Enhanced luminescence of a silica-nitride phosphor; La<sub>3</sub>Si<sub>6</sub>N<sub>11</sub>:Ce<SUP>3+</SUP>by using Cr<SUP>3+</SUP>-activated TiO<sub>2</sub> nanoparticles

Aydin I., Ertekin K., Azem F. A., Delice T. K., Birlik I.

INTERNATIONAL JOURNAL OF CERAMIC ENGINEERING AND SCIENCE, cilt.6, sa.1, 2024 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 6 Sayı: 1
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1002/ces2.10198
  • Dergi Adı: INTERNATIONAL JOURNAL OF CERAMIC ENGINEERING AND SCIENCE
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Applied Science & Technology Source, INSPEC, Directory of Open Access Journals
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Ce3+-activated silica nitride phosphors (lanthanum silicate-nitride [LSN]) are promising thermostable conversion components for white-light-emitting diodes, screen technologies, and other optoelectronic applications. Cr3+-activated TiO2, on the other hand, is a strongly absorbing material depending on its size and optical microenvironment. In this work, we gathered Cr3+-doped TiO2 and La3Si6N11:Ce3+ in an optically transparent polymethylmethacrylate matrix. Photoluminescence of the binary blends of La3Si6N11:Ce3+/TiO2 and La3Si6N11:Ce3+/TiO2:Cr3+ has been investigated under two different excitation energies by steady-state and lifetime-based measurements, respectively. When the microscale La3Si6N11:Ce3+ phosphor and nanoscale TiO2:Cr3+ particles were gathered at a critical concentration, the resulting composite exhibited 3.14-fold enhancement in the emission signal intensity with respect to the additive-free phosphor. Upon excitation, the La3Si6N11:Ce3+-TiO2:Cr3+ blend exhibited different excited-state lifetimes for the nano- and microsecond time-scales compared to the LSN. The microsecond time-scale measurements performed under 378 nm excitation supported the existence of a potential energy transfer from the TiO2:Cr3+ to the La3Si6N11:Ce3+.