Visualization of trap dilution in polyfluorene based light-emitting diodes | Zendy

Elham Khodabakhshi | Zendy; Jasper J. Michels | Zendy; Paul W. M. Blom | Zendy

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Visualization of trap dilution in polyfluorene based light-emitting diodes

Author(s) -

Elham Khodabakhshi,

Jasper J. Michels,

Paul W. M. Blom

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4995381

Subject(s) - polyfluorene , trap (plumbing) , dilution , materials science , polystyrene , diode , oled , spontaneous emission , photochemistry , photoluminescence , trapping , band gap , optoelectronics , polymer , analytical chemistry (journal) , chemistry , optics , copolymer , physics , nanotechnology , laser , organic chemistry , ecology , layer (electronics) , biology , meteorology , composite material , thermodynamics

The effects of electron trapping and resulting trap-assisted recombination can be strongly suppressed by diluting a semiconducting polymer with a large band gap polymer such as polystyrene. Polyfluorene (PFO)-based light-emitting diodes (PLEDs) are an excellent model system to visualize this trap dilution effect. The blue emission from the pristine PFO backbone is accompanied by a broad, featureless green emission band originating from monomeric ketone defects that act as an electron trap. We demonstrate that the green emission from radiative trap-assisted recombination at these ketone defects is nearly eliminated upon dilution. The ratio between bimolecular blue emission and trap-assisted green emission as a function of dilution is shown to be in quantitative agreement with model predictions

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