High-performance all-solution-processed quantum dot near-infrared-to-visible upconversion devices for harvesting photogenerated electrons
| Autor: | Bing Xu, Wei-Qiao Deng, Weigao Wang, Nan Zhang, Kanming Shi, Xiao Wei Sun, Haodong Tang, Kai Wang |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) business.industry Near-infrared spectroscopy Energy conversion efficiency 02 engineering and technology Electron 021001 nanoscience & nanotechnology 01 natural sciences Cathode Photon upconversion law.invention law Quantum dot 0103 physical sciences Optoelectronics 0210 nano-technology business Diode Visible spectrum |
| Zdroj: | Applied Physics Letters. 115:221103 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | All-solution-processed quantum dot (QD) upconversion devices were realized by constructing a colloidal PbS QD near-infrared (NIR ∼ 1 μm)-sensitive layer on the cathode side of a red CdSe quantum dot light-emitting diode (QLED). Different from conventional upconversion devices, we utilized the photogenerated electrons rather than the holes created in the NIR-sensitive layer to inject into the QLED for visible light emission. Consequently, we obtained high-performance devices with a maximum photon-to-photon conversion efficiency of 3.35% and a luminance on-off ratio of approximately 8 × 103. The results indicate that the device structure could be used to realize low-cost and portable high-performance QD-based upconversion devices via solution-processing. |
| Databáze: | OpenAIRE |
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