3D perovskites are promising to achieve efficient and bright deep-blue light-emitting diodes (LEDs), which are required for lighting and display applications. However, the efficiency of deep-blue 3D perovskite-based LEDs is limited by high density of defects in perovskites, and their deep-blue emission is not easy to achieve due to the halide phase separation and low solubility of chloride in precursor solutions. Here, an in situ halide exchange method is developed to achieve deep-blue 3D perovskites by spin-coating an organic halide salts solution to treat blue 3D perovskites. It is revealed that the halide-exchange process is mainly determined by halide ion diffusion targeting a concentration equalization, which leads to homogeneous 3D mixed-halide perovskites. By further introducing multifunctional organic ammonium halide salts into the exchange solution to passivate defects, high-quality deep-blue perovskites with reduced trap density can be obtained. This approach leads to efficient deep-blue perovskite LEDs with a peak external quantum efficiency (EQE) of 4.6% and a luminance of 1680 cd m , which show color coordinates of (0.131, 0.055), very close to the Rec. 2020 blue standard. Moreover, the halide exchange method is bidirectional, and blue perovskite LEDs can be achieved with color coordinates of (0.095, 0.160), exhibiting a high EQE of 11.3%.
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http://dx.doi.org/10.1002/adma.202207111 | 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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