Mercury Chalcogenide Nanoplatelet–Quantum Dot Heterostructures as a New Class of Continuously Tunable Bright Shortwave Infrared Emitters
Mercury Chalcogenide Nanoplatelet–Quantum Dot Heterostructures as a New Class of Continuously Tunable Bright Shortwave Infrared Emitters
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汞硫族化物纳米片——量子点异质结构作为新型连续可调明亮短波红外发射器
DOI：
10.1021/acs.jpclett.0c00958
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Caram, Justin R.
中科院分区：
文献类型：
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作者：
Tenney, Stephanie M.;Vilchez, Victoria;Sonnleitner, Mikayla L.;Huang, Chengye;Friedman, Hannah C.;Shin, Ashley J.;Atallah, Timothy L.;Deshmukh, Arundhati P.;Ithurria, Sandrine;Caram, Justin R.
尽管在成像、能量转换和电信中有广泛的应用，但很少有纳米级部分在短波红外（SWIR，1000-2000 nm或1.24-0.62 eV）中有效地发光。我们报道了量子限制的汞硫族化物（HgX，其中X = Se或Te）纳米片（NPL）可以被诱导从附着的量子点（QD）“缺陷”状态发射明亮（QY > 30%）和可调谐（900-1500+ nm）的红外发射。我们证明了从NPL到这些量子点的近单位能量转移，这些量子点完全猝灭NPL发射并通过SWIR发射高QY。该QD缺陷发射是动力学可调的，使得能够从NPL控制中间带隙发射。光谱分辨的光致发光显示出能量依赖的寿命，在相同的光谱窗口中，其辐射速率比PbX类似物快10-20倍。加上它们的高量子产率，在HgX NPL上的中间带隙发射HgX点为SWIR中的新型光电子学提供了潜在的平台。
Despite broad applications in imaging, energy conversion, and telecommunications, few nanoscale moieties emit light efficiently in the shortwave infrared (SWIR, 1000–2000 nm or 1.24–0.62 eV). We report quantum-confined mercury chalcogenide (HgX, where X = Se or Te) nanoplatelets (NPLs) can be induced to emit bright (QY > 30%) and tunable (900–1500+ nm) infrared emission from attached quantum dot (QD) “defect” states. We demonstrate near unity energy transfer from NPL to these QDs, which completely quench NPL emission and emit with a high QY through the SWIR. This QD defect emission is kinetically tunable, enabling controlled midgap emission from NPLs. Spectrally resolved photoluminescence demonstrates energy-dependent lifetimes, with radiative rates 10–20 times faster than those of their PbX analogues in the same spectral window. Coupled with their high quantum yield, midgap emission HgX dots on HgX NPLs provide a potential platform for novel optoelectronics in the SWIR.