Investigation of structural, morphological and spectral characteristics of double perovskite Sr2GdTaO6 phosphors doped with Eu3+, and co-doped Eu3+, B3+ having improved quantum efficiency

İlhan M., Güleryüz L. F.

Journal of Materials Science: Materials in Electronics, cilt.35, sa.34, 2024 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Sayı: 34
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s10854-024-13832-6
  • Dergi Adı: Journal of Materials Science: Materials in Electronics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, MEDLINE, Metadex, Civil Engineering Abstracts
  • Marmara Üniversitesi Adresli: Evet

Özet

The increasing boron effect significantly enhanced the luminescence and asymmetry of double perovskite phosphor. The structural, morphological and spectral characteristics of Sr2Gd1−xTaO6:xEu3+, (x = 0.5–20 mol%) and Sr2Gd1−xTaO6:xEu3+, yB3+ (x = 10 mol%, y = 0–100 mol%) phosphor series were examined in terms of Eu3+ increase and B3+ increase. In XRD results, Eu3+ doped Sr2GdTaO6 samples exhibited a single-phase up to 20 mol%, and slight impurity phase was formed at high concentration in Eu3+, B3+ co-doped Sr2GdTaO6 series. In SEM micrographs, there was no significant change in grain morphology of Eu3+ doped grains, whereas the flux effect of boron led to grain growth in Eu3+, B3+ co-doped samples. The optical band gap energy (Eg) varied in the range of 4.42–4.27 and 4.27–4.08 eV for Eu3+ doped and Eu3+, B3+ co-doped series, respectively. The maximum increases in emissions depending on Eu3+ and B3+ increase were 10 mol% for Sr2GdTaO6:Eu3+ and 50 mol% for Sr2GdTaO6:Eu3+, B3+, respectively. The increased B3+ concentration improved the electric dipole transition (5D0 → 7F2), and the asymmetry ratio increased from 0.35 to 2.65. Judd–Ofelt (JO) parameters were calculated from the emission spectrum, in which the Ω2 and Ω4 parameters for Sr2GdTaO6:Eu3+ phosphors are close values, and both parameters increased in Sr2GdTaO6:Eu3+, B3+. The quantum efficiency of Sr2GdTaO6:Eu3+ phosphors ranged between 49.82 and 93.08%, and the ɳQE values for Sr2GdTaO6:Eu3+, B3+ exceeded 100%.