Optical properties of a new binary lead-free ferroelectric semiconductor Bi1/2Na1/2TiO3–Nd1/2Na1/2TiO3 solid solution system

• Published in: Applied physics. A, Materials science & processing Vol. 128; no. 9
• Main Authors: Dung, Dang Duc, Thoan, Nguyen Hoang, Lam, Nguyen Huu, Tho, Do Duc, Lam, Vu Tien, Trang, Nguyen Thi, Van, Duong Quoc
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2022; Springer Nature B.V
• Subjects: Applied physics; Cations; Characterization and Evaluation of Materials; Chemical synthesis; Condensed Matter Physics; Electron transitions; Ferroelectric materials; Ferroelectricity; Lead free; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Optical properties; Photoelectric emission; Photoluminescence; Physics; Physics and Astronomy; Processes; Raman spectra; Room temperature; Solid solutions; Surfaces and Interfaces; Thin Films; Na; Sol–gel method; Nd; Bi; Photoluminescence; TiO; Lead-free ferroelectric
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-05910-5

A new solid solution system of binary (1- x )Bi 1/2 Na 1/2 TiO 3  +  x Nd 1/2 Na 1/2 TiO 3 compound was well synthesized by a chemical method. The structural studies by X-ray diffraction and Raman scattering techniques provided strong evidence for the complex incorporation of Nd 3+ cations into the host Bi 1/2 Na 1/2 TiO 3 crystal during the formation of solid solutions. The random substitution of Nd 3+ cations at both A - and B -sites of the host Bi 1/2 Na 1/2 TiO 3 crystal resulted in reducing the optical bandgap from 3.05 to 2.94 eV. The strong photoemission intensity in the near-infrared region, around 883–915 nm, was obtained at room temperature, which was related to electron transitions from 4 F 3/2 to 4 I 9/2 levels of Nd 3+ cations. The observation in near-infrared photoemission of the new binary Nd 1/2 Na 1/2 TiO 3 -modified Bi 1/2 Na 1/2 TiO 3 materials exhibited a new method successfully applied for the integration of photoluminescence in lead-free ferroelectric materials for further smart electronic device applications.