Blue perovskite light-emitting diodes (PeLEDs) still remain poorly developed due to the big challenge of achieving high-quality mixed-halide perovskites with wide optical bandgaps. Halide exchange is an effective scheme to tune the emission color of PeLEDs, while making perovskites susceptible to high defect density due to solvent erosion. Herein, we propose a versatile strategy for nondestructive in-situ halide exchange to obtain high-quality blue perovskites with low trap density and tunable bandgaps through long alkyl chain chloride incorporated chloroform post-treatment. In comparison with conventional halide exchange method, the ionic exchange mechanism of the present strategy is similar to a bimolecular nucleophilic substitution process, which simultaneously modulates perovskite bandgaps and inhibits new halogen vacancy generation. Consequently, efficient PeLEDs across blue spectral regions are obtained, exhibiting external quantum efficiencies of 23.6% (sky-blue emission at 488 nm), 20.9% (pure-blue emission at 478 nm), and 15.0% (deep-blue emission at 468 nm), respectively.
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http://dx.doi.org/10.1038/s41467-024-55074-4 | DOI Listing |
Adv Sci (Weinh)
December 2024
Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.
Localized atomistic disorder in halide-based solid electrolytes (SEs) can be leveraged to boost Li mobility. In this study, Li transport in structurally modified LiHoCl, via Br introduction and Li deficiency, is explored. The optimized Li Ho Cl Br achieves an ionic conductivity of 3.
View Article and Find Full Text PDFAcc Chem Res
December 2024
Department of Chemistry, Northeast Normal University, Changchun 130024, China.
ConspectusIn the past decade, single-atom skeletal editing, which involves the precise insertion, deletion, or exchange of single atoms in the core skeleton of a molecule, has emerged as a promising synthetic strategy for the rapid construction or diversification of complex molecules without laborious synthetic processes. Among them, carbene-initiated skeletal editing is particularly appealing due to the ready availability and diverse reactivities of carbene species. The initial endeavors to modify the core skeleton of heteroarenes through carbon-atom insertion could date back to 1881, when Ciamician and Denstedt described the conversion of pyrroles to pyridines by trapping haloform-derived free carbene.
View Article and Find Full Text PDFInorg Chem
December 2024
College of Chemistry and Materials Science, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou 350007, China.
The strategy of organic ligand exchange is proposed to tune the optical properties of organic-inorganic hybrid cuprous halides. In this work, the chiral ligand (S)-(-)-2,2'-bis(di--tolylphosphino)-1,1'-binaphthyl ((S)-Tol-BINAP) and achiral triphenylphosphine (PPh) are introduced into cuprous halides CuX-PPh-[(S)-Tol-BINAP] (X = Cl, Br, I) through organic ligand exchange. As a result, the mixed organic ligands can enhance second harmonic generation (SHG) and aggregation-induced emission (AIE) optical properties.
View Article and Find Full Text PDFMacromol Rapid Commun
December 2024
College of Textile and Clothing Engineering, Soochow University, Suzhou, 215123, China.
Hygroscopic materials based on highly hygroscopic salts are promising for atmospheric water harvesting (AWH), but the metal- or halide-containing highly hygroscopic salts often have leakage and corrosion issues. Here, the design and synthesis of metal- and halide-free, highly hygroscopic, and macroporous polymers from [2-(acryloyloxy)ethyl]trimethylammonium chloride simply via in situ foaming, solidification, and ion exchange are reported. The resulting polymers exhibit highly interconnected macroporous structure, robust compression, and leakage-free performance, and they also demonstrate relatively high moisture adsorption capacities (up to 1.
View Article and Find Full Text PDFJ Phys Chem Lett
December 2024
Key Laboratory of Flexible Electronics (KLOFE), School of Flexible Electronics (Future Technologies) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
Achieving deep-blue emission is crucial for the practical application of perovskite light-emitting diodes (LEDs) in displays. Increasing the ratio of chlorine to bromine in the perovskite is a facile method to achieve deep-blue emission. However, the low solubility of chloride in the perovskite precursor solution and the low formation energy of defects present challenges that limit device efficiency.
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