吡啶氮位置对有机发射器湿度敏感性的作用

IF 5.7 Q2 CHEMISTRY, PHYSICAL

ACS Materials Au Pub Date : 2024-09-04 DOI:10.1021/acsmaterialsau.4c00036

Gyana Prakash Nanda, Rajan Suraksha, Pachaiyappan Rajamalli

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引用次数: 0

摘要

湿敏荧光发射体是一类智能材料，在接触水后可改变其发射行为。在这项研究中，我们合成了 4BPy-PTA 和 2BPy-PTA 这两种高荧光有机发射体，并展示了如何通过分子设计修饰来提高湿气敏感性。由于受体单元中的氮原子位置不同，这两种发射体表现出不同程度的湿气敏感性。受潮后，两种发射器的发射颜色都会从黄绿色变为蓝色，但 4BPy-PTA 的偏移（81 纳米）比 2BPy-PTA 的偏移（68 纳米）更大。受潮后，4BPy-PTA 的光致发光量子产率 (PLQY) 从 37% 提高到 48%，而 2BPy-PTA 的 PLQY 则从 59% 降低到 15%。与 2BPy-PTA 相比，4BPy-PTA 具有更短的湿气感应时间、更大的发射色移和更高的 PLQY，因此是一种更好的湿气敏感材料。有趣的是，这些发射器的发射颜色可以通过加热完全恢复，也可以通过对受潮固体施加机械力部分恢复。此外，这些发光体还显示出机械变色发光行为，其发射颜色可在蓝色和绿色之间进行完全可逆的切换。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Role of Pyridine Nitrogen Position on the Moisture Sensitivity of Organic Emitters

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Role of Pyridine Nitrogen Position on the Moisture Sensitivity of Organic Emitters

Moisture-sensitive fluorescent emitters are a class of smart materials that can change their emission behavior upon exposure to water. In this study, we have synthesized two highly fluorescent organic emitters, 4BPy-PTA and 2BPy-PTA, and showed how moisture sensitivity can be enhanced by molecular design modification. Owing to the different nitrogen atom positions in the acceptor units, the emitters show different degrees of moisture sensitivity. Upon moisture exposure, both emitters change their emission color from greenish-yellow to blue, but a larger shift was witnessed in 4BPy-PTA (81 nm) than in 2BPy-PTA (68 nm). Moisture exposure enhances the photoluminescence quantum yield (PLQY) of 4BPy-PTA from 37 to 48%, whereas it suppresses the PLQY of 2BPy-PTA from 59 to 15%. A shorter moisture sensing time, large emission color shift, and enhanced PLQY make 4BPy-PTA a better moisture-sensitive material than 2BPy-PTA. Interestingly, the emission colors of the emitters can be completely regained by heating and partially by applying mechanical force to the moisture-exposed solids. In addition, these emitters also show mechanochromic luminescence behavior with a completely reversible emission color switch between blue and green.

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来源期刊

ACS Materials Au 材料科学-

CiteScore

5.00

自引率

0.00%

发文量

期刊介绍： ACS Materials Au is an open access journal publishing letters articles reviews and perspectives describing high-quality research at the forefront of fundamental and applied research and at the interface between materials and other disciplines such as chemistry engineering and biology. Papers that showcase multidisciplinary and innovative materials research addressing global challenges are especially welcome. Areas of interest include but are not limited to:Design synthesis characterization and evaluation of forefront and emerging materialsUnderstanding structure property performance relationships and their underlying mechanismsDevelopment of materials for energy environmental biomedical electronic and catalytic applications