Work

Optical tunability and higher order polynomial parameterization of the temperature dependent emission in Sm3+/Eu3+ co-activated tungstate phosphors for optoelectronic applications

Year: 2026

Type: article

Abstract: Phosphor based colour-tunable materials and optical temperature sensors have attracted considerable attention due to their non-contact temperature detection capabilities and optoelectronic applications. In this work, Ca 2 MgWO 6 :1.25 mol% Sm 3+ , xEu 3+ (x = 0-16 mol%) phosphors were synthesized via a solid-state reaction route. Under 409 nm excitation, efficient energy transfer from Sm 3+ to Eu 3+ ions enabled strong spectral tunability, with an optimal Eu 3+ concentration of 10 mol% beyond which concentration quenching occurred through dipole-quadrupole interactions. The optimized phosphor showed a direct optical band gap of 3.34 eV and retained 47% of its emission intensity at 498 K, indicating high thermal stability. The activation energy (0.21 eV) and quenching temperature (393 K) confirmed excellent thermal robustness. Temperature-dependent luminescence analysis using a 4 th order polynomial fit yielded maximum absolute and relative sensitivities of 0.0432 K -1 and 0.29% K -1 at 298 K, demonstrating strong potential for solid-state lighting and optical temperature sensing applications.

Source: Current Applied Physics

DOI: 10.1016/j.cap.2026.01.022

Authors: R. Kiran, S Masilla Moses Kennedy, A. Princy, Sudha D. Kamath

Institutions: Manipal Academy of Higher Education, Sri Sivasubramaniya Nadar College of Engineering

Language: English

Topic: Luminescence Properties of Advanced Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,640

Funder: Manipal Academy of Higher Education