Liquid-phase sintering of lead halide perovskites and metal-organic framework glasses
Liquid-phase sintering of lead halide perovskites and metal-organic framework glasses
复制标题
卤化铅钙钛矿和金属有机框架玻璃的液相烧结
DOI：
10.1126/science.abf4460
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发表时间：
2021-10-29
期刊：
影响因子：
56.9
通讯作者：
Bennett, Thomas D.
中科院分区：
文献类型：
--
作者：
Hou, Jingwei;Chen, Peng;Bennett, Thomas D.
描述 玻璃中的稳定发射卤化铅钙钛矿可以表现出明亮的窄带光致发光，但存在与非活性相的形成和铅离子损失相关的稳定性问题。侯等人。研究表明，通过液相烧结与金属有机骨架的玻璃相形成复合材料，可以稳定碘化铯铅的黑色光敏相。光致发光比纯钙钛矿至少高两个数量级。该玻璃在高激光激发下稳定了钙钛矿，在水浸泡10,000小时后仍保持约80%的光致发光。 —PDS 卤化铅钙钛矿和金属有机骨架玻璃的复合材料表现出明亮且稳定的光致发光。卤化铅钙钛矿 (LHP) 半导体表现出卓越的光电特性。然而，其应用的障碍在于它们的多晶型、对极性溶剂的不稳定性、相分离以及对铅离子浸出的敏感性。我们报告了一系列通过液相烧结 LHP 和金属有机框架玻璃制造的可扩展复合材料。该玻璃充当 LHP 的基质，通过界面相互作用有效稳定非平衡钙钛矿相。这些相互作用还可以钝化 LHP 表面缺陷，并赋予宽色域的明亮窄带光致发光，用于制造白色发光二极管 (LED)。可加工的复合材料在浸入水和有机溶剂以及暴露于热、光、空气和环境湿度时表现出高稳定性。这些特性及其铅自封存能力可以使 LHP 实现突破性应用。
Description Stable emission in glass Lead halide perovskites can exhibit bright, narrow band photoluminescence but have stability issues related to formation of inactive phases and the loss of lead ions. Hou et al. show that the black, photoactive phase of cesium lead iodide can be stabilized by forming a composite with a glassy phase of a metal-organic framework through liquid-phase sintering. The photoluminescence is at least two orders of magnitude greater than that of the pure perovskite. The glass stabilizes the perovskite under high laser excitation, and about 80% of the photoluminescence was maintained after 10,000 hours of water immersion. —PDS A composite of a lead halide perovskite and a metal-organic framework glass exhibits bright and stable photoluminescence. Lead halide perovskite (LHP) semiconductors show exceptional optoelectronic properties. Barriers for their applications, however, lie in their polymorphism, instability to polar solvents, phase segregation, and susceptibility to the leaching of lead ions. We report a family of scalable composites fabricated through liquid-phase sintering of LHPs and metal-organic framework glasses. The glass acts as a matrix for LHPs, effectively stabilizing nonequilibrium perovskite phases through interfacial interactions. These interactions also passivate LHP surface defects and impart bright, narrow-band photoluminescence with a wide gamut for creating white light-emitting diodes (LEDs). The processable composites show high stability against immersion in water and organic solvents as well as exposure to heat, light, air, and ambient humidity. These properties, together with their lead self-sequestration capability, can enable breakthrough applications for LHPs.