Investigation of luminescence properties and ratiometric thermometry through yellow-to-blue Dy3+ emission in Ca3La7(SiO4)5(PO4)O2 apatite

Autor segons l'article: Douzi, Abir; Slimi, Sami; Madirov, Eduard; Serres, Josep Maria; Sole, Rosa Maria; Ben Salem, Ezzedine; Turshatov, Andrey; Richards, Bryce S; Mateos, Xavier

Departament: Química Física i Inorgànica

Autor/s de la URV: Mateos Ferré, Xavier / Serres Serres, Josep Maria / Solé Cartañà, Rosa Maria

Paraules clau: Borate glasses; Eu3+; Lase; Phosphor

Resum: Dy3+-doped Ca3La7(SiO4)5(PO4)O2 (CLSPO) phosphors were synthesized via a solid-state reaction method and characterized for their structural, optical, and thermometric properties. X-ray diffraction (XRD) and Rietveld refinement confirmed a hexagonal apatite-type structure (P63/m) with refined lattice parameters of a = b = 9.604(3) & Aring;, c = 7.103(1) & Aring;. First-principles calculations for the undoped crystal revealed a direct bandgap of 4.08 eV, confirming CLSPO as a suitable host material for luminescent applications. Photoluminescence spectra exhibited characteristic Dy3+ emissions, with two blue bands (B1: 468 nm, B2: 479 nm) and two yellow bands (Y1: 543 nm, Y2: 575 nm). The yellow-to-blue (Y/B) intensity ratio displayed a strong temperature dependence, establishing CLSPO:Dy3+ as a promising candidate for luminescence-based thermometry. The optimal Dy3+ doping concentration was determined to be 3 at%, beyond which concentration quenching effects were observed. Photoluminescence studies further demonstrated that electric dipole-dipole interactions govern the dominant energy transfer mechanism, as evidenced by concentration-dependent quenching behavior. The absolute photoluminescence quantum yield (PLQY) was 5.7%, and Arrhenius analysis determined an activation energy of 0.11 eV. The decay time decreases with increasing Dy3+ concentration (from 658 mu s at 0.5 at% Dy3+ to 252 mu s at 10 at%). The fluorescence intensity ratio (FIR) method for optical thermometry revealed an absolute sensitivity (Sa) of 3.27 10-4 K-1 at 298 K, while the repeatability (R) of the Y/B ratio exhibited a reproducibility of 95.88% at 298 K, ensuring consistent and reliable temperature sensing performance. Furthermore, the luminescence remained stable over three hours of multiple heating-cooling cycles (298-523 K), confirming excellent photostability and reversibility. These results establish CLSPO:Dy3+ phosphors as highly efficient, thermally stable, and optically robust materials for next-generation temperature sensors, solid-state lighting, and advanced photonic applications.

Àrees temàtiques: Astronomia / física; Biodiversidade; Biotecnología; Chemical engineering (all); Chemical engineering (miscellaneous); Chemistry (all); Chemistry (miscellaneous); Chemistry, multidisciplinary; Ciência da computação; Ciência de alimentos; Ciências agrárias i; Ciências ambientais; Ciências biológicas i; Ciências biológicas ii; Ciências biológicas iii; Economia; Engenharias i; Engenharias ii; Engenharias iii; Engenharias iv; Ensino; Farmacia; General chemical engineering; General chemistry; Geociências; Interdisciplinar; Materiais; Medicina i; Medicina ii; Medicina iii; Medicina veterinaria; Odontología; Química; Saúde coletiva; Zootecnia / recursos pesqueiros

Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/

Adreça de correu electrònic de l'autor: xavier.mateos@urv.cat; rosam.sole@urv.cat; josepmaria.serres@urv.cat

Data d'alta del registre: 2025-08-02

Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion

Enllaç font original: https://pubs.rsc.org/en/content/articlelanding/2025/ra/d5ra01912e

Referència a l'article segons font original: Rsc Advances. 15 (25): 19623-19639

Referència de l'ítem segons les normes APA: Douzi, Abir; Slimi, Sami; Madirov, Eduard; Serres, Josep Maria; Sole, Rosa Maria; Ben Salem, Ezzedine; Turshatov, Andrey; Richards, Bryce S; Mateos, X (2025). Investigation of luminescence properties and ratiometric thermometry through yellow-to-blue Dy3+ emission in Ca3La7(SiO4)5(PO4)O2 apatite. Rsc Advances, 15(25), 19623-19639. DOI: 10.1039/d5ra01912e

URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/

DOI de l'article: 10.1039/d5ra01912e

Entitat: Universitat Rovira i Virgili

Any de publicació de la revista: 2025

Tipus de publicació: Journal Publications