Two-Photon Absorption and Two-Photon-Induced Gain in Perovskite Quantum Dots,The Journal of Physical Chemistry Letters

当前位置： X-MOL 学术 › J. Phys. Chem. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Two-Photon Absorption and Two-Photon-Induced Gain in Perovskite Quantum Dots
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-06-08 00:00:00 , DOI: 10.1021/acs.jpclett.8b01127
Gabriel Nagamine ₁ , Jaqueline O. Rocha ₁ , Luiz G. Bonato ₂ , Ana F. Nogueira ₂ , Zhanet Zaharieva ₃ , Andrew A. R. Watt ₃ , Carlos H. de Brito Cruz ₁ , Lazaro A. Padilha ₁

Affiliation

Perovskite quantum dots (PQDs) emerged as a promising class of material for applications in lighting devices, including light emitting diodes and lasers. In this work, we explore nonlinear absorption properties of PQDs showing the spectral signatures and the size dependence of their two-photon absorption (2PA) cross-section, which can reach values higher than 10⁶ GM. The large 2PA cross section allows for low threshold two-photon induced amplified spontaneous emission (ASE), which can be as low as 1.6 mJ/cm². We also show that the ASE properties are strongly dependent on the nanomaterial size, and that the ASE threshold, in terms of the average number of excitons, decreases for smaller PQDs. Investigating the PQDs biexciton binding energy, we observe strong correlation between the increasing on the biexciton binding energy and the decreasing on the ASE threshold, suggesting that ASE in PQDs is a biexciton-assisted process.

中文翻译：

钙钛矿量子点中的两个光子吸收和两个光子诱导的增益

钙钛矿量子点（PQD）成为一类有前途的材料，可用于照明设备，包括发光二极管和激光器。在这项工作中，我们探索了PQD的非线性吸收特性，这些特性显示了其两个光子吸收（2PA）截面的光谱特征和尺寸依赖性，其值可以达到10 ⁶ GM以上。大的2PA横截面允许低阈值的双光子感应放大自发发射（ASE），其低至1.6 mJ / cm ²。我们还表明，ASE性质强烈依赖于纳米材料的尺寸，并且对于较小的PQD，ASE阈值（就激子的平均数量而言）会降低。研究PQDs的双激子结合能，我们发现双激子结合能的增加与ASE阈值的降低之间有很强的相关性，这表明PQDs中的ASE是双激子辅助过程。

更新日期：2018-06-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11