Here, we proposed a novel synthetic technique to get highly luminescent QDs. The thallium ions were used for the first time to modulate the optical behavior of the PbS QDs. High quality Pb_1-xTl_xS QDs were prepared via 1,3,5-tris-N-phenylbenzimidazole-2-yl-benzene assisted hydrothermal technique. The X-ray measurements demonstrated the preserving of cubic phase of PbS nanocrystals. The TEM measurements disclosed the increase of the particle-size of the Pb_1-xTl_xS QD from 4.1 nm to 9 nm. The optical performance of these nanocrystals was modulated through the include of Tl in crystal lattice structure of PbS, where the bandgap decreased from 1.4 eV to 1.24 eV. The Tl-dopant promoted the emission intensity and established color tunable quantum dots. The quantum yield of the Pb_1-xTl_xS QDs increased from 10 to 81 % due to the Tl-dopant. These marvel characteristics may force the developed Pb_1-xTl_xS QDs to be used for the production of laser in IR-region, optical sensors and IR-decoders potential applications.

在这里，我们提出了一种新颖的合成技术来获得高发光QD。the离子首次用于调节PbS QD的光学行为。高质量的Pb _1-x Tl _x S QD通过1,3,5-三-N-苯基苯并咪唑-2-基苯辅助水热技术制备。X射线测量表明，保留了PbS纳米晶体的立方相。TEM测量显示Pb _1-x Tl _x的粒径增加S QD从4.1 nm到9 nm。这些纳米晶体的光学性能通过PbS晶格结构中T1的包含进行调节，其中带隙从1.4 eV降低到1.24 eV。T1掺杂剂提高了发射强度并建立了颜色可调量子点。由于掺Tl ，Pb _1-x Tl _x S QD的量子产率从10％增加到81％。这些奇特的特性可能会迫使已开发的Pb _1-x Tl _x S QD用于红外区域，光学传感器和红外解码器潜在应用中的激光生产。