Saure, LM and Lumma, J and Kohlmann, N and Hartig, T and Teotonio, EES and Shetty, S and Ravishankar, N and Kienle, L and Faupel, F and Schröder, S and Adelung, R and Terraschke, H and Schütt, F (2024) Functional light diffusers based on hybrid CsPbBr3/SiO2 aero-framework structures for laser light illumination and conversion. In: Journal of Materials Science, 59 (37). 17382- 17393.
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Abstract
The new generation of laser-based solid-state lighting (SSL) white light sources requires new material systems capable of withstanding, diffusing, and converting high intensity laser light. State-of-the-art systems use a blue light emitting diode or laser diode in combination with color conversion materials, such as yellow emitting Ce-doped phosphors or red and green emitting quantum dots (QD), to produce white light. However, for laser-based high-brightness illumination thermal management and uniform light diffusion are still major challenges in the quest to convert a highly focused laser beam into an efficient lighting solution. Here, we present a material system consisting of a highly open porous (> 99) framework structure of hollow SiO2 microtubes. This framework structure enables efficient and uniform light distribution as well as ensuring good thermal management even at high laser powers of up to 5 W, while drastically reducing the speckle contrast. By further functionalizing the microtubes with halide perovskite QDs (SiO2@CsPbBr3 as model system) color conversion from UV to visible light is achieved. By depositing an ultrathin (~ 5.5 nm) film of poly(ethylene glycol dimethyl acrylate) (pEGDMA) via initiated chemical vapor deposition (iCVD), the luminescent stability of the QDs against moisture is enhanced. The demonstrated hybrid material system paves the way for the design of advanced and functional laser light diffusers and converters that can meet the challenges associated with laser-based SSL applications. Graphical Abstract: (Figure presented.) © The Author(s) 2024.
| Item Type: | Journal Article |
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| Publication: | Journal of Materials Science |
| Publisher: | Springer |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Aluminum compounds; Bromine compounds; Chemical vapor infiltration; Diffusers (fluid); Diffusers (optical); Doping (additives); Indium compounds; Laser beams; Laser chemistry; Laser materials processing; Liquid crystals; Luminescence of solids; Nanocrystalline alloys; Nanocrystals; Semiconductor quantum dots; Silica; Silicates, Color conversions; Framework structures; Functionals; Laser lights; Laser-based; Light diffuser; Material systems; Microtube; SiO 2; Thermal, Perovskite |
| Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
| Date Deposited: | 16 Oct 2024 11:33 |
| Last Modified: | 16 Oct 2024 11:33 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86516 |
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