Spectrum converting nanocomposites for sensitive detectors of short-wavelength radiation

Darayas N. Patel; Sergey S. Sarkisov; Abdalla M. Darwish; Kelly Whyte; Sabrina Collins; Crystal Smith

doi:10.1117/12.2646208

14 March 2023 Spectrum converting nanocomposites for sensitive detectors of short-wavelength radiation

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Kelly Whyte, Sabrina Collins, Crystal Smith

Proceedings Volume 12417, Optical Components and Materials XX; 124170J (2023) https://doi.org/10.1117/12.2646208
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Existing UV sensors often use vacuum photo-multiplying tubes (PMTs). Solid state photodetectors are either blind to UV (use silicon) or have low sensitivity (use wide bandgap semiconductors). We report on our efforts to develop polymer nanocomposites made of the nanoparticles (NPs) of perovskites CsPbX₃ (X stands for Cl, Br, and I) and lanthanide doped compounds that captured UV photons and efficiently converted their energy into visible and near-infrared (NIR) photons. The wavelength of these low-energy photons matches the spectral response of silicon avalanche photo diodes (APDs) with an electronic gain of < 10⁶. For instance, NPs of perovskite CsPbBr₃ with a diameter of 16 nm produced strong visible radiation at 512 nm being excited with a 372-nm UV laser while the NPs of La₂O₃: Eu³⁺ demonstrated strong photoluminescence in red region (between 600 and 650 nm) with a quantum yield of 60%. The nanocomposites were integrated with silicon APDs. The proposed combination worked as a UV detection system with two orders of magnitude improved sensitivity. Such a photodetector is particularly useful for the non-line-of-sight (NLOS) free space optical communication (FSO) in the solar-blind spectral region 100-280 nm where the background noise from solar UV radiation is eliminated due to absorption by ozone layer in the upper atmosphere.

Conference Presentation

Citation Download Citation

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Kelly Whyte, Sabrina Collins, and Crystal Smith "Spectrum converting nanocomposites for sensitive detectors of short-wavelength radiation", Proc. SPIE 12417, Optical Components and Materials XX, 124170J (14 March 2023); https://doi.org/10.1117/12.2646208

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