Mechanism of charge generation in p-type doped layer in the connection unit of tandem-type organic light-emitting devices

Abstract

Articles you may be interested inA plasmonically enhanced charge generation layer for tandem organic light emitting device Appl. Phys. Lett. 102, 043303 (2013); 10.1063/1.4789979Effect of organic bulk heterojunction as charge generation layer on the performance of tandem organic lightemitting diodes

Growth and characterization of thin Cu-phthalocyanine films on MgO(001) layer for organic light-emitting diodes

“…Different chemical and physical treatments have been investigated to control the work function of an anode ITO electrode. In order to control efficiently the charge injection and transport in OSC devices, a novel approach by introducing a thin oxide layer between an anode and a hole-transport layer (HTL) in organic light-emitting diodes (OLEDs) has gotten considerable attentions recently [2-4]. After the first report of the role of ITO as a charge generation layer (CGL) [5], several other studies followed to demonstrate the effect of CGL based on oxide films, such as MoO 3 [6], V 2 O 5 [7], and WO 3 [1].…”

High-Contrast Tandem Organic Light-Emitting Devices Employing Semitransparent Intermediate Layers of LiF/Al/C60

“…20 The EL spectra of Devices 4 and 5 are also shown in Figure 4a, displaying two different peaks around 435 nm and 610 nm and which are in good agreement with the EL spectra of NPB and DCM1 molecules, respectively. 21,22 Based on the results of Figure 4a, two new OLEDs were fabricated, namely, 15 a conventional high-contrast OLED (Device 6) and a highcontrast tandem OLED (Device 7), which are shown in Figure 4b and Figure 4c, respectively, together with their corresponding EL spectra. For Device 6, light emission from only NPB is observed, indicating that the PT layer cannot generates photons, whereas, 20 for Device 7, light emission from both the DCM1 and NPB layers are observed simultaneously, as evident from its two-peak spectrum.…”

Efficiency enhancement utilizing hybrid charge generation layer in tandem organic light-emitting diodes

“…1,2 Tandem structure, which consists of several vertically stacked electroluminescent (EL) units connected by intermediate charge generation layer (CGL), has been employed to achieve OLEDs simultaneously with high luminous efficiency and long lifetime. [3][4][5][6][7][8][9][10][11][12][13][14][15] Typical CGL can be formed by conductive layer, 3-5 organic heterojunction, [6][7][8][9] or the combination of n-doped organic and metal oxide layers. [10][11][12][13][14][15] The charge generation and charge separation in CGL are the critical issues in tandem OLEDs, whose mechanism have been extensively discussed.…”