Spectral properties of resonant-cavity, polyfluorene light-emitting diodes

Fletcher, R. B.; Lidzey, D. G.; Bradley, D. D. C.; Bernius, M.; Walker, S.
August 2000
Applied Physics Letters;8/28/2000, Vol. 77 Issue 9
Academic Journal
We report on the fabrication and device properties of light-emitting resonant cavity conjugated-polymer diodes. The microcavity structures were constructed using a dielectric mirror, an indium-tin-oxide anode, a green light-emitting polyfluorene blend, and a metal (cathode) mirror. The best performance was obtained for a composite calcium-aluminum cathode, that combines high reflectivity with a low workfunction. This structure emitted electroluminescence with a linewidth of 12 nm and a maximum brightness of 300 cd m[sup -2] at a bias of 35 V with an efficiency of 0.95 cd A[sup -1]. © 2000 American Institute of Physics.


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