Investigation of donor/acceptor interactions toward high-performance organic near-infrared (NIR) lasers beyond 900 nm

施主（D）和受主（A）相互作用已被证明是使发射红移的有效策略，但通常不优选用于激光。我们的工作目的是为了实现高性能的近红外（NIR）有机激光器，澄清和操纵的D-A相互作用。在这一年中，我们构建了一个强有力的D-spacer-A分子骨架，通过取代D/A片段，插入各种功能性间隔区，设计了几个分子。对于三苯胺（TPA）/苯并[1，2-c：4，5c ']双[1，2，5]噻二唑（BBTD）结构，我们通过密度泛函理论计算，对它们的物理性质进行了理论预测，并合成了具有应用前景的分子。初步评价了两种D-A-D型分子的物理性质和激光性能，发现两种具有不同给体结构的分子在甲苯中均表现出近红外发射，相应的发射峰位于790 nm附近。这两个分子表现出良好的光致发光量子产率（PLQYs）在混合固态薄膜，相对较快的辐射速率，和有前途的放大自发辐射（ASE）/激光性能。到目前为止，一个前景的论文，其中包括有机激光染料从紫外到近红外，在有机激光三重态操纵的见解，和先进的光学谐振器，已被接受。此外，JSAP 2023年春季会议的口头陈述已经完成。

Donor (D) and acceptor (A) interactions have been evidenced as an effective strategy to redshift emission, but are commonly not preferred for lasing. The purpose of our work is to clarify and manipulate the D-A interactions for realizing high performance near-infrared (NIR) organic lasers. In this year, we built up a strong D-spacer-A molecular skeleton,several molecules have been designed by substituting D/A fragments, and inserting various functional spacers. For triphenylamine (TPA)/benzo[1,2-c:4,5c’]bis[1,2,5]thiadiazole (BBTD) based structure, we have theoretically predicted the photophysical properties by density functional theory calculation and synthesized the promising molecules. The photophysical properties and lasing performance have been initially evaluated, two D-A-D type molecules with different donor moieties exhibited NIR emission in toluene, the corresponding wavelength peaks were around 790 nm. These two molecules showed good photoluminescence quantum yields (PLQYs) in blend solid-state films, relatively fast radiative rates, and promising amplified spontaneous emission (ASE)/lasing performance. Up to now, one Perspective paper, which includes the organic lasing dyes from ultraviolet to NIR, insights of triplet manipulation in organic lasing, and advanced optical resonators, has been accepted. Also, one oral prsentation in JSAP spring 2023 conference has been finished.