Abstract
The rapid development of organic optoelectronic devices such as organic photovoltaics (OPVs) and organic light-emitting devices (OLEDs) is largely attributable to their advantageous properties of their large area, ultrathin thickness, flexiblility, transparency, and solution processability. Herein, we fabricate and characterize a dual mode OPV-OLED device with three-terminal structure comprising a polymer-based bulk-heterojunction inverted OPV unit and a top-emission white phosphorescent OLED unit back-to-back connected via intermediate metal alloy electrode. Sputter-deposited indium tin oxide was used as a transparent cathode of the inverted OPV unit, whereas Ag-doped Al served as a common OPV/OLED anode, allowing the decoupling of electricity generation and light mission functions. Notably, the doping of Al by Ag facilitated the reduction of surface roughness, allowing the above electrode to be used as a common anode and dramatically reducing the leakage current. Finally, the top-emission OLED unit featured an ultrathin layer of Ag-doped Mg as a semitransparent cathode. Thus, successful integration of the OPV-OLED elements results in the decoupling of electricity generation and light emission functionalities, achieving a power conversion efficiency of 3.4% and an external quantum efficiency of 9.9%.
Highlights
Organic optoelectronic devices such as organic photovoltaics (OPVs)[1,2,3] and organic light-emitting devices (OLEDs)[4,5,6] have attracted considerable attention due to exhibiting the advantages of large area, ultrathin, flexibility, transparency, and solution processability
To decoupled electricity generation and light emission function, we fabricated a dual mode OPV-OLED device with three terminal structure featuring a polymer-based bulk-heterojunction inverted OPV unit and a top-emission white phosphorescent OLED unit back-to-back connected via an intermediate metal alloy electrode Sputter-deposited indium tin oxide (ITO) with relatively high transmittance was used as the transparent cathode of the inverted OPV unit
The OPV unit was irradiated by solar light from the transparent ITO–coated glass side, whereas OLED–emitted light passed through the semitransparent ultrathin Ag-doped Mg cathode
Summary
Organic optoelectronic devices such as organic photovoltaics (OPVs)[1,2,3] and organic light-emitting devices (OLEDs)[4,5,6] have attracted considerable attention due to exhibiting the advantages of large area, ultrathin, flexibility, transparency, and solution processability. In tandem OLEDs, developed to simultaneously achieve high efficiency and long operational lifetime, multiple light-emitting units are connected in series via a charge generation layer (CGL)[25,26,27,28]. The integration of OPVs and OLEDs in a series-connected directory has led to development of new functional devices, e.g., those used for light upconversion and infrared sensing device[32,33,34,35]. To decoupled electricity generation and light emission function, we fabricated a dual mode OPV-OLED device with three terminal structure (active are = 1 cm2) featuring a polymer-based bulk-heterojunction inverted OPV unit and a top-emission white phosphorescent OLED unit back-to-back connected via an intermediate metal alloy electrode Sputter-deposited indium tin oxide (ITO) with relatively high transmittance (up to 90%) was used as the transparent cathode of the inverted OPV unit. Ultrathin Ag-doped Mg was used as a semitransparent cathode for the top-emission OLED unit, and the fabricated dual mode device exhibited a PCE of 3.4% and an EQE of 9.9%
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