Gray Victor, Zhang Zhilong, Dowland Simon, Allardice Jesse R, Alvertis Antonios M, Xiao James, Greenham Neil C, Anthony John E, Rao Akshay
Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, U.K.
Ångström Laboratory, Department of Chemistry, Uppsala University, Box 523, 751 20 Uppsala, Sweden.
J Phys Chem Lett. 2020 Sep 3;11(17):7239-7244. doi: 10.1021/acs.jpclett.0c02031. Epub 2020 Aug 20.
Triplet energy transfer between inorganic quantum dots (QDs) and organic materials plays a fundamental role in many optoelectronic applications based on these nanocomposites. Attaching organic molecules to the QD as transmitter ligands has been shown to facilitate transfer both to and from QDs. Here we show that the often disregarded thiol anchoring group can achieve quantitative triplet energy transfer yields in a PbS QD system with 6,11-bis[(triisopropylsilyl)ethynyl]tetracene-2-methylthiol (TET-SH) ligands. We demonstrate efficient triplet transfer in a singlet fission-based photon multiplication system with 5,12-bis[(triisopropylsilyl)ethynyl]tetracene generating triplets in solution that transfer to the PbS QDs via the thiol ligand TET-SH. Importantly, we demonstrate the increased thermal stability of the PbS/TET-SH system, compared to the traditional carboxylic acid counterpart, allowing for higher photoluminescence quantum yields.
无机量子点（QD）与有机材料之间的三线态能量转移在许多基于这些纳米复合材料的光电子应用中起着至关重要的作用。已表明将有机分子作为发射体配体连接到量子点上有助于实现与量子点之间的能量转移。在此我们表明，在具有6,11-双[（三异丙基甲硅烷基）乙炔基]并四苯-2-甲硫醇（TET-SH）配体的PbS量子点体系中，常被忽视的硫醇锚定基团能够实现定量的三线态能量转移产率。我们在基于单线态裂变的光子倍增系统中证明了有效的三线态转移，其中5,12-双[（三异丙基甲硅烷基）乙炔基]并四苯在溶液中产生三线态，通过硫醇配体TET-SH转移到PbS量子点上。重要的是，我们证明了与传统的羧酸对应物相比，PbS/TET-SH体系具有更高的热稳定性，从而允许更高的光致发光量子产率。
