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Enhancement of electron injection in polymer light-emitting diodes with a supramolecular insulating nanolayer on the bottom cathode

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7 Author(s)
Cho, Jeong Ho ; Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea ; Lee, Hwa Sung ; Jang, Yunseok ; Lee, Yongkyun
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With the aim of enhancing the electron injection of a polymer light-emitting diode (PLED), a supramolecular insulating nanolayer that reacts with the cathode (Ag) was inserted between the bottom cathode and the emitting material. The PLED threshold voltage (for 1 cd/m2) was found to decrease from 5.6 to 4.2 V as a result of the introduction of the nanolayer. Synchrotron radiation photoelectron spectroscopy results show that inserting the supramolecular insulating nanolayer results in a decrease in the work function of about 0.7 eV. This reduction lowers the electron injection barrier and produces an increase in the luminance.

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Applied Physics Letters  (Volume:89 ,  Issue: 8 )