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Two-Photon Absorption and Two-Photon-Induced Gain in Perovskite Quantum Dots.
Nagamine, Gabriel; Rocha, Jaqueline O; Bonato, Luiz G; Nogueira, Ana F; Zaharieva, Zhanet; Watt, Andrew A R; de Brito Cruz, Carlos H; Padilha, Lazaro A.
Afiliação
  • Nagamine G; Instituto de Fisica "Gleb Wataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165, 13083-859 Campinas , Sao Paulo , Brazil.
  • Rocha JO; Instituto de Fisica "Gleb Wataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165, 13083-859 Campinas , Sao Paulo , Brazil.
  • Bonato LG; Instituto de Quimica, Universidade Estadual de Campinas, UNICAMP , P.O. Box 6154, 13084-971 Campinas , Sao Paulo , Brazil.
  • Nogueira AF; Instituto de Quimica, Universidade Estadual de Campinas, UNICAMP , P.O. Box 6154, 13084-971 Campinas , Sao Paulo , Brazil.
  • Zaharieva Z; Department of Materials , University of Oxford , 16 Parks Road Oxford OX1 3PH , United Kingdom.
  • Watt AAR; Department of Materials , University of Oxford , 16 Parks Road Oxford OX1 3PH , United Kingdom.
  • de Brito Cruz CH; Instituto de Fisica "Gleb Wataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165, 13083-859 Campinas , Sao Paulo , Brazil.
  • Padilha LA; Instituto de Fisica "Gleb Wataghin" , Universidade Estadual de Campinas, UNICAMP , P.O. Box 6165, 13083-859 Campinas , Sao Paulo , Brazil.
J Phys Chem Lett ; 9(12): 3478-3484, 2018 Jun 21.
Article em En | MEDLINE | ID: mdl-29882410
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.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article