When functionalised with amines, silicon nanocrystals (SiNCs) are known to have surface-state emission with loss of colour tunability, low quantum yield and short nanosecond lifetimes. These changes in optical properties are produced by direct amine bonding on the silicon surface. In this article, secondary amine functionalised SiNCs with bright, red (λ_max = 750 nm) and long-lived emission (τ ca. 50 μs) are reported for the first time via a three-step synthetic approach. These SiNCs are colloidally stable in several polar solvents and can be further functionalised by reaction with carboxylic acid groups. We proved the feasibility of further functionalization with pyrene butyric acid: ca. 40 pyrene units per nanoparticle were attached via amide bond formation. The resulting hybrid system works as a light-harvesting antenna: excitation of pyrene units at 345 nm results in sensitised emission at 700 nm by the silicon core.

中文翻译：

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胺官能化的硅纳米晶体，具有亮红色和长寿命发射。

已知当用胺官能化时，硅纳米晶体（SiNC）具有表面态发射，并且失去了颜色可调性，量子产率低，纳秒寿命短。这些光学性质的变化是通过在硅表面上直接胺键合产生的。在本文中，仲胺官能SiNCs明亮，红色（λ_最大= 750纳米）和长寿命发射（τ约为50微秒）报道首次通过三个步骤的合成方法。这些SiNC在几种极性溶剂中是胶体稳定的，并且可以通过与羧酸基团反应而进一步官能化。事实证明，我们用芘丁酸进一步官能化的可行性：约每个纳米颗粒有40个formation单元通过酰胺键形成。最终的混合系统可作为光收集天线：在345 nm处激发excitation单元会导致硅核在700 nm处发生敏化发射。