Color-Tunable Polymeric Long-Persistent Luminescence Based on Polyphosphazenes.,Advanced Materials

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Color-Tunable Polymeric Long-Persistent Luminescence Based on Polyphosphazenes.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-13 , DOI: 10.1002/adma.201907355
Zhonghao Wang ₁ , Yongfeng Zhang ₁ , Chang Wang ₁ , Xian Zheng ₁ , Yan Zheng ₁ , Liang Gao ₁ , Chaolong Yang _{1,

2} , Youbing Li ₁ , Lunjun Qu ₁ , Yanli Zhao ₂

Affiliation

Organic long-persistent luminescence (OLPL) materials have attracted wide attention on account of their fascinating luminescence properties, presenting application prospects in the fields of bioimaging, information security, displays, anti-counterfeiting, and so on. Some effective strategies have been developed to promote the intersystem crossing (ISC) of the excited singlet state to triplet state and limit nonradiative transition, and thus OLPL materials with long lifetime (more than 1s) and high quantum yield have been explored. However, OLPL materials with dynamic and excitation-dependent characteristics are rarely reported. In this work, two novel polyphosphazene derivatives containing carbazolyl units are designed and synthesized successfully, and then they are doped into poly(vinyl alcohol) (PVA) films to achieve polymeric long-persistent luminescence (PLPL). Unexpectedly, excitation-dependent PLPL (ED-PLPL) is obtained under ambient conditions (in air at room temperature), and the persistent luminescence color can be changed from blue to green upon varying the excitation wavelength. At the same time, a dynamic cycle of ED-PLPL is realized based on the formation and destruction of hydrogen bonding interactions between the PVA chains and polyphosphazene phosphor. This work provides a new strategy for the design of color-tunable polymeric luminescent materials under ambient conditions.

中文翻译：

基于聚磷腈的可调谐颜色的聚合物持久发光。

有机持久发光（OLPL）材料因其令人着迷的发光特性而备受关注，在生物成像，信息安全，显示，防伪等领域具有广阔的应用前景。已经开发出一些有效的策略来促进激发单重态到三重态的系统间穿越（ISC）并限制非辐射跃迁，因此，人们探索了寿命长（大于1s）和高量子产率的OLPL材料。但是，很少报道具有动态和激发相关特性的OLPL材料。在这项工作中，成功设计并合成了两种新型的含有咔唑基单元的聚磷腈衍生物，然后将它们掺杂到聚乙烯醇（PVA）薄膜中，以实现聚合物长持续发光（PLPL）。出乎意料的是，在环境条件下（在室温下的空气中）获得依赖于激发的PLPL（ED-PLPL），并且在改变激发波长时，持久发光颜色可以从蓝色变为绿色。同时，基于PVA链与聚磷腈荧光粉之间氢键相互作用的形成和破坏，实现了ED-PLPL的动态循环。这项工作为在环境条件下设计颜色可调的聚合物发光材料提供了新的策略。改变激发波长后，持久发光颜色可以从蓝色变为绿色。同时，基于PVA链与聚磷腈荧光粉之间氢键相互作用的形成和破坏，实现了ED-PLPL的动态循环。这项工作为在环境条件下设计颜色可调的聚合物发光材料提供了新的策略。改变激发波长后，持久发光颜色可以从蓝色变为绿色。同时，基于PVA链与聚磷腈荧光粉之间氢键相互作用的形成和破坏，实现了ED-PLPL的动态循环。这项工作为在环境条件下设计颜色可调的聚合物发光材料提供了新的策略。

更新日期：2020-02-18

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