High efficiency organic light-emitting devices with Al/NaF cathode

Abstract

An organic light-emitting device (OLED) with an Al/NaF (1.5 nm) cathode exhibited a highly enhanced performance comparable to the one with the best Al/LiF cathode. This suggests that NaF can be an alternative to commonly used LiF interlayer for improved OLED performance. Photoelectron spectroscopy studies revealed that the intensity of the gap states and the amount of the valence band shift at Al/NaF/Alq3 interface surpassed those of Al/LiF/Alq3 interface, suggesting that the observed performance improvement is directly related with these features.

Improved performances in top-emitting organic light-emitting diodes based on a semiconductor zinc oxide buffer layer

“…Therefore, a proper electron injection layer (EIL) should be introduced between the cathode and the electron-transporting material for obtaining an effective electron injection. Several sorts of EILs such as a Li-doped Alq 3 layer, a thin Cs layer, and an insulating layer of LiF, CsF, CaF 2 , MgF 2 , NaF, or MgO have been reported to improve electron injection [13,[16][17][18][19][20][21]. However, inorganic semiconductor materials as EILs have not been reported up to now.…”

Effects of Low Workfunction Metal Acetate Layers on the Electroluminescent Characteristics of Organic Light-Emitting Diodes

“…이 밖에도 Al 전극과 유기층의 계면에 metal fluorides(LiF [3], NaF [10], CsF [11]), metal oxides(MgO [12], Al 2 O 3 [13]), organic metal complexes (Ca(acac) 2 [14], NaSt [15] …”

Electroluminescence performance of organic light-emitting devices with KCl inside hole transport layer

“…Thereafter, LiF as a normal buffer layer was widely inserted between the electron transport layer (ETL) and the cathode. Nevertheless, other materials have also been studied for buffer layer to improve the brightness and efficiency of OLEDs, such as NaCl, CsCl and NaF [3][4][5].…”