Single-component emitters with stable and bright warm white-light emission are highly desirable for high-efficacy warm white light-emitting diodes (warm-WLEDs), however, materials with such luminescence properties are extremely rare. Lowdimensional lead (Pb) halide perovskites can achieve warm white photoluminescence (PL), yet they suffer from low stability and PL quantum yield (PLQY). While Pb-free air-stable perovskites such as Cs 2 AgInCl 6 emit desirable warm white light, sophisticated doping strategies are typically required to increase their PL intensity. Moreover, the use of rare metal-bearing compounds along with the typically required vacuum-based thin-film processing may greatly increase their production cost. Herein, organic-inorganic hybrid cuprous (Cu + )-based metal halide MA 2 CuCl 3 (MA = CH 3 NH 3 + ) that meets the requirements of i) nontoxicity, ii) high PLQY, and iii) dopant-free is presented. Both single crystals and thin films of MA 2 CuCl 3 can be facilely prepared by a low-cost solution method, which demonstrate bright warm white-light emission with intrinsically high PLQYs of 90-97%. Prototype electroluminescence devices and down-conversion LEDs are fabricated with MA 2 CuCl 3 thin films and single crystals, respectively, which show bright luminescence with decent efficiencies and operational stability. These findings suggest that MA 2 CuCl 3 has a great potential for the single-component indoor lighting and display applications.

Low-dimensional lead (Pb)-free perovskite derivatives have recently been regarded as promising candidates for various optoelectronic applications because of their merits of easy preparation, nontoxicity, and broadband self-trapped exciton emission. However, similar to those Pb-based metal halide perovskites, most of these materials undergo an irreversible structural damage upon exposure to aqueous medium, which imposes restrictions on cyclic utilization in both academic and industrial fields. Herein, we report pure Mn-based metal halide, Cs3MnI5, which readily recovers from aqueous solution under mild heat stress and maintains excellent optical properties with high photoluminescence quantum yields of 73%. Meanwhile, this recyclable halide material demonstrates a sensitive X-ray response with a low detection limit of 0.4 μGy/s, high light yield of 33600 ph/MeV, and spatial resolution of 7.45 lp/mm, being suitable for X-ray imaging.

Double perovskites (DPs) are one of the most promising candidates for developing white light‐emitting diodes (WLEDs) owing to their intrinsic broadband emission from self‐trapped excitons (STEs). Translation of three‐dimensional (3D) DPs to one‐dimensional (1D) analogues, which could break the octahedral tolerance factor limit, is so far remaining unexplored. Herein, by employing a fluorinated organic cation, we report a series of highly luminescent 1D DP‐inspired materials, (DFPD)2MIInBr6 (DFPD=4,4‐difluoropiperidinium, MI=K+ and Rb+). Highly efficient warm‐white photoluminescence quantum yield of 92 % is achieved by doping 0.3 % Sb3+ in (DFPD)2KInBr6. Furthermore, single‐component warm‐WLEDs fabricated with (DFPD)2KInBr6:Sb yield a luminance of 300 cd/m2, which is one of the best‐performing lead‐free metal‐halides WLEDs reported so far. Our study expands the scope of In‐based metal‐halides from 3D to 1D, which exhibit superior optical performances and broad application prospects.

Double perovskites are one of the most promising candidates for developing white‐light‐emitting diodes owing to their intrinsic broadband emission from self‐trapped excitons. In their Research Article (e202213240), Feng Liu, Bin Yang, and co‐workers report a novel highly luminescent one‐dimensional double‐perovskite‐inspired material with a warm‐white photoluminescence quantum yield of 92 %. Furthermore, single‐component warm‐white light emitting diodes were fabricated by using this material.

The interactions of complexes of XeOF2 and XeO3 with a series of different hybridization N-containing donors are studied by means of DFT and MP2 calculations. The aerogen bonding interaction energies range from 6.5 kcal/mol to 19.9 kcal/mol between XeO3 or XeOF2 and typical N-containing donors. The sequence of interaction for N-containing hybridization is sp3>sp2>sp, and XeO3 is higher than XeOF2. For some donors of sp2 and sp3 hybridization, the steric effect plays a minor role in the interaction with the evidence of reduced density gradient plots. The dominant stable part is the electrostatic interaction. In complex of XeO3, the weight of polarization is larger than dispersion, while the situation is opposite for XeOF2 complexes. Except for the sum of the maximum value of molecular electrostatic potential on Xe atom and minimum value of molecular electrostatic potential on N atom, the otherfive interaction parameters including the potential energy density at bond critical point, the equilibrium distances, interaction energies with the basis set superposition error correction, localized molecular orbital energy decomposition analysis interaction energies, and the electron charge density, show great linear correlation coefficients with each other.