19 小时之前 · Light emitting diode based on perovskite nanocrystal (PeLED) has attracted widespread attention and achieved rapid advancements in recent years. Howev…

2023年7月2日 · Molecular engineering toward the structure of a passivation ligand is essential to improve the photoluminescence (PL) efficiency of perovskite nanocrystals (PNCs).

Here, we synthesized pure iodine-based perovskite nanomaterials (P1-P6) with peak emission ranging from 515 to 683 nm at room temperature by introducing ZnI 2 and changing the type and amount of cesium precursor. The role of Zn 2+ is passivating surface defects and enhancing the luminescent performance of the products.

19 小时之前 · Highlights • The A and X site vacancies of perovskite nanocrystal surface was simultaneously manipulated. • The resurfaced nanocrystals exhibit improved structure stability, optical properties and electrical coupling. • High efficiency pure-red perovskite light-emitting diodes (peak EQE of 21.34%) with negligible EL spectrum change was realized.

1 天前 · In the solution process using perovskite nanocrystals (PNCs) as emitting materials for light-emitting diodes (LEDs), solvent orthogonality typically plays a crucial role in preserving stable interfacial conditions between the carrier transport layers on both sides. Unfortunately, there is a lack of clear understanding of which solvent to choose and what effects the …

4 天之前 · Strongly confined perovskite nanocrystals with a size below the exciton Bohr diameter 25 for deep-blue emission require more stringent preparation conditions and ligand purification processes 26, 27.

2021年8月11日 · Since CR, HR, and Hyd processes can enhance the quality of the PbI 2precursor by compensating iodide defects, we infer that more iodine is able to participate in the reaction medium to grow bigger nanocrystals. However, the appearance of structural defects such as Cs+and I−vacancies could affect its growth and stabilization.

2023年6月29日 · In this work, we employ an in situ passivation method by introducing hydroiodic acid (HI) into the precursor solution to obtain high-quality CsPbI 3 QDs. We systematically tuned the added concentration of HI and characterized the structural, optical, electrical, and morphological properties.

2025年1月15日 · We employed an in situ chiral ligand modification using R-/S-1- (4-bromophenyl)-ethylammonium bromide to imprint chirality onto CsPbBr 3 nanocrystals, which exhibited both a high photoluminescence quantum yield of 89% and improved spin relaxation lifetime. A remarkable spin-polarization of 88% was observed for the CsPbBr 3 nanocrystal films.

Here, we report on the synthesis of all inorganic CsPbI 3 perovskite nanocrystals capped with didodecyldimethylammonium bromide (DDAB). Monodispersed DDAB-capped CsPbI 3 NCs have enhanced stability with respect to their morphological and optical properties compared to conventional oleic acid (OA)/oleylamine (OLA) capped nanocrystals.