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Bulk Heterojunction Upconversion Thin Films Fabricated via One-Step Solution Deposition.

Manchen HuEmma BelliveauYilei WuPournima NarayananDemeng FengRabeeya HamidNatalia MurriettaGhada H AhmedMikhail A KatsDaniel N Congreve
Published in: ACS nano (2023)
Upconversion of near-infrared light into the visible has achieved limited success in applications due to the difficulty of creating solid-state films with high external quantum efficiency (EQE). Recent developments have expanded the range of relevant materials for solid-state triplet-triplet annihilation upconversion through the use of a charge-transfer state sensitization process. Here, we report the single-step solution-processed deposition of a bulk heterojunction upconversion film using organic semiconductors. The use of a bulk heterojunction thin film enables a high contact area between sensitizer and annihilator materials in this interface-triplet-generation mechanism and allows for a facile single-step deposition process. Demonstrations of multiple deposition and patterning methods on glass and flexible substrates show the promise of this materials system for solid-state upconversion applications.
Keyphrases
  • solid state
  • energy transfer
  • quantum dots
  • photodynamic therapy
  • visible light
  • solar cells
  • room temperature
  • perovskite solar cells
  • reduced graphene oxide
  • machine learning
  • gold nanoparticles
  • carbon nanotubes