<br>铝基金属有机框架热解为具有时间依赖性磷光颜色的碳点多孔 Al2O3 复合材料，用于高级信息加密,Small

当前位置： X-MOL 学术 › Small › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

铝基金属有机框架热解为具有时间依赖性磷光颜色的碳点多孔 Al2O3 复合材料，用于高级信息加密
Small ( IF 13.0 ) Pub Date : 2023-08-30 , DOI: 10.1002/smll.202305185
Longyue Zhang ₁ , Xipao Chen ₂ , Yaoping Hu _{1,

3}

Affiliation

具有时间依赖性磷光颜色（TDPC）的磷光材料在先进光学应用中具有巨大潜力。此类材料的合成很有吸引力，但也具有挑战性。本文通过高温热解铝基金属有机骨架NH ₂ -MIL-101(Al)制备了一系列具有独特TDPC特性的碳点多孔Al ₂ O ₃复合材料。在700℃下合成的复合材料(CDs@Al ₂ O ₃ -700)在去除280 nm激发光后显示出磷光颜色从蓝色到绿色的明显变化。光物理分析表明，碳点中的两个发射中心，即碳核和表面态，分别负责短寿命的蓝色磷光（96 ms）和长寿命的绿色磷光（911 ms）。具有不同衰减率的蓝色和绿色磷光的组合触发了有趣的 TDPC 现象。 CDs@Al ₂ O ₃ -700具有高达41.7%的极高磷光量子产率，并且对水、有机溶剂和强氧化剂具有优异的光学稳定性，这得益于多孔Al ₂对CDs的多重限制O ₃基体通过刚性网络、强空间约束和稳定的共价键合。基于TDPC特性，成功地构建了由CDs@Al ₂ O ₃组成的多级编码模式，用于高级动态信息加密。

"点击查看英文标题和摘要"

Pyrolysis of Al-Based Metal–Organic Frameworks to Carbon Dot-Porous Al2O3 Composites With Time-Dependent Phosphorescence Colors for Advanced Information Encryption

Phosphorescent materials with time-dependent phosphorescence colors (TDPCs) have great potential in advanced optical applications. Synthesis of such materials is attractive but challenging. Here, a series of carbon dot-porous Al₂O₃ composites exhibiting distinctive TDPC characteristics is prepared by high-temperature pyrolysis of Al-based metal–organic frameworks NH₂-MIL-101(Al). The composite synthesized at 700 °C (CDs@Al₂O₃-700) shows an obvious change in phosphorescence color from blue to green after removing the excitation light of 280 nm. Photophysical analysis reveals that two emission centers in CDs, namely carbon core and surface states, are responsible for the short-lived blue phosphorescence (96 ms) and long-lived green phosphorescence (911 ms), respectively. The combination of blue and green phosphorescence with different decay rates triggering the interesting TDPC phenomenon. CDs@Al₂O₃-700 has a significantly high phosphorescence quantum yield of up to 41.7% and possesses an excellent optical stability against water, organic solvents, and strong oxidants, which benefits from the multi-confinement of CDs by the porous Al₂O₃ matrix through rigid network, strong space constraint, and stable covalent bonding. Based on the TDPC property, multilevel coding patterns composed of CDs@Al₂O₃ are successfully fabricated for advanced dynamic information encryption.

更新日期：2023-08-30

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南