Size- and concentration-dependent Eu2+/Eu3+ mixed luminescent characteristics of rare-earth-doped CaF2 nanoparticles and their monolithic epoxy nanocomposites

George, Gibin; Hayes, Jacob I.; Collins, Candyce N.; Davis, Jason E.; Yu, Lei; Lin, Yulin; Wen, Jianguo; Ila, Daryush; Luo, Zhiping

doi:10.1016/j.jallcom.2020.157591

Size- and concentration-dependent Eu²⁺/Eu³⁺ mixed luminescent characteristics of rare-earth-doped CaF₂ nanoparticles and their monolithic epoxy nanocomposites

Journal Article · Wed Oct 14 00:00:00 EDT 2020 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2020.157591· OSTI ID:1798208

George, Gibin ^[1]; Hayes, Jacob I. ^[1]; Collins, Candyce N. ^[1]; Davis, Jason E. ^[2]; Yu, Lei ^[3]; Lin, Yulin ^[3]; Wen, Jianguo ^[3]; Ila, Daryush ^[1]; Luo, Zhiping ^[1]

Fayetteville State University, Fayetteville, NC (United States)
Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

CaF₂ is a promising luminescent host material for a wide range of applications, due to its high transparency, non-hygroscopy, low refractive index, low density, low backscattering efficiency, and abundance in nature. Here we report the photoluminescence (PL) and cathodoluminescence (CL) characteristics of rare-earth-doped CaF₂ nanoparticles and their composite monoliths with epoxy with visible emissions. The CaF₂ nanoparticles of ca. 36, 108 and 305 nm were prepared by a facile solution-mixing process and subsequent hydrothermal treatment. As the particle size decreases, the luminescence intensity increases for single-doped particles, while oppositely decreases for codoped particles because of energy transfer. Further, Eu²⁺- and Tb³⁺-codoped CaF₂ nanoparticles exhibit red emission, providing an efficient path for red emission through an energy transfer by Tb³⁺ bridging without direct Eu³⁺ doping. The effects of size and concentration are found to be pronounced in CL than PL, as the charge transfer between Eu²⁺ and Eu³⁺ reduces the concentration quenching in CL. The luminescence emission characteristics of epoxy/CaF₂ monoliths are different from those of particles due to the interactions with the epoxy molecules, and thus the energy transfer is hindered in PL while not in CL, enabling them for high-energy irradiation applications.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1798208

Alternate ID(s):: OSTI ID: 1778279

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Journal Issue: 15 Vol. 857; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Size- and concentration-dependent Eu2+/Eu3+ mixed luminescent characteristics of rare-earth-doped CaF2 nanoparticles and their monolithic epoxy nanocomposites

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Size- and concentration-dependent Eu²⁺/Eu³⁺ mixed luminescent characteristics of rare-earth-doped CaF₂ nanoparticles and their monolithic epoxy nanocomposites