Tunable carbon-CsPbI3 quantum dots for white LEDs
In this work, we report a simple method to prepare white light emissive diodes based on QDs colloidal solutions using mixed carbon quantum dots (CQDs) and CsPbI3 perovskite (PQDs). The right combination generates emission across the entire visible spectrum upon ultraviolet excitation. The white ligh...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2072/529605 |
| Acceso en línea: | http://hdl.handle.net/2072/529605 https://doi.org/10.1002/adom.202001508 |
| Access Level: | acceso abierto |
| Palabra clave: | Quimica 54 |
| Sumario: | In this work, we report a simple method to prepare white light emissive diodes based on QDs colloidal solutions using mixed carbon quantum dots (CQDs) and CsPbI3 perovskite (PQDs). The right combination generates emission across the entire visible spectrum upon ultraviolet excitation. The white light emission of the final films provides high and stable color rendering index of 92%, tuning the chromaticity coordinates of the emission through the applied voltage. By varying the CsPbI3 QDs concentration, we obtain a mixture that emits the “warm”, “neutral” and “cold” white light sought for many indoor lighting applications, or to approximate the visible region of the solar spectrum, respectively. Remarkably, the material syntheses are low cost and truly scalable. In addition, colloidal mixtures of CQDs and CsPbI3 PQDs show a facile deposition for LEDs application, showing white-electroluminescence, indication that both kind of QDs are stable during LED operation. Last but not least, the PLQY of the colloidal mixtures is higher (up to 75%) than single white emitters, showing itself as a promising system for white emission with tunable properties. |
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