An alternative composite electrode for efficient organic light-emitting diodes
Considering a device structure consisting of multi-stacked layers with different refractive indices, we proposed a composite electrode to diminish total internal reflection, thereby improving the out-coupling efficiency of organic light-emitting diodes (OLEDs). The selected transparent conducting ox...
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Published in | Organic electronics Vol. 85; p. 105844 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.10.2020
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Subjects | |
Online Access | Get full text |
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Summary: | Considering a device structure consisting of multi-stacked layers with different refractive indices, we proposed a composite electrode to diminish total internal reflection, thereby improving the out-coupling efficiency of organic light-emitting diodes (OLEDs). The selected transparent conducting oxide materials for the composite electrode were composed of the same main material, gallium-doped zinc oxide (GZO), to avoid lattice mismatch and reduce interfacial strain. Herein, silicon-doped GZO (SGZO) with a relatively low refractive index was used in combination with molybdenum-doped GZO (MGZO) with a high work function to form a multifunctional transparent composite electrode. High transmittance of 94.5% and adequate sheet resistance of 52.3 Ohm/sq were realized through the design of SGZO/MGZO films on a glass substrate. The tested blue phosphorescent OLEDs with SGZO/MGZO composite anode outperformed devices with other selected single-layer electrodes, achieving a high peak efficiency of 29.0% (57.6 cd/A and 47.6 lm/W). These results demonstrate clear advantages of using this composite-electrode concept for realizing high efficiency OLEDs or other flexible optoelectronics.
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•SGZO with a relatively low refractive index was used in combination with MGZO with a high work function to form a multifunctional transparent composite electrode.•High transmittance and adequate sheet resistance were realized through the design of SGZO/MGZO films on a glass substrate.•An alternative SGZO/MGZO composite electrode presents a remarkable potential for realizing OLEDs with outstanding EL performance. |
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ISSN: | 1566-1199 1878-5530 |
DOI: | 10.1016/j.orgel.2020.105844 |