摘要We report the superior stability of the composite Cs2CO3:Ag/Ag cathode structure, which can be used in efficient organic light-emitting diodes (OLEDs). Devices with the Cs2CO3:Ag (1:10, 5nm)/Ag (95nm) cathode show a considerably improved lifetime compared with the control device with the Cs2CO3 (0.5nm)/Ag (100nm) cathode. The composite Cs2CO3:Ag/Ag film is proved to be stable in the atmosphere. X-ray diffraction (XRD) is applied to analyze the crystalline structure of the Cs2CO3:Ag film, and it is demonstrated that CsAg alloy is formed, leading to the improved stability of the thin film and the devices.
Abstract:We report the superior stability of the composite Cs2CO3:Ag/Ag cathode structure, which can be used in efficient organic light-emitting diodes (OLEDs). Devices with the Cs2CO3:Ag (1:10, 5nm)/Ag (95nm) cathode show a considerably improved lifetime compared with the control device with the Cs2CO3 (0.5nm)/Ag (100nm) cathode. The composite Cs2CO3:Ag/Ag film is proved to be stable in the atmosphere. X-ray diffraction (XRD) is applied to analyze the crystalline structure of the Cs2CO3:Ag film, and it is demonstrated that CsAg alloy is formed, leading to the improved stability of the thin film and the devices.
[1] Tang C W and VanSlyke S A 1987 Appl. Phys. Lett. 51 913 [2] Hung L S, Tang C W and Mason M G 1997 Appl. Phys.Lett. 70 152 [3] Jabbour G E, Kippelen B, Armstrong N R and Peyghambarian N1998 Appl. Phys. Lett. 73 1185 [4] Huang J, Xu Z and Yang Y 2007 Adv. Funct. Mater. 17 1966 [5] Hasegawa T, Miura S, Moriyama T, Kimura T, Takaya I, OsatoY and Mizutani H 2004 SID Int. Symp. Dig. Tech. Pap. 35154 [6] Wu H B, Huang F, Peng J B and Cao Y 2005 Org.Electron. 6 118 [7] Schaer M, N\"uesch F, Berner D, Leo W and Zuppiroli L 2001 Adv. Funct. Mater. 11 116 [8] Liu Q, Duan L, Zhang D Q, Dong G F, Qiao J, Wang L D andQiu Y 2009 Jpn. J. Appl. Phys. 48 020206 [9] Li Y, Zhang D Q, Duan L, Zhang R, Wang L D and Qiu Y 2007 Appl. Phys. Lett. 90 012119 [10] Hall H T, Merrill L and Barnett J D 1964 Science 146 1297