Two-Photon Absorption and Two-Photon-Induced Gain in Perovskite Quantum Dots

Autor(es)

Nagamine, Gabriel ^[1] ; Rocha, Jaqueline O. ^[1] ; Bonato, Luiz G. ^[2] ; Nogueira, Ana F. ^[2] ; Zaharieva, Zhanet ^[3] ; Watt, Andrew A. R. ^[3] ; de Brito Cruz, Carlos H. ^[1] ; Padilha, Lazaro A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, POB 6165, BR-13083859 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Quim, POB 6164, BR-13084971 Campinas, SP - Brazil

^[3] Univ Oxford, Dept Mat, 16 Parks Rd, Oxford OX1 3PH - England

• Tipo de documento: Artigo Científico
• Fonte: Journal of Physical Chemistry Letters; v. 9, n. 12, p. 3478-3484, JUN 21 2018.
• Citações Web of Science: 18

Resumo

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/cm(2). 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. (AU)

• Processo FAPESP: 13/16911-2 - Espectroscopia avançada em novos nanomateriais
• Beneficiário: Lázaro Aurélio Padilha Junior
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores