Conventional polycyclic organic molecules exhibit aggregation-caused quenching (ACQ) effect, and some organic molecules with twisted and propeller backbones could be made into aggregation-induced/enhanced emission (AIE/AEE). However, it was interesting but challenging to enable conjugated molecules derived from fused (hetero)cycles with high photo- and thermal-stability to show multistate emission, rather than only dual emission in solution and crystalline states. In the current work, we presented a rational strategy for realizing multistate emission of 1,4-diketo-pyrrolo [3,4-c]pyrrole (DPP) derivatives by employing imidazole as the additional acceptor bridge and constructing the branched DPP-centered molecule with four peripheral donors (triphenylamine). The resulting D‒A‒D compound (TIDPP) emitted yellow in solution with the fluorescence efficiency of ca. 70%, and its crystalline and amorphous states as well as aqueous suspensions also exhibited impressive fluorescence efficiencies of 40–50%, filling the gap between ACQ and AIE of DPP derivatives. Moreover, aggregation could greatly red-shift emission spectra and significantly enhance the two-photon absorption cross section and excitation fluorescence in the aqueous suspension. TIDPP solid was also found to exhibit the unique mechanochromic blue-shift luminescence and the commendable OFET performance, signifying the existence of aggregation-induced molecular planarization. This work demonstrated that the rational branching effect could manipulate the aggregation emission behaviors and develop the multifunctional materials.

常规的多环有机分子表现出聚集引起的猝灭（ACQ）效应，一些具有扭曲主链和螺旋桨主链的有机分子可以被制成聚集诱导/增强发射（AIE / AEE）。但是，有趣的是，但具有挑战性的是，使具有高光稳定性和热稳定性的，来自稠合（杂）环的共轭分子能够显示多态发射，而不是溶液态和结晶态的双态发射。在当前的工作中，我们提出了一种合理的策略，通过使用咪唑作为额外的受体桥并构建以DPP为中心的支链分子来实现1,4-二酮-吡咯并[3,4-c]吡咯（DPP）衍生物的多态发射有四个外围供体（三苯胺）。所得的D‒A‒D化合物（TIDPP）在溶液中发出黄色光，荧光效率约为。70％的晶体，非晶态以及水悬浮液也表现出令人印象深刻的40-50％的荧光效率，填补了DPP衍生物的ACQ和AIE之间的空白。此外，聚集可以极大地使发射光谱发生红移，并显着增强水性悬浮液中的双光子吸收截面和激发荧光。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。它的晶态和非晶态以及水悬浮液也表现出令人印象深刻的40–50％的荧光效率，填补了DPP衍生物的ACQ和AIE之间的空白。此外，聚集可以极大地使发射光谱发生红移，并显着增强水性悬浮液中的双光子吸收截面和激发荧光。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。它的晶态和非晶态以及水悬浮液也表现出令人印象深刻的40–50％的荧光效率，填补了DPP衍生物的ACQ和AIE之间的空白。此外，聚集可以极大地使发射光谱发生红移，并显着增强水性悬浮液中的双光子吸收截面和激发荧光。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。填补了DPP衍生品的ACQ和AIE之间的空白。此外，聚集可以极大地使发射光谱发生红移，并显着增强水性悬浮液中的双光子吸收截面和激发荧光。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。填补了DPP衍生品的ACQ和AIE之间的空白。此外，聚集可以极大地使发射光谱发生红移，并显着增强水性悬浮液中的双光子吸收截面和激发荧光。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。TIDPP固体还表现出独特的机械变色蓝移发光和值得赞扬的OFET性能，表明存在聚集诱导的分子平面化。这项工作表明合理的支化效应可以操纵聚集体的发射行为并开发出多功能材料。