
机译：四种新颖的铱镧系元素杂核配位聚合物{Ln [lr（ppy）_2（dcbpy）] _ 2（OH）}？通过基于Ir单元的水热反应成功获得了H2O（Ir-Ln; Ln = Gd，Yb，Er，Nd，ppy = 2-苯基吡啶，dcbpy = 2,2'-联吡啶-4,4'-二羧酸盐）（ lr（ppy）_2（Hdcbpy），LH）。在这些配合物中，Ir单元可作为良好的光收集天线，通过三重态金属到配体的电荷转移（〜3MLCT）表现出高可见光吸收，并有效地敏化了基于Ln（III）的近红外（NIR）发光通过d→f从Ir单元到Ln〜（3+）离子的能量转移。当被500 nm可见光激发时，那些配位聚合物显示Ln（III）离子的特征性NIR发射（Ln = Yb，Er，Nd），而Ir单元的〜3MLCT发光几乎被淬灭。 Ir-Nd聚合物表现出Ir单元〜3MLCT发光的最大猝灭，因为Nd（III）离子是最有效的能量受体，具有高密度的低价f-f态。 Ir-Ln的配位聚合物结构降低了高能振荡器（O-H，C-H）的影响，并进一步提高了基于Ln（III）的发射寿命和量子产率。成功获得的高敏NIR发光Ir-Ln配位聚合物为NIR发光材料的设计和合成铺平了新方法。

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