Enhanced Triplet Formation in Polycrystalline Tetracene Films by Femtosecond Optical-Pulse Shaping

Erik M. Grumstrup; Justin C. Johnson; Niels H. Damrauer

doi:10.1103/PhysRevLett.105.257403

Enhanced Triplet Formation in Polycrystalline Tetracene Films by Femtosecond Optical-Pulse Shaping

Erik M. Grumstrup, Justin C. Johnson, Niels H. Damrauer

Chemistry and Nanoscience

University of Colorado Boulder

Research output: Contribution to journal › Article › peer-review

92 Scopus Citations

Abstract

Polycrystalline tetracene films have been explored using weak ∼30fs visible laser pulses that excite the lowest singlet exciton as well as coherent vibrational motion. Transient difference spectra show a triplet absorption which arises following singlet fission (SF) and persists for 1.6 ns without decay. Adaptive pulse shaping identifies multipulse optimal fields which maximize this absorption feature by ∼20%. These are comprised of subpulses separated by time delays well correlated with the period of lattice vibrations suggesting such modes control the yield of SF photochemistry.

Original language	American English
Article number	Article No. 257403
Number of pages	4
Journal	Physical Review Letters
Volume	105
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.105.257403 https://doi.org/10.1103/PhysRevLett.105.257403
State	Published - 16 Dec 2010

NREL Publication Number

NREL/JA-5900-49995

Keywords

excitation
polycrystalline tetracene
thin films

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AB - Polycrystalline tetracene films have been explored using weak ∼30fs visible laser pulses that excite the lowest singlet exciton as well as coherent vibrational motion. Transient difference spectra show a triplet absorption which arises following singlet fission (SF) and persists for 1.6 ns without decay. Adaptive pulse shaping identifies multipulse optimal fields which maximize this absorption feature by ∼20%. These are comprised of subpulses separated by time delays well correlated with the period of lattice vibrations suggesting such modes control the yield of SF photochemistry.

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KW - thin films

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Enhanced Triplet Formation in Polycrystalline Tetracene Films by Femtosecond Optical-Pulse Shaping

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