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首页> 外文会议>Symposium on Microcrystalline and Nanocrystalline Semiconductors-1998 held November 30-December 3, 1998, Boston, Massachusetts, U.S.A. >Strong photoluminescence in the near-infrared from colloidally-prepared HgTe nanocrystals
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Strong photoluminescence in the near-infrared from colloidally-prepared HgTe nanocrystals

机译：胶体制备的HgTe纳米晶体在近红外中的强光致发光

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摘要

We report here the first measurement of strong near-infrared room temperature photoluminescence (PL) from colloidally-prepared HgTe nanocrystals. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) measurements indicate that the nanoparticles are in the cubic coloradoite phase, with a diameter of approximately 4 nm. The absorption spectrum shows a pronounced electronic transition in the near-infrared, and the broad PL appears to consist of several overlapping features between 800 and 1400 nm with a peak at 1080 nm, which represent a dramatic shift from bulk HgTe behaviour. The quantum efficiency (QE) of the freshly prepared sample is around 50percent, which is among the highest ever reported for a nanocrystalline material. Over a period of several days, the luminescence shifts further into the infrared yielding more dominant longer wavelength features. The observations of this strong infrared luminescence makes this material a promising candidate for application in optical telecommunication systems.
机译：我们在这里报告了从胶体制备的HgTe纳米晶体产生的强近红外室温光致发光（PL）的首次测量。 X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）的测量结果表明，纳米粒子处于立方色辉石相中，直径约为4 nm。吸收光谱显示了近红外的明显电子跃迁，宽的PL似乎由800至1400 nm之间的几个重叠特征组成，在1080 nm处有一个峰，这代表了从大量HgTe行为的显着转变。新鲜制备的样品的量子效率（QE）约为50％，这是有史以来纳米晶体材料中最高的。在几天的时间里，发光进一步移向红外，从而产生了更主要的较长波长特征。对这种强红外发光的观察使该材料成为光通信系统中应用的有希望的候选者。

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