articleJournal of the American Chemical SocietyMar 3, 2016Closed access

Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers

YXYanqing XuQCQi ChenCZChunfeng ZhangRWRui WangHWHua Wu

Nanjing University · Collaborative Innovation Center of Advanced Microstructures · +7 more institutions

PubMed
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Abstract

Two-photon-pumped lasers have been regarded as a promising strategy to achieve frequency up-conversion for situations where the condition of phase matching required by conventional approaches cannot be fulfilled. However, their practical applications have been hindered by the lack of materials holding both efficient two-photon absorption and ease of achieving population inversion. Here, we show that this challenge can be tackled by employing colloidal nanocrystals of perovskite semiconductors. We observe highly efficient two-photon absorption (with a cross section of 2.7 × 10(6) GM) in toluene solutions of CsPbBr3 nanocrystals that can excite large optical gain (>500 cm(-1)) in thin films. We have succeeded in…

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Topics & keywords

Topics
Keywords
  • Lasing threshold
  • Population inversion
  • Nanocrystal
  • Laser
  • Perovskite (structure)
  • Optoelectronics
  • Absorption (acoustics)
  • Chemistry
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