Dynamic multi-color long-afterglow and cold-warm white light through phosphorescence resonance energy transfer in host-guest metal-organic frameworks  

作　　者：Shuya Liu Yuhang Lin Dongpeng Yan 

机构地区：[1]Beijing Key Laboratory of Energy Conversion and Storage Materials,Key Laboratory of Radiopharmaceuticals,Ministry of Education,College of Chemistry,Beijing Normal University,Beijing 100875,China

出　　处：《Science China Chemistry》2023年第12期3532-3538,共7页中国科学（化学英文版）

基　　金：supported by Beijing Municipal Natural Science Foundation (JQ20003);the National Natural Science Foundation of China (22275021)。

摘　　要：Dynamic tuning of single-color and multi-color(including white-light) luminescence has attracted much attention for applications in various fields;however, effective systems are still scarcity to date. Herein, we report the construction of host-guest metal-organic frameworks(MOFs) serves as an effective strategy to achieve the excitation-and time-dependent long afterglow and white light emitting, simultaneously. The guest-induced structural distortion modulates the single-triplet state intersystem crossing, promotes ligand-to-ligand charge transfer(LLCT) in layer-column MOFs, and further boosts multiple exciton generation of triplet states for multi-color ultralong phosphorescence, as indicated by both experiment and density functional theory(DFT) calculation. By further doping of dyes into MOFs, white-light emitting with tunable color temperature can be facilely obtained, which has been further fabricated into white-light light-emitting diode(LED) with color rendering index of 88.4,higher than that of most as-reported pure inorganics and inorganic-organic hybrid systems. Therefore, this work not only describes a host-guest energy transfer route for dynamic tailoring wide range of color-tunable long-afterglow, but also explores the application prospect of new white-light materials with high color rendering and low blue light for promising display and lighting applications.

关 键 词：PHOSPHORESCENCE ligand-to-ligand charge transfer WHITE-LIGHT metal-organic frameworks long-afterglow 

分 类 号：TB34[一般工业技术—材料科学与工程]