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Title: Extremely efficient exciton fission and fusion and its dominant contribution to the photoluminescence yield in rubrene single crystals

Measurements of photoluminescence yield over a wide range of excitation power in rubrene single crystals reveal a transition between a low-yield region and a region with a yield more than an order of magnitude larger. This transition occurs at an excitation density of 3 × 10{sup 20} cm{sup −3} absorbed photons per second. This power dependence is predicted in case of an extremely efficient conversion between singlet and triplet excitons through fission and fusion. Triplet fusion starts contributing to rubrene's photoluminescence already at intensities of a few mW/cm{sup 2} at room temperature, corresponding to triplet densities of ∼10{sup 16} cm{sup −3}.
Authors:
;  [1]
  1. Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
Publication Date:
OSTI Identifier:
22253263
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EXCITATION; EXCITONS; MONOCRYSTALS; PHOTOLUMINESCENCE; PHOTONS; TEMPERATURE RANGE 0273-0400 K; TRIPLETS; YIELDS