MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202521086289 A) filed by Pandit Deendayal Energy University on September 11, 2025, for Broadband Solar Spectrum Harvesting Via Dual-Mode Upconversion And Downconversion In Yb³+/Er³+ Doped Bioci Nanosheets.
Inventors include Prakash Chandra; Paramsinh Zala; Krunal Baria; Mayank Gupta; and Brijesh Tripathi.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: The titled invention relates to a dual-mode luminescent material comprising Yb3+/Er3+ co-doped BiOCI nanosheets that exhibit both upconversion (UC) and downconversion (DC) photoluminescence. The material is synthesized via a hydrothermal-assisted method, forming flower-like nanostructures with high crystallinity. Under 980 nm excitation, the material emits visible green and red light through energy transfer from Yb3+ to Er3+ ions (UC), while 385 nm excitation induces visible emission via UV-to-visible downconversion. The phosphor is embedded into a polymer resin to fabricate a transparent luminescent solar concentrator (LSC) slab. The device demonstrates broadband spectral harvesting from UV to NIR and emission in the visible range, enhancing solar energy conversion efficiency. The invention offers a scalable approach for spectral conversion materials used in building-integrated photovoltaics (BIPV), smart solar windows, and photonic energy applications. Figure -1
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