@inproceedings{446898cbb30f4ce1b3e99017f2aadf36,
title = "Polymer nanocomposite spectrum down-convertors for UV sensing",
abstract = "We report on polymer nanocomposite films with spectrum down-converting properties that can be transferred using pulsed laser deposition (PLD) on silicon avalanche photodiodes (APD) for responsive and fast UV sensing. The proposed spectrum down-convertors use two types of nanoparticles (NPs) embedded in a colorless polyimide matrix: semiconductor CdSe/ZnS core-shell quantum dots (QDs) and the QDs made of rare-earth (RE) doped lead halide perovskites CsPbX3 (X stands for Br and Cl). These NPs have efficient down-conversion of UV radiation into visible and near-infrared (NIR) light matching spectral responsivity of Si APD with the photoluminescence quantum yield (PLQY) from 50 to 190%. Once an APD detects visible/NIR signal, it responds with an electronic gain >106 and a response time of ∼10 ns thus making rapid and strong UV sensing possible. Both types of NPs have strong absorption of UV and additionally protect the APD from degradation caused by UV radiation. CdSe/ZnS core-shell QDs convert UV spectrum in visible with a red peak at 631 nm using the down-shifting mechanism. The perovskite QDs doped with the ion of Yb3+ emitted in NIR with a peak at 980 nm due to the mechanism of down-conversion or quantum cutting. Both types of NPs were embedded in a polymer matrix and PLD deposited on a transparent substrate. We describe the results of characterization of the down-convertors using dynamic light scattering, X-ray diffraction, optical photoluminescence spectroscopy, and the photo-voltaic characteristics of silicon photodetectors integrated with the down-convertors.",
keywords = "avalanche photodetectors, perovskites, pulsed laser deposition, semiconductor quantum dots, solar-blind communication",
author = "Darwish, {Abdalla M.} and Sarkisov, {Sergey S.} and Patel, {Darayas N.} and Simeon Wilson and Rachel Jackson and Nichols Moody and Paolo Mele and Giovanna Latronico and Brent Koplitz",
note = "Funding Information: Dillard team appreciates the financial support from US Air Force Office of Scientific Research Grant FA9550-18-1-0364 AFOSR, Army Research Office Grants No W911-NF-19-1-0451, W911-NF-2210128 and the partial support from Dillard University Minority Health and Health Disparity Research Center MHHDRC. Dr. Patel{\textquoteright}s research was sponsored by the Army Research Office and was accomplished under Grant Number W911-NF-18-1-0446 and instrumentation Grant Number W911-NF-19-10506. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office, The Air Force Office of Scientific Research or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Dr. Patel{\textquoteright}s research was also supported by NSF Grant 2200426. Publisher Copyright: {\textcopyright} 2022 SPIE. All rights reserved.; Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVI 2022 ; Conference date: 21-08-2022",
year = "2022",
doi = "10.1117/12.2630722",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Shizhuo Yin and Ruyan Guo",
booktitle = "Photonic Fiber and Crystal Devices",
}