Abstract
In this book chapter, the divalent europium-activated alkaline-earth-metal pyrophosphate M2P2O7 (M = Ca, Sr, Ba) phosphors were effectively prepared via a conventional high temperature sintering reaction technique in a reducing atmosphere at 900 ℃. The synthesized materials have been systematically investigated using powder X-ray diffraction. The XRD pattern exhibit that Ca2P2O7 has a β-phase, Sr2P2O7 has an α-phase, Ba2P2O7 has a β-phase and the crystal structure of the M2P2O7 (M = Ca, Sr, Ba) hosts was unaffected with the introduction of Eu2+ ions. The nuclear magnetic resonance (NMR), infrared (IR) and Raman spectroscopy of β-Ca2P2O7, α-Sr2P2O7 and γ-Ba2P2O7 were reported and discussed in accordance with the structural peculiarities of Alkaline earth phosphates. The luminescence properties of Eu2+ in these phosphate materials were explored in detail in both vacuum ultraviolet (VUV) and ultraviolet (UV) regions. The emission spectra of β-Ca2P2O7: 1%Eu2+, α-Sr2P2O7: 1%Eu2+ and γ-Ba2P2O7:1%Eu2+ exhibit a large asymmetric band blue-emitting under the excitation of 320 nm, caused by the 4f65d1 → 4f7[8S7/2] transition of Eu2+ at room temperature. The excitation spectra display a broad and intense absorption in the 250–400 nm wavelengths region, which is matched with the blue emission band using for emitting n-UV (NUV) LED chips (360–400 nm). The above results indicate that diphosphate phosphors could be promising for generating blue-materials for white LED applications.
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Derbel, M., Mbarek, A. (2022). Blue-Emitting Phosphors M2P2O7:1%Eu2+ (M = Ca, Sr, Ba) Pyrophosphates for LED Lighting. In: Bouraoui, T., et al. Advances in Mechanical Engineering and Mechanics II. CoTuMe 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-86446-0_26
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