WEB Solution processed photonic structures for nanophosphor emission controlTuesday (22.09.2020) 12:05 - 12:20 P: Processing and Synthesis 1 Part of:
Rare-earth phosphors are the materials in which solid-state lighting technology is based. Nevertheless, their large crystal size hinders the control over the emitted light. The synthesis of nanoparticles made of such materials and the processing of them into transparent thin films open new routes to manipulate the way the light is generated. Herein, we demonstrate that the integration of nanophosphor-based transparent films into photonic structures lead to a precise control over the chromaticity and directionality of these nanosources avoiding chemical modification in the synthesis route and thus maintaining the stability of the nanoparticles.
In particular, GdVO4:Eu3+ nanophosphor films are integrated in periodic multi-layered structures, i.e. 1D photonic crystals, made of transparent ZrO2 and SiO2. The photonic structures are designed in order to sustain resonant modes at the wavelength of the most intense emission peak of the europium cation. Then, they are fabricated through spin and dip coating. [1, 2]
The combination of nanophosphors with photonic structures provides new ways of modifying the color or directionality of the emission of these nanosources with high thermal and chemical stability without modifying the synthesis route of them.
 Geng, D., Cabello-Olmo, E., Lozano, G., & Míguez, H. (2018). Photonic structuring improves the colour purity of rare-earth nanophosphors. Materials horizons, 5(4), 661-667.
 Geng, D., Cabello-Olmo, E., Lozano, G., & Míguez, H. (2019). Tamm Plasmons Directionally Enhance Rare-Earth Nanophosphor Emission. ACS photonics, 6(3), 634-641.