Synthesis of upconverting nanosheets derived from Er-Yb and Tm-Yb Co-doped layered perovskites and their layer-by-layer assembled films


Gunay B., Süer Ö., Döğer H., ARSLAN Ö., Unal U., Sağlam Ö.

Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol.649, 2022 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 649
  • Publication Date: 2022
  • Doi Number: 10.1016/j.colsurfa.2022.129502
  • Journal Name: Colloids and Surfaces A: Physicochemical and Engineering Aspects
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Compendex, EMBASE, INSPEC
  • Keywords: Layer-by-layer self-assembly, Two-dimensional materials, Single oxide nanosheets, Layered perovskites, Upconversion properties, UP-CONVERSION LUMINESCENCE, RUDDLESDEN-POPPER PHASES, RARE-EARTH, OXIDE, PHOTOLUMINESCENCE, IONS, PHOTOCATALYSTS, FLOCCULATION, EXFOLIATION, LANTHANIDE

Abstract

© 2022 Elsevier B.V.Here, we investigated the structure and upconversion (UC) properties of new-type of single oxide nanosheets, derived from the Er3+/Yb3+ and Tm3+/Yb3+ co-doped Ruddlesden-Popper type layered perovskites, and their layer-by-layer (LBL) self-assembled nanofilms. The single oxide nanosheets, obtained by exfoliation of the proton-exchanged K2La2Ti3O10, had the thickness in the range of 2–3 nm indicating good consistency with the theoretical thickness and lateral size from 500 nm up to 2 µm. Er3+/Yb3+, Tm3+/Yb3+ and Tm3+/Er3+co-doped nanosheets were used as building blocks of the multilayer films deposited by layer-by-layer procedure. The LBL films composed of 2.5 % Er3+ + 5 % Yb3+, 2.5 % Tm3+ + 20 % Yb3+, 2.5 % Tm3+ + 20 % Er3+ after 60 sequences have shown a white emission confirmed by the CIE chromaticity diagram. The possible UC energy transfer of LBL films fabricated after 30 sequences using the nanosheets derived from the 2.5 % Er3+ + 5 % Yb3+ co-doped layered perovskites was also suggested. The number of photons participating in the UC process was confirmed as two-photon for both green and red UC emissions due to the 4F9/2 →4I15/2 and 2H11/2, 4S3/2→ 4I15/2 transitions, respectively.