Engineering of Hole Transporting Interface by Incorporating the Atomic-Precision Ag<sub>6</sub> Nanoclusters for High-Efficiency Blue Perovskite Light-Emitting Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 36763855.
- Also identified by DOI 10.1021/acs.nanolett.3c00068.
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Abstract
Properties of the underlying hole transport layer (HTL) play a crucial role in determining the optoelectronic performance of perovskite light-emitting devices (PeLEDs). However, endowing the current HTL system with a deep highest occupied molecular orbital (HOMO) level concurrent with high hole mobility is still a big challenge, in particular being an open constraint toward high-efficiency blue PeLEDs. In this regard, employing the poly(9-vinylcarbazole) as a model, we perform efficient incorporation of the atomic-precision metal nanoclusters (NCs), [Ag<sub>6</sub>PL<sub>6</sub>, PL = (<i>S</i>)-4-phenylthiazolidine-2-thione], to achieve significant tailoring in both HOMO energy level and hole mobility. As a result, the as-modified PeLEDs exhibit an external quantum efficiency (EQE) of 14.29% at 488 nm. The presented study exemplifies the success of metal NC involved HTL engineering and offers a simple yet effective additive strategy to settle the blue PeLED HTL dilemma, which paves the way for the fabrication of highly efficient blue PeLEDs.