Optical radiometry of light-emitting materials: Determining quantum yield and power efficiency of luminophores
Jan Valenta a, Anna Fucikova a, Dmytro Vorontsov a, Michael Greben a
a Charles University, Faculty of Mathematics and Physics, Department of Chemical Physics & Optics, Ke Karlovu 3, Prague 2, Czechia
Proceedings of Emerging Light Emitting Materials 2025 (EMLEM25)
La Canea, Greece, 2025 October 8th - 10th
Organizers: Maksym Kovalenko and Grigorios Itskos
Poster, Jan Valenta, 051
Publication date: 17th July 2025

Highly efficient photoluminescent (PL) (fluorescent) materials – often based on semiconductor quantum dots or organic dyes are finding may applications from lighting (phosphors) to solar-light harvesting (luminescent converters and concentrators). In this contribution, we present out innovative radiometry set-ups and methods [1,2], namely the portable set-up for determination of yield and efficiency of luminescent materials directly under the solar-illumination [3]. This portable set-up is currently applied for studies of the day-time radiative-cooling layers developed in our laboratory and in collaboration with the group of Prof. Santamouris (UNSW Sydney). We are developing methodologies for the most relevant and complete optical characterization of tested materials necessary for modelling and assessment of these materials. Other laboratory radiometry set-ups were developed for measurement of absolute quantum yield over broad spectral range and enable to solve some difficult tasks, like e.g. the measurements of anti-Stokes luminescence quantum yield. The latest task is to measure efficiency of radioluminescent scintilators.

We thank Prof. M. Santamouris and his group (University of New South Wales, Sydney) for fruitful collaboration. This project is supported by the Czech Science Foundation (project 23-06644S).

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