Two-Dimensional Cs<sub>2</sub> AgIn<sub>x</sub> Bi<sub>1-</sub> <sub>x</sub> Cl<sub>6</sub> Alloyed Double Perovskite Nanoplatelets for Solution-Processed Light-Emitting Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 36906925.
- Also identified by DOI 10.1002/adma.202211235.
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Abstract
Lead-free double perovskites have emerged as a promising class of materials with potential to be integrated into a wide range of optical and optoelectronic applications. Herein, the first synthesis of 2D Cs<sub>2</sub> AgIn<sub>x</sub> Bi<sub>1-</sub> <sub>x</sub> Cl<sub>6</sub> (0 ≤ x ≤ 1) alloyed double perovskite nanoplatelets (NPLs) with well controlled morphology and composition is demonstrated. The obtained NPLs show unique optical properties with the highest photoluminescence quantum yield of 40.1%. Both temperature dependent spectroscopic studies and density functional theory calculation results reveal that the morphological dimension reduction and In-Bi alloying effect together boost the radiative pathway of the self-trapped excitons of the alloyed double perovskite NPLs. Moreover, the NPLs exhibit good stability under ambient conditions and against polar solvents, which is ideal for all solution-processing of the materials in low-cost device manufacturing. The first solution-processed light-emitting diodes is demonstrated using the Cs<sub>2</sub> AgIn<sub>0.9</sub> Bi<sub>0.1</sub> Cl<sub>6</sub> alloyed double perovskite NPLs as the sole emitting component, showing luminance maximum of 58 cd m<sup>-2</sup> and peak current efficiency of 0.013 cd A<sup>-1</sup> . This study sheds light on morphological control and composition-property relationships of double perovskite nanocrystals, paving the way toward ultimate utilizations of lead-free perovskite materials in diverse sets of real-life applications.