Determination of the Single-Exciton Two-Photon Absorption Cross Sections of Semiconductor Nanocrystals through the Measurement of Saturation of Their Two-Photon-Excited Photoluminescence,ACS Photonics

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Determination of the Single-Exciton Two-Photon Absorption Cross Sections of Semiconductor Nanocrystals through the Measurement of Saturation of Their Two-Photon-Excited Photoluminescence
ACS Photonics ( IF 6.5 ) Pub Date : 2020-02-20 , DOI: 10.1021/acsphotonics.9b01820
Victor Krivenkov ₁ , Pavel Samokhvalov ₁ , Daria Dyagileva ₁ , Alexander Karaulov ₂ , Igor Nabiev _{1,

2,

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Affiliation

Conventional approaches to the determination of the two-photon absorption cross-section (TPACS) of fluorescent semiconductor nanocrystals, including quantum dots (QDs) and nanoplatelets (NPLs), cannot be applied to samples with unknown concentrations and low optical densities and may be inaccurate in the case of multiexciton nanocrystal excitation. Here, we have studied the two-photon-excited photoluminescence saturation in QD and NPL samples and propose a novel technique for determining of their TPACS from the parameters of this process. The technique allows the measurement of the TPACSs of single exciton states in the samples of unknown concentration, as well as in thin films with ultralow optical densities. The calculated values agreed with the results obtained by conventional methods. The new technique paves new ways to studying small amounts of fluorescent nanocrystals of unknown quantity under two-photon excitation.

中文翻译：

通过测量其双光子激发光致发光的饱和度来确定半导体纳米晶体的单激子双光子吸收截面

确定荧光半导体纳米晶体（包括量子点（QD）和纳米片（NPL））的双光子吸收截面（TPACS）的常规方法无法应用于未知浓度和低光密度的样品，并且可能不准确在多激子纳米晶体激发的情况下。在这里，我们研究了QD和NPL样品中的两个光子激发的光致发光饱和度，并提出了一种从该过程的参数确定其TPACS的新技术。该技术可以测量未知浓度的样品以及具有超低光学密度的薄膜中单激子态的TPACS。计算值与通过常规方法获得的结果一致。

更新日期：2020-02-21

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