Pun Andrew B, Lyons Alexandra J, Norris David J
Optical Materials Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
J Chem Phys. 2024 Apr 21;160(15). doi: 10.1063/5.0201417.
Magic-sized nanocrystals (MSNCs) grow via jumps between very specific sizes. This discrete growth is a possible avenue toward monodisperse nanomaterials that are completely identical in size and shape. In spite of this potential, MSNCs have seen limited study and application due to their poor optical properties. Specifically, MSNCs are limited in their range of emission wavelengths and commonly exhibit poor photoluminescence quantum yields (PLQYs). Here, we report silver doping of CdSe MSNCs as a strategy to improve the optical properties of MSNCs. Silver doping leads to controllable shifts in emission wavelength and significant increases in MSNC PLQYs. These results suggest that doped MSNCs are interesting candidates for displays or luminescent solar concentrators. Finally, we demonstrate that the doping process does not affect the magic size of our MSNCs, allowing further photophysical study of this class of nanomaterial.
魔法尺寸的纳米晶体（MSNCs）通过在非常特定的尺寸之间跳跃来生长。这种离散生长是通向尺寸和形状完全相同的单分散纳米材料的一条可能途径。尽管有这种潜力，但由于其光学性能较差，MSNCs的研究和应用有限。具体而言，MSNCs的发射波长范围有限，并且通常表现出较差的光致发光量子产率（PLQYs）。在此，我们报道对CdSe MSNCs进行银掺杂，作为改善MSNCs光学性能的一种策略。银掺杂导致发射波长的可控位移以及MSNCs的PLQYs显著增加。这些结果表明，掺杂的MSNCs是用于显示器或发光太阳能聚光器的有趣候选材料。最后，我们证明掺杂过程不会影响我们MSNCs的魔法尺寸，从而允许对这类纳米材料进行进一步的光物理研究。
