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A highly emissive AIE-active luminophore exhibiting deep-red to near-infrared piezochromism and high-quality lasing
Chemical Science ( IF 8.4 ) Pub Date : 2020-04-03 , DOI: 10.1039/d0sc01095b
Chunyan Lv 1, 2, 3, 4 , Wangwang Liu 4, 5, 6 , Qing Luo 1, 2, 3, 4 , Haiyan Yi 1, 2, 3, 4 , Huakang Yu 4, 5, 6 , Zhongmin Yang 4, 5, 6 , Bo Zou 4, 7, 8, 9, 10 , Yujian Zhang 1, 2, 3, 4
Affiliation  

Further development of high-efficiency and low-cost organic fluorescent materials is intrinsically hampered by the energy gap law and spin statistics, especially in the near-infrared (NIR) region. Here we design a novel building block with aggregation-induced emission (AIE) activity for realizing highly efficient luminophores covering the deep-red and NIR region, which originates from an increase in the orbital overlap and electron-withdrawing ability. An organic donor–acceptor molecule (BPMT) with the building block is prepared and can readily form J-type molecular columns with multiple C–H⋯N/O interactions. Notably, such synthesized materials can emit fluorescence centered at 701 nm with extremely high photoluminescence quantum yields (PLQYs) of 48.7%. Experimental and theoretical investigations reveal that the formation of the hybridized local and charge-transfer (HLCT) state and substantial C–H⋯N/O interactions contribute to a fast radiative decay rate and a slow nonradiative decay rate, respectively, resulting in high PLQYs in the solid state covering the NIR range. Remarkably, such BPMT crystals, as a first example, reveal strong-penetrability piezochromism along with a distinct PL change from the deep-red (λmax = 704 nm) to NIR (λmax = 821 nm) region. Moreover, such typical AIE-active luminophores are demonstrated to be a good candidate as a lasing medium. Together with epoxy resin by a self-assembly method, a microlaser is successfully illustrated with a lasing wavelength of 735.2 nm at a threshold of 22.3 kW cm−2. These results provide a promising approach to extend the contents of deep-red/NIR luminophores and open a new avenue to enable applications ranging from chemical sensing to lasing.

中文翻译:

高发射AIE活性发光体,具有深红色至近红外压致变色现象,并具有高质量的激光发射

能隙定律和自旋统计,尤其是在近红外(NIR)区域,本质上阻碍了高效,低成本有机荧光材料的进一步发展。在这里,我们设计了一种具有聚集诱导发射(AIE)活性的新型构件,以实现覆盖深红色和NIR区域的高效发光体,其起源于轨道重叠和电子吸收能力的提高。有机供体-受体分子(BPMT)与结构单元一起制备,可以很容易地形成具有多个C–H⋯N / O相互作用的J型分子柱。值得注意的是,这样的合成材料可以发射以701nm为中心的荧光,并且具有48.7%的极高的光致发光量子产率(PLQYs)。实验和理论研究表明,混合的局部和电荷转移(HLCT)状态的形成以及大量的C–H⋯N / O相互作用分别导致快速的辐射衰变速率和缓慢的非辐射衰变速率,从而导致高PLQY以固态覆盖NIR范围。值得注意的是,这样的BPMT晶体,作为第一示例,揭示强渗透性压致变色从深红色(明显的PL变化沿λ最大= 704纳米)到近红外(λmax = 821 nm)区域。而且,已证明这种典型的具有AIE活性的发光体是激光介质的良好候选者。通过自组装方法将环氧树脂与环氧树脂一起成功地说明了激光波长为735.2 nm,阈值为22.3 kW cm -2的微激光。这些结果提供了一种有前途的方法,可以扩展深红色/ NIR发光体的含量,并开辟一条新途径,以实现从化学传感到激光的应用。
更新日期:2020-04-24
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