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Journal Article

Frequency up-conversion as a temperature probe of organic opto- electronic devices

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons48361

Lupton,  J. M.
MPI for Polymer Research, Max Planck Society;

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Lupton, J. M. (2002). Frequency up-conversion as a temperature probe of organic opto- electronic devices. Applied Physics Letters, 80(2), 186-188.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-66AD-3
Abstract
Frequency up-conversion is demonstrated in a polyfluorene-based conjugated polymer. Up-converted emission is observed upon excitation to the red of the 0-0 luminescence band. The emission intensity depends strongly on temperature and provides an accurate probe of the operating temperature of organic light-emitting diodes. Temperature rises of up to 30 K are observed at standard operating current densities of 225 mA/cm(2). Due to the low thermal conductivity and heat capacity of the polymer film, the temperature of the film is found to rise slowly on a time-scale of seconds. Upon termination of the current, the temperature decreases again on a time-scale of minutes. (C) 2002 American Institute of Physics.