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Non‐toxic halide double perovskite materials have many advantages of lead halide perovskite. Whereas, they usually exhibit poor stability and very low intrinsic photocatalytic CO2 reduction activity due to the insufficient separation of photogenerated charges and the lack of active sites. In this work, stable chlorine‐deficient 3D hierarchical Cs2NaBiCl6 porous microspheres assembled by highly crystalline nanoflakes were prepared by a simple grinding method. An unprecedented CO yield of 30.22 µmol g−1 h−1 was achieved in the gas‐solid photocatalytic reduction of CO2 without sacrificial agents, which is the highest value among lead‐free halide perovskite photocatalysts. Experimental results and density‐functional theory calculations show that the chlorine vacancy plays the triple role of suppressing photogenerated electron‐holes recombination, enhancing CO2 adsorption, and significantly reducing the free energy barrier for the key intermediate COOH* generation. In comparison with the pristine Cs2NaBiCl6, coupling of surface and defect engineering of the hierarchical sample brings 12.34 times enhancement of CO2 photoreduction activity. This work proposes a simple method to synthesize a chlorine‐vacancy rich 3D hierarchical lead‐free halide perovskite and offers a new design idea to substantially enhance the photocatalytic activity, opening a door for the prospective contribution of these materials to carbon neutralization. [ABSTRACT FROM AUTHOR]

Chlorine vacancies, lead-free halide double perovskites, photocatalytic CO 2 reduction, three-dimensional hierarchical structures The CO yield of photocatalytic CO SB 2 sb reduction reached the highest value of lead-free halide perovskite photocatalysts. Keywords: chlorine vacancies; lead-free halide double perovskites; photocatalytic CO 2 reduction; three-dimensional hierarchical structures EN chlorine vacancies lead-free halide double perovskites photocatalytic CO 2 reduction three-dimensional hierarchical structures 1 1 1 11/21/22 20221117 NES 221117 B Halide Double Perovskites b In article number 2202074, Junying Zhang, Jianbei Qiu, and co-workers prepared stable chlorine-deficient three-dimensional hierarchical Cs SB 2 sb NaBiCl SB 6 sb porous microspheres by a simple grinding method. [Extracted from the article]

All-inorganic perovskite quantum dots (QDs) in glass materials, specifically CsPbX 3 (X = Cl, Br, I), are being considered as the next-generation fluorescent materials due to their impressive luminous performance and stability. However, the crystallization process of quantum dots within the glass presents uncontrollable challenge, leading to uneven crystallinity and subsequent reductions in light efficiency, thereby affecting practical applications. In glass ceramics doped with rare-earth oxides, the introduction of rare-earth ions as nucleating agents can promote the self-precipitation of nanocrystalline crystals within the glass. Building upon this principle, we have doped rare-earth ions into borosilicate glass for the first time to induce the self-crystallization of CsPbBr 3 QDs. This approach effectively enhances the equilibrium distribution of quantum dots within the glass, resulting in a significant improvement in luminosity. Furthermore, the luminescence spectrum range of quantum dot-shaped luminescent glass materials can be finely tuned through rare-earth ion doping. This finding holds both theoretical and practical significance for their application in the field of lighting. • Doped rare earth ions can alter the glass network and promote the self-crystallization of CsPbBr 3 quantum dots. • Eliminating the heat treatment process renders it more environmentally friendly. • The self-crystallizing CsPbBr 3 nanocrystals glass is more conducive to practical applications. [ABSTRACT FROM AUTHOR]

• Encapsulating CsPbBr 3 in layered B 2 O 3 via water-induced glass phase transition. • The Luminous performance and stability of CsPbBr 3 NCs are improved. • The prepared LCD covers 130% of the NTSC standard color gamut area. Lead halide perovskite quantum dots are considered to be one of the best candidates for the next generation of light conversion materials. However, their practical application is greatly hindered by its intrinsic poor stability and once exposed to air, heat moisture and illumination. Here, we report a novel reaction scheme that allows the simultaneous production of high-quality CsPbBr 3 nanocrystals (NCs), self-healing process that optimized the crystallinity of CsPbBr 3 NCs, and the formation of a protective coating layered structure of a densely packed two-dimensional B 2 O 3 crystals with the assistance of water. Due to the inherent refractive index mismatch in the B 2 O 3 -CsPbBr 3 -B 2 O 3 (B-C-B) laminated structure, excellent light extraction efficiency was achieved. The resulted layered B 2 O 3 /CsPbBr 3 perovskite composite showed exceptionally high photoluminescence quantum yield (PLQY ∼90%) and excellent stability over 2 years under normal storage condition. A high-performance backlight liquid crystal display (LCD) was designed as B 2 O 3 /CsPbBr 3 @ K 2 SiF 6 : Mn4+ (KSF: Mn4+) @ polydimethylsiloxanes (PDMS) monolithic film, which featured an optimal white emission (with correlated color temperature of 5327 K), that covered 130% of NTSC standard color gamut area of CIE1931, thereby demonstrating a great application potential in the optoelectronics industry. [ABSTRACT FROM AUTHOR]