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Colloidal Spherical Quantum Wells with Near-Unity Photoluminescence Quantum Yield and Suppressed Blinking

机译:具有接近单位的光致发光量子产率和抑制闪烁的胶体球形量子阱

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摘要

Thick inorganic shells endow colloidal nanocrystals (NCs) with enhanced photochemical stability and suppression of photoluminescence intermittency (also known as blinking). However, the progress of using thick-shell 100 90 heterostructure NCs in applications has been limited due to the low photoluminescence quantum yield (PL QY <= 60%) at room temperature. Here, we demonstrate thick-shell NCs with CdS/CdSe/CdS seed/spherical quantum well/shell (SQW) geometry that exhibit near-unity PL QY at room temperature and suppression of blinking. In SQW NCs, the lattice mismatch is diminished between the emissive CdSe layer and the surrounding CdS layers as a result of coherent strain, which suppresses the formation of misfit defects and consequently permits, similar to 100% PL QY for SQW NCs with a thick CdS shell (>5 nm). High PL QY of thick-shell SQW NCs is preserved even in concentrated dispersion and in film under thermal stress, which makes them promising candidates for applications in solid-state concentrators.
机译:厚的无机壳赋予胶体纳米晶体(NCs)增强的光化学稳定性,并抑制了光致发光的间歇性(也称为闪烁)。但是,由于在室温下光致发光的量子产率低(PL QY <= 60%),因此在应用中使用厚壳100 90异质结构NC的进展受到了限制。在这里,我们演示了具有CdS / CdSe / CdS种子/球形量子阱/壳(SQW)几何形状的厚壳NC,它们在室温下表现出接近统一的PL QY并抑制眨眼。在SQW NC中,由于相干应变,在发射CdSe层和周围的CdS层之间的晶格失配得以减少,这抑制了失配缺陷的形成,因此允许,类似于具有厚CdS的SQW NC的100%PL QY壳(> 5 nm)。厚壳SQW NC的高PL QY甚至在浓缩分散液和热应力下的薄膜中也能保持,这使其成为固态浓缩器应用的有希望的候选者。

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