HUANG Yong-hui, LI Hong-jian, DAI Guo-zhang, XIE Qiang, PAN Yan-zhi, DAI Xiao-yu. Performance Enhancement by Modification of Cathode with a Thin LiF Layer in OELDs[J]. Chinese Journal of Luminescence, 2005,26(6): 737-742
HUANG Yong-hui, LI Hong-jian, DAI Guo-zhang, XIE Qiang, PAN Yan-zhi, DAI Xiao-yu. Performance Enhancement by Modification of Cathode with a Thin LiF Layer in OELDs[J]. Chinese Journal of Luminescence, 2005,26(6): 737-742DOI:
A model for inorganic semiconductor has been presented to calculate the
J-V
characteristics of organicelectroluminescent devices(OELDs).The additional dipole energy introduced by inserting a thin LiF layer at metal/organic interface significantly decreases the potential barrier for electrons injection and the turn-on voltage of OELD.The charge carriers injection has been balanced
and then the performance of OELD has been greatly enhanced.Bydetailed numerical calculation
it has been found that the optimal thickness of inserted LiFshould be in the range of 1.5~5.0 nm
too thick or too thin LiFwill increase the turn-on voltage of OELD and degrade its performance.It hasbeen proved that this model is proper to explain the performance enhancement of OELDs via modification of electrodewith LiF.