三峡大学Dong-Sheng Li团队宣布他们研制了一种小的D-A分子，具有高度耐热的室温磷光，具有白色发光和防伪作用。2024年2月6日，国际知名学术期刊《结构化学》发表了这一成果。

在该研究中，研究人员研究了一个简单的供体-受体(D-A)分子9-(1H-苯并三唑-1-甲基)- 9H-咔唑 (CzBtrz)。令人印象深刻的是，该简单分子不仅具有白光、热激活延迟荧光(TADF)和在545 nm处寿命为988.54 ms的超长室温磷光(RTP)等多重发射特性，更重要的是，它具有超高的耐热磷光性能，在77 ~ 350 K (ΔT = 273 K)的大温度范围内保持稳定的磷光性能，超过了其他室温磷光体系。

同时，该分子表现出随时间演化的动态RTP。CzBtrz晶体的实验和理论分析表明，分子内电荷转移相互作用和分子堆积在RTP的产生中起着重要作用。因此，本工作为设计超高耐热RTP、超长RTP和单相白光材料提供了一种有效的策略。

据介绍，从纯小分子中获得高耐热室温磷光(RTP)性能和高白光发射，是一项有意义但具有挑战性的工作。

附：英文原文

Title: A small D-A molecule with highly heat-resisting room temperature phosphorescence for white emission and anti-counterfeiting

Author: anonymous

Issue&Volume: 2024-02-06

Abstract: Achieving high heat-resisting room temperature phosphorescence (RTP) performance and robust white emission from pure small molecules is a meaningful but challenging work. Herein, a simple donor-acceptor (D-A) molecule, 9-(1H-Benzotriazol-1-ylmethyl)-9H-carbazole (CzBtrz), was investigated. Impressively, this simple molecule not only exhibit the multiple emissions including white light, thermally activated delayed fluorescence (TADF) and ultralong RTP with a lifetime of 988.54 ms at 545 nm, importantly, it shows the superhigh heat-resisting phosphorescence property, the phosphorescence performance can maintain stability in a large temperature region from 77 to 350 K (ΔT = 273 K), exceeding those of other RTP systems. Meanwhile, this molecule shows the time-evolved dynamic RTP. The experiment and theoretical analysis from CzBtrz crystal demonstrated that the intramolecular charge transfer interaction and molecular stacking play an important role in the generation of RTP. Therefore, this work provides an efficient strategy to design ultrahigh heat-resistant RTP, ultralong RTP and single-phased white-light emitting materials.

DOI: 10.1016/j.cjsc.2024.100244

Source: http://cjsc.ac.cn/cms/issues/565