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@ARTICLE{Chukova:597223,
      author       = {Chukova, Oksana and Borkovska, Lyudmyla and Khomenkova,
                      Larysa and Ponomaryov, Semyon and Androulidaki, Maria and
                      Stratakis, Emmanuel},
      title        = {{E}ffects of thermal treatment on the complex structure of
                      luminescence emission of {L}i-doped {Z}n{O} screen-printed
                      films},
      journal      = {Frontiers in physics},
      volume       = {11},
      issn         = {2296-424X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {PUBDB-2023-06497},
      pages        = {1305114},
      year         = {2023},
      abstract     = {The ZnO–Li films were synthesized and investigated in an
                      attempt to explore and develop RE-free phosphor materials
                      capable of emitting intense visible light in a wide spectral
                      range. The effects of both heterovalent doping with lithium
                      and high-temperature annealing on the optical properties of
                      ZnO films were studied. The films were deposited on the
                      Al2O3 substrate using the screen-printing method and
                      annealed at 800–1,000°C in air for 0.5–3 h. Both doping
                      and annealing result in the transformation of the shape of
                      reflectance spectra in the range of 300–400 nm and the
                      shift of absorption edge to the long-wavelength region. At
                      the same time, the bandgap value estimated taking into
                      account the exciton peak position and its binding energy is
                      independent of Li-doping. The feature at 300–400 nm and
                      the shift of absorption edge are ascribed to the appearance
                      of the absorption band that excited the yellow
                      photoluminescence band. The photoluminescence spectra of
                      undoped and Li-doped films show the emission bands in the
                      ultraviolet and visible spectral ranges. The ultraviolet
                      emission is due to ZnO exciton recombination. The visible
                      emission band comprises several components peaked at 430,
                      482, 540, 575, and 640 nm. Their relative intensities depend
                      on Li-doping, annealing temperature, and annealing duration.
                      The 430- and 482-nm luminescence bands were observed in
                      Li-doped films only. Their excitation spectra show the peak
                      located at 330–340 nm, indicating that the energy
                      significantly exceeds the ZnO bandgap energy. Consequently,
                      the 430- and 482-nm luminescence bands are attributed to an
                      additional crystal phase formed under annealing. Other
                      components of visible emission bands are ascribed to the
                      defect-related emission of ZnO. The possible nature of these
                      bands is further discussed. Li-doping and annealing at
                      intermediate temperatures result in blue emission and an
                      enhancement of other visible bands, which makes ZnO–Li
                      films a perspective material in photonic applications.},
      cin          = {FS-PETRA-S},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PETRA-S-20210408},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      MSCA4Ukraine - MSCA4Ukraine (101101923) / NEP - Nanoscience
                      Foundries and Fine Analysis - Europe|PILOT (101007417)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(EU-Grant)101101923 / G:(EU-Grant)101007417},
      experiment   = {EXP:(DE-H253)P-P66-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001135606400001},
      doi          = {10.3389/fphy.2023.1305114},
      url          = {https://bib-pubdb1.desy.de/record/597223},
}