A1 Refereed original research article in a scientific journal

Channelling Er3+-activated vanadate garnet's multimode luminescence for high-sensitivity optical thermometers and NIR-II pc-LEDs for bioimaging†




AuthorsBindhu, Amrithakrishnan; Naseemabeevi, Jawahar I.; Ganesanpotti, Subodh

PublisherRoyal Society of Chemistry (RSC)

Publishing placeCAMBRIDGE

Publication year2025

Journal:Journal of Materials Chemistry. C

Journal name in sourceJournal of Materials Chemistry C

Journal acronymJ MATER CHEM C

Volume13

First page 14886

Last page14901

Number of pages16

ISSN2050-7526

eISSN2050-7534

DOIhttps://doi.org/10.1039/d5tc01032b

Web address https://doi.org/10.1039/d5tc01032b


Abstract
Channeling the dual-mode luminescence of an Er3+-activated Sr2NaMg2V3O12 garnet is required for meeting the demands of multifunctional phosphors for optical thermometry and bioimaging. Herein, the temperature-sensing properties and prospects of bioimaging of the vanadate garnet, exhibiting dual-mode photoluminescence, are investigated in detail. The negative thermal quenching of the G1 band via phonon-assisted population inversion resulted in a distinct thermal response. Based on the fluorescence intensity ratio, FIR, and Raman-PL intensity ratio, the RPIR method, a maximum relative temperature sensitivity of 8.9% K-1 at 80 K, is observed, offering wide range thermometry. Tunability of emission from the visible to NIR-II region with maxima at 1536 nm is achieved. Notably, benefitting from the enhanced structural rigidity of the garnet followed by the higher Debye temperature, the phosphor exhibits excellent thermal stability with T-1/2 > 500 K. The fabricated NIR-II pc-LEDs exhibit stable NIR-II emission even at higher input bias currents. Furthermore, the prospects of fabricated NIR-II pc-LEDs for bioimaging are evaluated, confirming the potentiality of the present phosphor for risk-free imaging of biological systems. This work puts forth a new dimension to the vanadate garnets for realizing optical thermometers with the highest sensitivity and risk-free imaging of biological systems.


Funding information in the publication
Amrithakrishnan Bindhu acknowledges the Department of Science and Technology (DST), Govt. of India, for the award of INSPIRE Senior Research Fellowship. The authors acknowledge the Central Laboratory for Instrumentation and Facilitation (CLIF) of the University Kerala for the instrumentation support and the financial support received from ANRF, India through CRG/2023/007180.


Last updated on 2025-15-10 at 13:45