Efficient Copper Iodide Cluster-Based Light-Emitting Diodes Enabled by Dual-Anchoring Self-Assembled Monolayers.
basic_science · Level V
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- Record sourced from PubMed, PMID 41906497.
- Also identified by DOI 10.1002/adma.202522698.
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Abstract
Vapor-deposited light-emitting diodes (LEDs) based on non-toxic copper-iodide nanoclusters (Cu NCs) hold immense potential for scalable solid-state lighting and displays. However, interface defects-induced device performance degradation remains a critical challenge for organic-inorganic nanoclusters. Here, we present an interfacial coordinate-bond passivation strategy employing a pyridine-functionalized self-assembled monolayer (SAM) material featuring tailored pyridine anchoring groups. The designed pyridine-functionalized SAM materials simultaneously passivate the Cu NCs emissive layer (EML) and optimize charge injections. Consequently, we demonstrate Cu NCs-based LEDs achieving a peak external quantum efficiency (EQE) of 22.5%, a maximum luminance of 41 432 cd∙m<sup>-2</sup>, and an improved operating half-lifetime of 119 h at 1000 cd∙m<sup>-2</sup>, which is among the best of reported vapor-deposited clusters-based LEDs. Moreover, we demonstrate active-matrix displays by integrating Cu NCs-based LEDs onto drive circuits. This work highlights the critical role of molecularly engineered SAMs in unlocking the high-performance cluster-based LEDs.