DataSheet2_Thermally activated delayed fluorescence and high-contrast mechanochromism of anthrone-based donor–acceptor systems.pdf

The development of materials that emit in the deep-red to near-infrared region of the spectrum has attracted significant attention due to their potential as optical sensing and imaging reagents in biology. Herein, we report the synthesis and optoelectronic characterization of four anthraquinone-based emitters, T-tBuCz-AQ, T-MeOCz-AQ, C-tBuCz-AQ, and C-MeOCz-AQ, and two pyrazoloanthrone-based emitters, tBuCz-PA and DMAC-PA. Depending on the donor, these compounds emit in the spectral range between 640 and 750 nm in the neat film, while the emission of the 10 wt% doped films in poly(methyl methacrylate) (PMMA) is blue-shifted between 600 and 700 nm and has low photoluminescence quantum yields between 2.6% and 6.6%. Of these compounds, T-tBuCz-AQ, T-MeOCz-AQ, and C-tBuCz-AQ exhibited thermally activated delayed fluorescence (TADF) in 10 wt% doped films in PMMA, while the crystals of T-tBuCz-AQ also showed TADF. Compound tBuCz-PA showed a high-contrast and reversible photoluminescence (PL) response upon mechanical grinding and hexane fuming.

在深红至近红外光谱区域发射材料的研究因其作为生物光学传感与成像试剂的潜力而备受瞩目。本研究中，我们报道了四种基于蒽醌的发射体T-tBuCz-AQ、T-MeOCz-AQ、C-tBuCz-AQ和C-MeOCz-AQ，以及两种基于吡唑并蒽酮的发射体tBuCz-PA和DMAC-PA的合成与光电特性表征。这些化合物根据供体不同，在纯净薄膜中发射光谱范围在640至750纳米之间，而在聚甲基丙烯酸甲酯（PMMA）中掺杂10 wt%的薄膜中，其发射光谱向蓝移，介于600至700纳米之间，且具有2.6%至6.6%的低光致发光量子产率。在这些化合物中，T-tBuCz-AQ、T-MeOCz-AQ和C-tBuCz-AQ在PMMA中掺杂10 wt%的薄膜中表现出热激活延迟荧光（TADF），而T-tBuCz-AQ的晶体也显示了TADF现象。化合物tBuCz-PA在机械研磨和六烷蒸汽处理后显示出高对比度和可逆的光致发光（PL）响应。