Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 34, Pages 5452-5461Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201501537
Keywords
dimers; pentacenes; singlet fission; triplet-triplet annihilation; vibrational relaxation
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Funding
- Singapore MOE Tier 3 grant [MOE2014-T3-1-004]
- A*STAR Singapore
- EPSRC [EP/G060738/1]
- Engineering and Physical Sciences Research Council [EP/M005143/1, EP/G060738/1] Funding Source: researchfish
- EPSRC [EP/G060738/1, EP/M005143/1] Funding Source: UKRI
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Fast and highly efficient intramolecular singlet exciton fission in a pentacene dimer, consisting of two covalently attached, nearly orthogonal pentacene units is reported. Fission to triplet excitons from this ground state geometry occurs within 1 ps in isolated molecules in solution and dispersed solid matrices. The process exhibits a sensitivity to environmental polarity and competes with geometric relaxation in the singlet state, while subsequent triplet decay is strongly dependent on conformational freedom. The near orthogonal arrangement of the pentacene units is unlike any structure currently proposed for efficient singlet exciton fission and may lead to new molecular design rules.
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