Polymer nanocomposite spectrum down-convertors for UV sensing

Abdalla M. Darwish, Sergey S. Sarkisov, Darayas N. Patel, Simeon Wilson, Rachel Jackson, Nichols Moody, Paolo Mele, Giovanna Latronico, Brent Koplitz

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationPhotonic Fiber and Crystal Devices
Subtitle of host publicationAdvances in Materials and Innovations in Device Applications XVI
EditorsShizhuo Yin, Ruyan Guo
ISBN (Electronic)9781510654426
Publication statusPublished - 2022
EventPhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVI 2022 - San Diego, United States
Duration: 2022 Aug 21 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferencePhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XVI 2022
Country/TerritoryUnited States
CitySan Diego
Period22/8/21 → …


  • avalanche photodetectors
  • perovskites
  • pulsed laser deposition
  • semiconductor quantum dots
  • solar-blind communication

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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