DataVXAdvanced Optical MaterialsPaper
journal article·2019-06

Enhanced Photoluminescence in Quantum Dots–Porous Polymer Hybrid Films Fabricated by Microcellular Foaming

Shudong Yu, Benjamin Fritz, Siegbert Johnsen, Dmitry Busko, Bryce S. Richards, Marc Hippler, Gabriele Wiegand, Yong Tang, Zongtao Li, Uli Lemmer, Hendrik Hölscher, Guillaume Gomard

Advanced Optical Materials· Volume 7· Issue 12
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Source abstract

Abstract

Abstract The color conversion efficiency of thin polymeric layers embedding quantum dots (QDs) is limited by their negligible light scattering ability and by the insufficient absorption of the excitation photons. In this study, a route is presented to tackle these optical shortcomings by introducing a tailored network of micropores inside these hybrid films. This is achieved by exploiting the microcellular foaming approach which is rapid, cost effective and only makes use of a green solvent (supercritical carbon dioxide). With an appropriate combination of the applied pressure and temperature during foaming, and by using a proper film thickness, the photoluminescence (PL) intensity is enhanced by a factor of up to 6.6 compared to an equivalent but unfoamed hybrid film made of CdSe/ZnS QDs in a polymethyl methacrylate matrix. Spectroscopic measurements and ray tracing simulations reveal how the porous network assists UV/blue light absorption by the QDs and the subsequent outcoupling of the converted light. The approach improves the PL for various QD concentrations and can be easily scaled up and extended to other polymeric matrices as well as light converting materials.
Source: crossref · Quality: baseline

Research context

Polymers

OpenAlex topics: Luminescence and Fluorescent Materials · Quantum Dots Synthesis And Properties · Pickering emulsions and particle stabilization

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes South China University of Technology (SCUT) Guangzhou 510640 China

Light Technology Institute Karlsruhe Institute of Technology (KIT) Engesserstrasse 13 Karlsruhe 76131 Germany

Institute of Catalysis Research and Technology Karlsruhe Institute of Technology (KIT) Eggenstein‐Leopoldshafen Karlsruhe 76344 Germany

Institute of Microstructure Technology Karlsruhe Institute of Technology (KIT) Eggenstein‐Leopoldshafen Karlsruhe 76344 Germany

Zoological Institute Cell and Neurobiology Karlsruhe Institute of Technology (KIT) Fritz‐Haber‐Weg 4 76131 Karlsruhe Germany

Institute of Applied Physics Karlsruhe Institute of Technology (KIT) Wolfgang‐Gaede‐Strasse 1 76131 Karlsruhe Germany

Funding

Deutsche Forschungsgemeinschaft · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province

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