Aggregation-induced emission (AIE) has become a hot research topic. The generation of new AIE luminogens (AIEgens) will further promote the development of the AIE area. Currently, AIEgens with different emission colours have been reported. However, full-colour emissive luminogens based on a single AIE core and the structure–property relationship are rarely reported. To tackle this challenge, in this work, six tetraphenylpyrazine (TPP)-based luminogens DTPP, DTPP-Ph, DTPP-BT, DTPP-T, DTPP-TO and DTPP-TBTT are rationally designed by varying the effective conjugation and donor–acceptor units and facilely prepared under mild reaction conditions. The photophysical property investigation shows that they exhibit bright blue to red emission in the film states, covering the whole visible light range. Through systematic experimental investigations and theoretical calculations, their structure–photophysical property, and the competition of restriction of intramolecular motion and intramolecular charge-transfer are unambiguously elaborated. Moreover, DTPP-BT can be used as a reversible mechanochromic material and an indicator to show the exciton recombination area in OLEDs. This work provides guidance for further design of AIEgens with high efficiency and full-colour emission from a single AIE core.

中文翻译：

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基于四苯基吡嗪的发光剂，发出全色†

聚集诱导排放（AIE）已成为研究的热点。新的AIE发光剂（AIEgens）的产生将进一步促进AIE领域的发展。目前，已经报道了具有不同发射颜色的AIEgens。但是，很少报道基于单个AIE核和结构-性质关系的全色发光体。为了应对这一挑战，在这项工作中，通过改变有效的共轭和供体受体，合理设计了六种基于四苯基吡嗪（TPP）的发光剂DTPP，DTPP-Ph，DTPP-BT，DTPP-T，DTPP-TO和DTPP-TBTT并在温和的反应条件下轻松制备。光物理性质研究表明，它们在薄膜状态下呈现出明亮的蓝色至红色发射，覆盖了整个可见光范围。通过系统的实验研究和理论计算，对它们的结构-光物理性质以及分子内运动和分子内电荷转移的限制竞争进行了明确的阐述。此外，DTPP-BT可用作可逆的变色材料和指示剂，用于显示OLED中的激子复合区域。这项工作为进一步设计AIEgens提供了指导，该AIEgens的高效性和来自单个AIE核心的全色发射。