Flexible Large Area SWIR Colloidal Quantum Dot Down Converters Based on Scalable Manufacturing Processes
The growing demand for efficient, compact, and cost-effective short-wave infrared (SWIR) emitters has surged due to their wide-ranging applications in industries such as biomedical diagnostics, food and pharmaceutical quality control, agriculture, and environmental monitoring. Conventional SWIR sour...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/427304 |
| Acceso en línea: | https://hdl.handle.net/2117/427304 https://dx.doi.org/10.1002/admt.202401960 |
| Access Level: | acceso abierto |
| Palabra clave: | Quantum dots Punts quàntics Àrees temàtiques de la UPC::Física |
| Sumario: | The growing demand for efficient, compact, and cost-effective short-wave infrared (SWIR) emitters has surged due to their wide-ranging applications in industries such as biomedical diagnostics, food and pharmaceutical quality control, agriculture, and environmental monitoring. Conventional SWIR sources are limited by bulkiness, inefficiency, and high cost, while phosphor-converted Light Emitting Diodes (pc-LEDs) based on transition metal ions or lanthanides face challenges such as fixed wavelengths, narrow absorption bands, and high-temperature manufacturing processes. Lead sulfide (PbS) colloidal quantum dots (CQDs) offer a promising alternative, combining wavelength tunability, synthesis simplicity, cost-effectiveness, and high photoluminescence quantum yield (PLQY). In this study, a scalable manufacturing process is introduced to fabricate flexible, high-performance SWIR down-converters (DCs) based on PbS CQDs embedded in an ethyl cellulose (EC) polymer matrix. Performance enhancements are achieved through a solution-phase ligand exchange (SPLE) with 1-dodecanethiol (DDthiol), improving passivation and device efficiency. When excited by a 980 nm LED, the DC achieves a SWIR output power density of 0.54 mW mm(-)(2) and a photon conversion efficiency of approximate to 15%. A practical application is demonstrated with a custom-built SWIR torch based on thin-film CQD DCs, shown to penetrate smoke, highlighting the potential of this technology for real-world use cases. |
|---|