Effectively Unlocking the Potential Molecular Room Temperature Phosphorescence of Pure Carbazole Derivatives,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 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.)

Effectively Unlocking the Potential Molecular Room Temperature Phosphorescence of Pure Carbazole Derivatives
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-05-19 , DOI: 10.1002/adom.202200090
Shou Yuan ₁ , Yuefa Zhang ₁ , Junwu Chen ₁ , Yuan Yu ₁ , Lingtai Yue ₁ , Qikun Sun ₁ , Haichang Zhang ₁ , Shanfeng Xue ₁ , Wenjun Yang ₁

Affiliation

The current prevailing views are that carbazole derivatives without isomers show inferior room temperature phosphorescence (RTP) and that N-aryl carbazole derivatives exhibit no ultralong RTP in dilute film states since the distorted structures easily dissipate the excitation energy. In the current work, we present that doping N-aryl carbazole derivatives with heteroatoms and/or heavy halogen into PMMA at the molecular level by thermoplasticizing solution-cast films can achieve ultra-long-lived (>1 s) and highly-efficient (>36%) molecular RTP without the need of crystallization and isomer doping. Unlike isomer-doped crystals that almost all emit yellow RTP, the RTP colors of doped PMMA films depend on the molecular structures of carbazole derivatives. Also, we can realize highly efficient and long-lived red fluorescence afterglow via persistent Förster resonance energy transfer from RTP emission to fluorescent emitter. These colorful afterglow polymer films exhibit an ultra-long (>20 h) photo-activation pattern memory effect. This work has challenged existing experimental results and relative RTP mechanisms, providing a reasonable processing strategy for manifesting and enhancing the deserved RTP properties of organic doped polymers.

中文翻译：

有效释放纯咔唑衍生物的潜在分子室温磷光

目前流行的观点是没有异构体的咔唑衍生物表现出较差的室温磷光 (RTP) 和N-芳基咔唑衍生物在稀薄膜状态下没有表现出超长 RTP，因为扭曲的结构很容易耗散激发能量。在目前的工作中，我们提出通过热塑性溶液流延薄膜在分子水平上将具有杂原子和/或重卤素的N-芳基咔唑衍生物掺杂到PMMA中可以实现超长寿命（> 1 s）和高效（ >36%) 分子 RTP，无需结晶和异构体掺杂。与几乎都发出黄色 RTP 的异构体掺杂晶体不同，掺杂 PMMA 薄膜的 RTP 颜色取决于咔唑衍生物的分子结构。此外，我们可以通过从 RTP 发射到荧光发射器的持续 Förster 共振能量转移来实现高效和长寿命的红色荧光余辉。这些彩色余辉聚合物薄膜表现出超长（>20 小时）的光激活图案记忆效应。这项工作挑战了现有的实验结果和相关的 RTP 机制，为表现和增强有机掺杂聚合物应得的 RTP 性能提供了合理的加工策略。

更新日期：2022-05-19

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