POLYMERIC ELECTROLUMINESCENT DEVICE AND METHOD FOR PREPARING SAME
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United States of America Patent
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Nov 13, 2014
app pub date -
Nov 28, 2011
filing date -
Nov 28, 2011
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Abstract
The present invention relates to a polymeric electroluminescent device and a method for preparing the same. The device comprises a conductive anode substrate, a hole injecting layer, a hole transportation layer, an electron barrier layer, a light-emitting layer, an electron transportation layer, an electron injecting layer and a cathode laminated in succession, and the material for the electron barrier layer is one selected from lithium fluoride, lithium carbonate, lithium oxide and lithium chloride. By preparing lithium compound as an inorganic electron barrier layer, the polymeric electroluminescent device is made of cheap materials which are easily obtainable, and most importantly has a low work function of approximately 2.0 eV, which can form a transition potential barrier of approximately 1.0 eV with the light-emitting layer and can limit the recombination of electrons and holes as far as possible, thereby increasing the recombination possibility of excitons and in turn improving the light-emitting efficiency of the polymeric electroluminescent device.
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