Temperature-responsive dual-emission Ba2ZnSi2O7 phosphors co-doped with Tb3+ and Dy3+ for optical thermometry applications

Authors

Tejas, Manipal Institute of Applied Physics
A. Princy, SSN College of Engineering, Kalavakkam
S. Masilla Moses Kennedy, SSN College of Engineering, Kalavakkam
M. I. Sayyed, Isra University

Document Type

Article

Publication Title

Journal of Science Advanced Materials and Devices

Abstract

In this work, dual-emission phosphors based on Ba2ZnSi2O7 co-doped with Trivalent Terbium and Trivalent Dysprosium ions were successfully synthesized using a high-temperature solid-state method. X-ray diffraction analysis confirmed the monoclinic crystal structure with C2/c space group and phase purity of the materials, further validated by Rietveld refinement. Scanning electron microscopy revealed irregularly shaped nanoparticles in the nanometer range. Under UV excitation at room temperature, the phosphors exhibited characteristic green and yellow emissions attributed to Tb³⁺ and Dy³⁺, respectively. The optimal Dy³⁺ doping level was found to be 1.5 mol%, which also showed an increasing bandgap trend with higher Dy³⁺ concentrations. FTIR spectra confirmed no structural variation even after co-doping Dy³⁺ with Tb³⁺. TGA curves were analysed, and they were found to be stable after 200 °C with minimum loss of weight. Temperature-dependent photoluminescence studies indicated that Dy³⁺ emission underwent significant thermal quenching, with an activation energy of 0.152 eV and a quenching temperature of 382 K, making the material suitable for LED applications. The low phonon energy also revealed their suitability for producing optical thermometry sensors with materials. In contrast, the Tb³⁺ emission remained relatively stable with temperature variations. Temperature sensing capabilities were evaluated using fluorescence intensity ratio and lifetime-based methods, achieving maximum relative sensitivities of 4.96 % K⁻¹ at 298 K and 1.64 % K⁻¹ at 498 K, respectively. These findings highlight the potential of Tb³⁺/Dy³⁺ co-doped Ba2ZnSi2O7 phosphors as promising candidates for optical thermometry technologies.

DOI

10.1016/j.jsamd.2025.101054

Publication Date

12-1-2025

Recommended Citation

Tejas; Princy, A.; Masilla Moses Kennedy, S.; and Sayyed, M. I., "Temperature-responsive dual-emission Ba2ZnSi2O7 phosphors co-doped with Tb3+ and Dy3+ for optical thermometry applications" (2025). Open Access archive. 12112.
https://impressions.manipal.edu/open-access-archive/12112