期刊
ACS APPLIED MATERIALS & INTERFACES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c06670
关键词
quantum-dot; light-emitting diodes; top emission; outcoupling; angularly dependent emission
资金
- National Natural Science Foundation of China [62174075]
- Shenzhen Science and Technology Program [JCYJ20210324105400002]
- Guangdong University Research Program [2020ZDZX3062]
Top-emitting quantum-dot light-emitting diodes (TQLEDs) with improved electrode materials and scattering layer demonstrate high efficiency, color stability, and are ideal candidates for QLED displays.
Top-emitting quantum-dot light-emitting diodes (TQLEDs) with light emitted from the top semitransparent electrodes can improve the aperture ratio, efficiency, and color saturation of displays. However, because of the microcavity effect induced by the top semitransparent electrodes, the devices usually exhibit angular-dependent emission, which is unfavorable for display applications. In this study, highly transparent and conductive indium zinc oxide (IZO) is used as the top electrode to reduce the microcavity effect, thereby improving the angular color stability. By further applying a nanosphere scattering layer on the IZO top electrode, the trapped light is greatly extracted, and thus, the external quantum efficiencies (EQEs) are remarkably improved by 35, 50, and 133% for the red, green, and blue devices, respectively. The champion red TQLEDs exhibit a record EQE of 32.5% with angular-independent color emission. The demonstrated TQLEDs with high efficiency, high color stability, and a high aperture ratio could be the ideal candidates for QLED displays.
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