Highly Sensitive Optical Manometer Based on the Visible Emissions of Ce³⁺‐Doped La₆Sr₄(SiO₄)₆F₂ Multisite Phosphors

Abstract

For overcoming the unsatisfactory sensitivity of optical manometers and the susceptibility of manometric parameters to temperature changes, a series of Ce3+‐doped La6Sr4(SiO4)6F2 phosphors with multicolor emissions are developed. Excited by 375 nm, the resultant compounds exhibit asymmetric and broad emission bands, which can be easily deconvoluted into two peaks originating from seven to ninefold coordinated Ce3+ sites, where their intensities are dependent on the excitation wavelength. Through analyzing the pressure‐related luminescence intensity ratio (LIR) derived from these two Ce3+ sites, it is clear that the final manometer exhibits an unprecedentedly high relative sensitivity of ≈ 425% GPa−1 at 0.76 GPa (the highest value reported to date). As pressure increases, the emitting color tunes from yellow to blue, resulting in the possibility of visual pressure sensing. Furthermore, based on the color coordinates of the phosphor material, its pressure sensing capability is discussed, in which the maximum sensitivities are 24.38 and 27.74% GPa−1 at 0.76 GPa, when x‐coordinate and y‐coordinate are employed, respectively. Additionally, the LIR value is only slightly affected by temperature, leading to a thermal invariability manometric factor (TIMF) > 400 K GPa−1. The findings indicate that Ce3+‐doped La6Sr4(SiO4)6F2 phosphors are good luminescent candidates for optical and visual multi‐mode manometers.

Thermally Stable Red-Emitting Ca18K3Sc(PO4)14:Mn2+ Phosphor and Enhanced Luminescence by Energy Transfer Between Ce3+-Eu2+-Mn2+

“…In order to balance charges, Ca 2+ vacancies will be generated in the matrix, namely, 3Ca Ca → 2Ce 3+ 2Ce Ca ′ + V Ca •• . The ion radius between dopants and cations can be used to evaluate the feasibility of Ce 3+ occupying the Sc 3+ site, and the difference was calculated by eq D R = false( R H − R D false) R H × 100 % …”

Highly‐Sensitive, Tri‐Modal Luminescent Manometer Utilizing Band‐Shift, Ratiometric and Lifetime‐Based Sensing Parameters

“…The most promising results were obtained for the following spectral ranges: . [11,17,39,40] The evolution of the LIR as a function of pressure is illustrated in Figure 4b, where orange dots represent the results obtained during compression, while crosses denote data from the decompression cycle. As pressure rises to ≈2.6 GPa, a monotonic seven-fold increase in LIR is evident.…”

“…Figure 5. Temperature-dependent emission spectra (𝜆 exc = 445 nm) a), thermal evolution of LIR b), and corresponding S R c) in T-range from 203 to 403 K for the Li 3 Sc 2 (PO 4 ) 3 :1%Cr 3+ ; comparison of TIMF and S R,p for selected ratiometric luminescent manometers d) [11,17,39,40]. …”

Enhanced Down-Conversion Emission, High-Level Security, and Advanced Latent Fingerprint Visualization in La2Zr2O7:Er3+ Nanophosphor through Surface Modification and Deep Learning Analysis

“…The confinement can result in quantized energy levels within the band gap. 4 Surface modifiers can affect the extent of quantum confinement by modifying the surface potential and the electronic structure near the surface, influencing the energy levels and reducing the energy gap.…”

“…The spectra exhibit peaks at 366, 378, 407, 451, and 489 nm, corresponding to the4 I 15/2 → 4 G 9/2 , 4 I 15/2 → 4 G 11/2 , 4 I 15/2 →…”