Site Occupancies, Electron–Vibration Interaction and Energy Transfer of CaMgSi2O6: Eu2+, Mn2+ Phosphors for Potential Temperature‐Sensing and Anti‐counterfeiting Applications. Issue 30 (13th April 2022)

• Record Type: Journal Article
• Authors: Su, Fang; Yang, Yunlin; Ou, Yiyi; Zhou, Weijie; Ma, Fengkai; Zhang, Jianhui; Brik, Mikhail G.; Liang, Hongbin
• Is Part Of: Chemistry. Volume 28:Issue 30(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-13
• Subjects: anti-counterfeiting -- CaMgSi2O6 -- Eu2+ -- Mn2+ -- temperature sensing; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202200381
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Eu 2+ ‐, Mn 2+ ‐ and Eu 2+ −Mn 2+ ‐doped CaMgSi2 O6 phosphors have been prepared by a high‐temperature solid‐state reaction. Systematic investigation of the concentration‐ and temperature‐dependent luminescence of Mn 2+ showed that Mn 2+ ions occupy two distinct sites in CaMgSi2 O6 . Electron–vibration interaction (EVI) analyses of Mn 2+ ions revealed Huang–Rhys factors of 4.73 and 2.82 as well as effective phonon energies of 313 and 383 cm −1 for the two sites. Eu 2+ −Mn 2+ energy transfer is also discussed, and its efficiency is estimated by lifetime and luminescence spectra. The different thermal quenching behaviours of Eu 2+ and Mn 2+, the distinct emission colours of Eu 2+ (blue, band peak at ∼451 nm) and Mn 2+ (yellow–red range, band peaks at ∼583 and 693 nm) endow the co‐doped samples with potential applications in luminescence thermometry and temperature‐/excitation wavelength‐responsive dual anti‐counterfeiting. Abstract : The two‐site occupancies, the electron–vibration interaction analyses of Mn 2+, and the Eu 2+ −Mn 2+ energy transfer are discussed. The different thermal quenching behaviours and emission colours of Eu 2+ and Mn 2+ ions in CaMgSi2 O6 endow the co‐doped samples with potential applications in temperature‐sensing and anti‐counterfeiting.