Up- And down-conversion in molecules and materials

Bruno Ehrler, Nobuhiro Yanai, Lea Nienhaus

    Research output: Contribution to journalReview articlepeer-review

    11 Citations (Scopus)


    This article from the Journal of Chemical Physics termed Up- and Down-Conversion in Molecules and Materials aims to bring together the different ways to convert energy in materials, highlight the common concepts, and define the most promising directions and challenges for future research. Downconversion (DC) describes the conversion of higher-energy particles into single or multiple lower-energy particles. The article highlights examples of singlet fission and lanthanide-based DC systems. Many of the contributions to this article collection focus on singlet fission (SF). The article also shows that in molecules, the particles that carry energy are excitons, and the conversion of exciton energy between a spin-singlet exciton and two spin-triplet excitons can be used for upconversion (UC) or DC. Molecular DC is termed singlet fission (SF), where one singlet exciton is converted into two triplet excitons,1 and molecular UC is termed triplet fusion or triplet–triplet annihilation (TTA), where two spin-triplet excitons combine to form a singlet exciton.

    Original languageEnglish
    Article number070401
    JournalJournal of Chemical Physics
    Issue number7
    Publication statusPublished - Feb 21 2021

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry


    Dive into the research topics of 'Up- And down-conversion in molecules and materials'. Together they form a unique fingerprint.

    Cite this