PbTe colloidal nanocrystals: Synthesis, characterization, and multiple exciton generation
PbTe colloidal nanocrystals: Synthesis, characterization, and multiple exciton generation
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DOI：
10.1021/ja0574973
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发表时间：
2006-03-15
影响因子：
15
通讯作者：
Nozik, AJ
中科院分区：
文献类型：
--
作者：
Murphy, JE;Beard, MC;Nozik, AJ
我们报告的替代合成和胶体PbTe纳米晶体（NC）的第一个光学表征。我们已经合成了球形PbTe NC具有低至7%的尺寸分布，直径范围从2.6至8.3 nm，与第一激子跃迁调谐从1009至2054 nm。还报道了使用PbO“一锅法”合成胶体立方体状PbSe和PbTe NCs的方法。PbTe球形NC的光致发光量子产率被测量为高达52 +/-2%。我们还报告了第一个已知的观察有效的多激子产生（MEG）从单光子吸收的PbTe NC。最后，我们报告计算的纵向和横向玻尔半径PbS，PbSe，和PbTe NC占电子带各向异性。其次是比较这些铅盐的电子能带结构和光学性质的差异。
We report an alternative synthesis and the first optical characterization of colloidal PbTe nanocrystals (NCs). We have synthesized spherical PbTe NCs having a size distribution as low as 7%, ranging in diameter from 2.6 to 8.3 nm, with first exciton transitions tuned from 1009 to 2054 nm. The syntheses of colloidal cubic-like PbSe and PbTe NCs using a PbO "one-pot" approach are also reported. The photoluminescence quantum yield of PbTe spherical NCs was measured to be as high as 52 +/- 2%. We also report the first known observation of efficient multiple exciton generation (MEG) from single photons absorbed in PbTe NCs. Finally, we report calculated longitudinal and transverse Bohr radii for PbS, PbSe, and PbTe NCs to account for electronic band anisotropy. This is followed by a comparison of the differences in the electronic band structure and optical properties of these lead salts.