Galář Pavel, Popelář Tomáš, Khun Josef, Matulková Irena, Němec Ivan, Newell Kateřina Dohnalova, Michalcová Alena, Scholtz Vladimír, Kůsová Kateřina
Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, Prague 6, 162 00, Czech Republic.
Faraday Discuss. 2020 Jun 19;222(0):240-257. doi: 10.1039/c9fd00092e.
Traditionally, two classes of silicon nanocrystals (SiNCs) are recognized with respect to their light-emission properties. These are usually referred to as the "red" and the "blue" emitting SiNCs, based on the spectral region in which the larger part of their luminescence is concentrated. The origin of the "blue" luminescence is still disputed and is very probably different in different systems. One of the important contributions to the discussion about the origin of the "blue" luminescence was the finding that the exposure of SiNCs to even trace amounts of nitrogen in the presence of oxygen induces the "blue" emission, even in originally "red"-emitting SiNCs. Here, we obtained a different result. We show that the treatment of "red" emitting, already oxidized SiNCs in a water-based environment containing air-related radicals including nitrogen-containing species as well as oxygen, diminishes, rather than induces the "blue" luminescence.
传统上，根据硅纳米晶体（SiNCs）的发光特性可将其分为两类。基于其发光大部分集中的光谱区域，这两类通常被称为“红色”和“蓝色”发光的SiNCs。“蓝色”发光的起源仍存在争议，并且在不同系统中很可能有所不同。关于“蓝色”发光起源的讨论中，一项重要贡献是发现，即使在原本“红色”发光的SiNCs中，在有氧存在的情况下，SiNCs暴露于痕量的氮也会诱导“蓝色”发射。在此，我们得到了不同的结果。我们表明，在含有包括含氮物种以及氧在内的与空气相关自由基的水基环境中，对已经氧化的“红色”发光SiNCs进行处理，会减弱而非诱导“蓝色”发光。
