NaBi(MoO4)2 crystal: Defect states and luminescence properties for optoelectronic applications

Isik M., ALTUNTAŞ G., HASANLI N., Darvishov N.

Materials Letters, vol.383, 2025 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 383
  • Publication Date: 2025
  • Doi Number: 10.1016/j.matlet.2025.137990
  • Journal Name: Materials Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Defects, Luminescent properties, Molybdate, NaBi(WO4)2, Optical properties
  • Middle East Technical University Affiliated: Yes

Abstract

This paper investigates the electronic and optical properties of NaBi(MoO4)2 crystal through absorbance, thermally stimulated current (TSC), and photoluminescence (PL) measurements. Absorbance analysis revealed important information about the bandgap and the degree of disorder within the material. The bandgap energy of the compound was found to be 2.94 eV. TSC measurements revealed the presence of hole defect centers and provided information regarding charge transport mechanisms. Two TSC peaks were observed at temperatures of 69.3 and 127.5 K, and the activation energies of the trap centers associated with these peaks were found to be 0.05 and 0.14 eV. Two PL peaks were observed around 487 and 536 nm corresponding to the blue and green emissions, respectively. These findings provide a comprehensive understanding the band structure of the NaBi(MoO4)2, highlighting its suitability for use in optoelectronic devices, sensors, and light-emitting applications.