Photoluminescence, electro-optic response and piezoelectric properties in pressureless-sintered Er-doped KNN-based transparent ceramics

Xiao Wu, Shengbo Lu, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


Er-doped (K0.5Na0.5)1−xLixNb1−xBixO3(0.05 ≤ x ≤ 0.08) ceramics have been prepared by pressureless sintering. Because of the cubic-like phase as well as the dense and fine-grained structure, the ceramics are optically clear, exhibiting high transmittances in the near-infrared and mid-infrared (MIR) regions (∼50% and ∼75%, respectively). They also possess strong electro-optic (EO) response, giving a large effective linear EO coefficient (128–184 pm/V). Owing to Er3+, the ceramics exhibit green and red up-conversion photoluminescence (PL) emissions, which are sensitive to the crystal symmetry of the ceramic host. The ceramics also exhibit a low absorption coefficient of OH−groups and then distinct and broadband MIR emissions. Together with the relatively large piezoelectric coefficient (70–90 pC/N), high dielectric constant (∼1400) and low dielectric loss (∼0.03), the ceramics open up potential applications in electrical/optical interdisciplinary field, such as visible displays, MIR solid lasers and optical attenuators.
Original languageEnglish
Pages (from-to)3573-3578
Number of pages6
JournalJournal of Alloys and Compounds
Publication statusPublished - 1 Jan 2017


  • Electro-optic effect
  • Ferroelectrics
  • Mid-infrared emission
  • Photoluminescence
  • Transparent ceramics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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