VUV–UV–vis Luminescence, Energy Transfer Dynamics, and Potential Applications of Ce³⁺- and Eu²⁺-Doped CaMgSi₂O₆

Abstract

Ce 3+ and Eu 2+ single-and double-doped CaMgSi 2 O 6 phosphors have been prepared by a high-temperature solid-state reaction approach. The VUV−UV−vis luminescence properties are investigated at cryogenic temperatures. The dependencies of luminescence intensity and lifetime on temperature are discussed in detail, and the different thermal-quenching characteristics of luminescence of Ce 3+ and Eu 2+ in CaMgSi 2 O 6 are revealed combined with the VRBE scheme. Because of the different energy barriers of the lowest 5d energy and the conduction band bottom, luminescence thermal quenching of Ce 3+ does not occur below about 505 K, but that of Eu 2+ arises at a temperature above ∼300 K. The energy transfer dynamics is then analyzed by using the Inokuti-Hirayama, Yokota-Tanimoto, and Burshteın models, respectively. The Ce 3+ −Eu 2+ energy transfer is mainly through the electric dipole−dipole interaction with a critical distance of about 21.2 Å, and the energy migration between Ce 3+ ions in a fast or slow way is negligible. The different thermal-quenching behaviors of Ce 3+ and Eu 2+ luminescence and their energy transfer pave the way for the potential applications of the codoped samples in optical thermometry and anticounterfeiting.

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

“…Results indicate that the Tb 3+ –Sm 3+ energy transfer efficiency in this garnet host can easily achieve over 90%. As for the mechanism of energy transfer, it can be identified by the fitting of the equation below , in which I 0 is the emission intensity at time t = 0, that is, immediately after pulse, and γ is the radiative rate. C is related to the doping concentration of Sm 3+ and the Tb 3+ –Sm 3+ interaction strength.…”

“…Results indicate that the Tb 3+ −Sm 3+ energy transfer efficiency in this garnet host can easily achieve over 90%. As for the mechanism of energy transfer, it can be identified by the fitting of the equation below 22,23…”

Site Occupancies, Electron–Vibration Interaction and Energy Transfer of CaMgSi2O6: Eu2+, Mn2+ Phosphors for Potential Temperature‐Sensing and Anti‐counterfeiting Applications

“…The 4 f-5d excitation bands of Eu 2 + extend from about 200 to about 400 nm in CaMgSi 2 O 6 , while the emission spectrum is with a maximum at 451 nm and covers about 425-500 nm range. [28] If the Eu 2 + À Mn 2 + energy transfer exists in this host compound, it is possible to achieve spectral adjustment and discover new applications by co-doping of Eu 2 + and Mn 2 + ions. Figure 7a shows the emission spectra of the samples Ca 0.99À x Eu x Mn 0.01 MgSi 2 O 6 (x = 0.001, 0.003, 0.005, 0.008, 0.010) at RT.…”

Europium (II) Sulfate EuSO4: Synthesis Methods, Crystal and Electronic Structure, Luminescence Properties

“…[1][2][3][4][5][6][7] The reduction of Eu 3 + !Eu 2 + ions is used in the technology of separation of rare-earth raw materials. [7][8][9][10][11][12][13][14] Often, Eu 2 + compounds possess very interesting luminescent, [15][16][17] catalytic [18,19] and magnetic properties. [20][21][22] In terms of its properties, the Eu 2 + ion is similar to analogous ions of alkaline earth metals [13] and, in particular, strontium because of almost identical ionic radii (r(Eu 2 + ) = 0.112 nm, r(Sr 2 + ) = 0.127 nm).…”