Perovskite Light-Emitting Devices Based on Solid-State Diffusion In Situ Dynamic Thermal Crystallization.

Due to the excellent photonic and electrical properties of metal halide perovskite materials, perovskite light-emitting devices have the potential to replace OLED devices as the next-generation of commercial light-emitting devices. In this article, we controlled the surface morphology of PbBr using an in situ dynamic thermal crystallization process, which increased the specific surface area of the films and promoted the solid-state diffusion rate. The CsPbBr PeLEDs prepared using this method achieved a maximum current efficiency of 7.

Photo- and Thermal-Induced Ion Migration and Phase Separation in Mn-Doped Two-Dimensional PEAPbX Perovskite.

Ion migration and phase separation in perovskite materials have negatively affected the solid-state lighting and display. Studying photo- and thermal-induced degradation is considered as a promising approach to understanding the luminescence mechanism and promoting practical applications. Herein, the Mn-doped two-dimensional PEAPbX (X = Cl, Br, I) microcrystals with changing halogen composition were synthesized by an acid-assisted post-processing strategy.

Near-unity blue-orange dual-emitting Mn-doped perovskite nanocrystals with metal alloying for efficient white light-emitting diodes.

The tunable dual-color emitting Mn doped CsPbClBr nanocrystals (NCs) with near-unity photoluminescence quantum yield (PL QY) were synthesized through post-treatment of metal bromide at room temperature for fabrication of efficient warm white light-emitting diodes (WLEDs). Especially, the CdBr treated blue-orange emitting Mn doped NCs with various Mn/Pb molar feed ratios exhibit higher PL QY of 97% and longer Mn PL lifetime of 0.9 ms.

Near-Unity Red Mn Photoluminescence Quantum Yield of Doped CsPbCl Nanocrystals with Cd Incorporation.

Although Mn doping in semiconductor nanocrystals (NCs) has been studied for nearly three decades, the near 100% photoluminescence (PL) quantum yield (QY) of Mn emission has never been realized so far. Herein, greatly improved PL QYs of Mn emissions are reported in Mn-doped CsPbCl NCs with various Mn doping concentrations after CdCl post-treatment at room temperature. Specifically, the near-unity QY and near single-exponential decay of red Mn emission peaking at 627 nm in doped CsPbCl NCs are obtained for the first time.

Tunable photoluminescence and an enhanced photoelectric response of Mn-doped CsPbCl perovskite nanocrystals via pressure-induced structure evolution.

Mn:CsPbCl nanocrystals (NCs) were synthesized using a modified one-pot injection method, which exhibits significantly improved thermal stability. For the first time, the pressure-treated optical and structural properties of synthetic Mn:CsPbCl NCs were further investigated, and their associated intriguing electrical and photoelectric properties were revealed from impedance spectra and photocurrent measurements under compression. The pressure-dependent photoluminescence experienced an initial redshift before 1.