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

Lupton, John M.
January 2002
Applied Physics Letters;1/14/2002, Vol. 80 Issue 2, p186
Academic Journal
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/cm2. 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. © 2002 American Institute of Physics.


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