Improved performance and stability of organic light-emitting devices with silicon oxy-nitride buffer layer

Abstract

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Performance enhancement of organic light-emitting diode by heat treatment

“…ITO-coated glass substrates with a sheet resistance of 30 O/square were sequentially cleaned, dried and UV ozone treated [17]. The substrates were then loaded into an ultra high vacuum (UHV) thermal evaporation chamber with a base pressure better than 9 Â 10 À7 Torr.…”

“…Mason et al have reported that the ITO contact to the NPB layer can be significantly modified via substrate pretreatment such as oxygen plasma or prolonged UVO treatments [14,15]. Hung et al [16] and Poon et al [17] improved the stability by modifying the anode/HTL interface with a layer of CF x and SiO x N y , respectively. Gao et al [8] improved the stability by using an evaporable fluoro-molecule as an anode buffer layer.…”

Organic Semiconductor Electroluminescent Materials

“…A thin insulating layer inserted between ITO and HTL has also been discovered to enhance the hole injection effectively, which is often called a buffer layer such as SiO 2 [18], SiO x N y [19], Teflon [20], LiF [21], and TiO 2 [22]. With an optimum thickness, such a buffer layer can reduce the operating voltage and improve the performance.…”

Enhanced brightness and efficiency in organic light-emitting diodes using SiO2 as buffer layer and electron-blocking layer

“…Insertion of a buffer layer or charge carriers blocking layer is an efficient method to improve the performance of OLEDs. Poon et al [3] used a silicon oxynitride (SiO x N y ) and Qiu et al [4] used Teflon as an anode buffer layer to reduce the turn-on voltage and to increase the efficiency.…”

“…It is widely recognized that unbalanced charge carriers lead to reduced efficiency of OLEDs. Much effort has been made to improve the balance of holes and electrons injected to the emitter layer [1][2][3][4][5]. Insertion of a buffer layer or charge carriers blocking layer is an efficient method to improve the performance of OLEDs.…”