Structure-dependent luminescence of Eu3+-doped strontium vanadates synthesized with different V : Sr ratios – application in WLEDs and ultra-sensitive optical thermometry. Issue 14 (23rd March 2023)

• Record Type: Journal Article
• Authors: Woźny, Przemysław; Soler-Carracedo, Kevin; Stopikowska, Natalia; Martín, Inocencio R.; Runowski, Marcin
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 14(2023)
• Page Start: 4792
• Page End: 4807
• Publication Date: 2023-03-23
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc05341a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Sr3 V2 O8 :Eu 3+ exhibits bi-modal, structure-dependent luminescence, and can be applied as an ultra-sensitive temperature sensor based on its spectral shift. Abstract : This work mainly focused on luminescence color tuning, white light generation and ultra-sensitive temperature sensing based on complex strontium vanadates doped with Eu 3+ ions. A series of materials whose crystal structure changes from orthorhombic SrCO3, through hexagonal Sr5 V3 O13 and trigonal Sr3 V2 O8 to triclinic Sr2 V2 O7 were obtained via a modified sol–gel method, using altered vanadate to strontium ion ratios (V : Sr). Changes in the charge transfer band (CTB), characteristics of the Eu 3+ ion emission and luminescence intensity changes were observed with an increasing content of vanadate groups in the materials. Dual-mode, excitation-dependent luminescence, white ( λ ex = 345 nm) and red ( λ ex = 393 nm), is observed. The luminescence color, chromaticity coordinates, color purity, quantum efficiency and emission correlated color temperature (CCT) of materials were compared. The application of the optimized Sr3 V2 O8 :2%Eu 3+ material as a multimodal temperature sensor is discussed. Temperature-dependent luminescence properties are investigated and an optical thermometer with high sensitivity is developed, revealing that the material has an extremely high spectral shift with a temperature of up to ∼0.862 nm K −1, currently classifying it as the most sensitive shift-based optical thermometer. Additionally, thanks to the capability of the developed phosphors for efficient energy conversion, we demonstrated their applicability in white-light generation for LED devices.