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Antenna Doping: The Key for Achieving Efficient Optical Wavelength Conversion in Crystalline Chromophoric Heterolayers
Author(s) -
Haldar Ritesh,
Chen Hongye,
Mazel Antoine,
Chen DongHui,
Gupta Gaurav,
Dua Navneet,
Diring Stéphane,
Odobel Fabrice,
Wöll Christof
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202100262
Subject(s) - materials science , dopant , optoelectronics , doping , energy conversion efficiency , stacking , antenna (radio) , layer (electronics) , fabrication , nanotechnology , optics , telecommunications , computer science , physics , alternative medicine , nuclear magnetic resonance , pathology , medicine
High‐yield wavelength conversion is one of the key requirements for efficient photon energy harvesting. Attempts to realize efficient conversion by simply stacking layers of chromophores have failed so far, even when using highly crystalline assemblies and employing the recently discovered long‐range (>100 nm) Förster resonance energy transfer (LR‐FRET). Optical conversion efficiency is drastically improved using chromophoric metal–organic framework heterolayers fabricated layer‐by‐layer in connection with an “antenna doping” strategy. Systematic investigations reveal that the LR‐FRET mechanism, reported previously in chromophoric aggregates, is highly anisotropic for neat materials but can be made more isotropic by employing doping strategies. Using optimized fabrication parameters and dopant concentrations, a three‐layer, two‐step cascade with an overall optical conversion efficiency of ≈75% is realized.