《自然》（20240704出版）一周论文导读

 
《自然》（20240704出版）一周论文导读  
 

 

编译 | 未玖

Nature,  4 July 2024, VOL 631, ISSUE 8019

《自然》2024年7月4日，第631卷，8019期

材料科学Materials Science

Fabrication of red-emitting perovskite LEDs by stabilizing their octahedral structure

稳定八面体结构制备红色发光钙钛矿LED

▲ 作者：Lingmei Kong, Yuqi Sun, Bin Zhao, Kangyu Ji, Jie Feng, Jianchao Dong, et al.

▲ 链接：

https://www.nature.com/articles/s41586-024-07531-9

▲ 摘要：

基于金属卤化物钙钛矿（PeLEDs）的发光二极管（LEDs）具有高色彩质量和易于溶液处理的优点，是全彩和高清显示器颇有前景的候选者。尽管人们在应用溴化铅钙钛矿的绿色PeLEDs中取得了巨大成功，但使用碘基对应物实现纯红色（620~650 nm）LEDs仍颇具挑战性，因其受到低本征带隙的限制。

研究组报道了整个纯红色区域的高效和颜色稳定的PeLEDs，通过将双端锚定配体分子掺杂至纯碘钙钛矿中，在638 nm处的峰值外量子效率达到28.7%。他们证明了有机插层阳离子的一个关键功能是通过与暴露的铅离子配位和增强与碘的氢键来稳定铅碘八面体。该分子协同促进光谱调制，促进钙钛矿量子阱之间的电荷转移，并减少电偏压下的碘迁移。

研究组实现了碘基钙钛矿薄膜的连续可调发射波长，并抑制了由于离子钙钛矿中铅碘键能随着带隙增加而降低导致的能量损失。重要的是，所得器件在初始亮度为100 cd m?2时表现出杰出的光谱稳定性和超过7600 min的半衰期。

▲ Abstract：

Light-emitting diodes (LEDs) based on metal halide perovskites (PeLEDs) with high colour quality and facile solution processing are promising candidates for full-colour and high-definition displays. Despite the great success achieved in green PeLEDs with lead bromide perovskites, it is still challenging to realize pure-red (620–650?nm) LEDs using iodine-based counterparts, as they are constrained by the low intrinsic bandgap. Here we report efficient and colour-stable PeLEDs across the entire pure-red region, with a peak external quantum efficiency reaching 28.7% at 638?nm, enabled by incorporating a double-end anchored ligand molecule into pure-iodine perovskites. We demonstrate that a key function of the organic intercalating cation is to stabilize the lead iodine octahedron through coordination with exposed lead ions and enhanced hydrogen bonding with iodine. The molecule synergistically facilitates spectral modulation, promotes charge transfer between perovskite quantum wells and reduces iodine migration under electrical bias. We realize continuously tunable emission wavelengths for iodine-based perovskite films with suppressed energy loss due to the decrease in bond energy of lead iodine in ionic perovskites as the bandgap increases. Importantly, the resultant devices show outstanding spectral stability and a half-lifetime of more than 7,600?min at an initial luminance of 100?cd?m?2.

化学Chemistry

Expanding chemistry through in vitro and in vivo biocatalysis

通过体外和体内生物催化扩展化学

▲ 作者：Elijah N. Kissman, Max B. Sosa, Douglas C. Millar, Edward J. Koleski, Kershanthen Thevasundaram & Michelle C. Y. Chang

▲ 链接：

https://www.nature.com/articles/s41586-024-07506-w

▲ 摘要：

生命系统包含一个巨大的代谢反应网络，为化学过程提供了丰富的酶和细胞作为潜在生物催化剂。

蛋白质和细胞生物催化剂的特性（即高选择性、在环境友好条件下控制反应序列和操作的能力）提供了高效生产分子的方法，同时降低了工业化学的成本和环境影响。此外，生物催化提供了产生化学合成可能无法获得的化学结构和功能的机会。

研究组综合考虑了酶、生物合成途径和细胞工程的发展，使其能够用于催化新的化学和其他方向。

▲ Abstract：

Living systems contain a vast network of metabolic reactions, providing a wealth of enzymes and cells as potential biocatalysts for chemical processes. The properties of protein and cell biocatalysts—high selectivity, the ability to control reaction sequence and operation in environmentally benign conditions—offer approaches to produce molecules at high efficiency while lowering the cost and environmental impact of industrial chemistry. Furthermore, biocatalysis offers the opportunity to generate chemical structures and functions that may be inaccessible to chemical synthesis. Here we consider developments in enzymes, biosynthetic pathways and cellular engineering that enable their use in catalysis for new chemistry and beyond.

Dynamic stereomutation of vinylcyclopropanes with metalloradicals

乙烯基环丙烷与金属自由基的动态立体变化

▲ 作者：Marvin Mendel, Teresa M. Karl, Jegor Hamm, Sherif J. Kaldas, Theresa Sperger, Bhaskar Mondal, et al.

▲ 链接：

https://www.nature.com/articles/s41586-024-07555-1

▲ 摘要：