Resonance/off-resonance excitations: implications on the thermal evolution of Eu³⁺ photoluminescence

Abstract

Generally, it is known that the intensity of the emission of trivalent lanthanide ions (Ln3+) increases on cooling because of the reduced decay of the excited state population via the...

A brief review of characteristic luminescence properties of Eu3+ in mixed-anion compounds

“…In the case of Eu 3+ -doped phosphors, some studies have examined the LIR between Eu 3+ :4f–4f and different emission bands, such as other Ln 3+ ions or host compounds. 214–220 Since the luminescence intensity of the Eu 3+ : 5 D 0 → 7 F J transitions in oxides or fluorides is relatively stable (see Fig. 3c), a high S r value may be obtained by combining them with a different luminescent center that can quench even at low temperatures.…”

Sensitive Luminescence Thermometry through Excitation Intensity Ratio in Eu-Doped BaTiO3

“…BaTiO 3 (BTO) possesses a temperature-sensitive optical bandgap, which is valuable for designing novel EIR-based thermometers. , To date, this nature of BTO has not yet been utilized despite the extensive studies of lanthanide-doped BTO for luminescence thermometry, such as BTO:Er 3+ , BTO:Eu 3+ , BTO:Yb 3+ /Ho 3+ , BTO:Er 3+ /Eu 3+ . − In these previous studies, conventional LIR strategies typically resulted in low S r (<2% K –1 ) at room temperature. Although some other novel strategies obtained enhanced S r (∼3% K –1 ) beyond room temperature by virtue of second harmonic generation or Raman signals, these methods required additional instruments for signal acquisition.…”

Tuning the Emission of Homometallic DyIII, TbIII, and EuIII 1-D Coordination Polymers with 2,6-Di(1H-1,2,4-triazole-1-yl-methyl)-4-R-phenoxo Ligands: Sensitization through the Singlet State

“…Weissman in 1942 discovered that the excited energy levels of the lanthanide ions can be populated by energy transfer from excited states of the ligands; a process known as IET . The IET process can be modeled using various mechanisms, including exchange, dipole–dipole, and dipole–multipolar interactions. , Additionally, the sensitization of the lanthanide ion can involve various donor levels, such as singlet (S*), triplet (T*), intraligand charge transfer (ILCT), ligand-to-metal charge transfer (LMCT), or direct 4f excitations. ,− Among the mentioned energy transfer processes, the one that involves the triplet level requires an intersystem crossing (ISC) (S* → T*) and is considered significant in the sensitization of lanthanide luminescence. Pioneering studies conducted by Sato and Wada and Latva et al established reference gap values between the triplet and acceptor lanthanide levels for optimal energy transfer.…”