Abstract
Various novel Ca2MgTeO6:Tm3+ blue-emitting tellurate materials were synthesized via solid-state reaction. The structure and phase purity of prepared Ca2MgTeO6:xTm3+ (x = 0.0025-0.10 mol) were examined by X-ray powder diffraction. The Ca2MgTeO6:Tm3+ phosphors emit blue emission at 359 nm excitation. The optimum doping concentration was 0.02 mol. The concentration quenching mechanism in the Ca2MgTeO6 host was due to the electric dipole-dipole interaction. The The CIE chromaticity coordinates of Ca2MgTeO6:Tm3+ phosphors located in the blue region. These results validated the Ca2MgTeO6:Tm3+ tellurate phosphor can be used as good blue-emitting candidate for W-LEDs.
Highlights
White light-emitting diodes (W-LEDs), phosphors-covered LEDs, have replaced traditional lighting sources owing to their energy conservation, long lifetime, high efficiency, and environment-friendly properties [1,2,3,4,5]
The powder X-ray diffraction (XRD), the photoluminescence excitation (PLE) properties, the photoluminescence emission (PL) spectra, and concentration quenching mechanism were investigated in depth
The as-prepared samples were with high phase purity
Summary
White light-emitting diodes (W-LEDs), phosphors-covered LEDs, have replaced traditional lighting sources (e.g., incandescent light, halogen tungsten lamp, and fluorescent lamp) owing to their energy conservation, long lifetime, high efficiency, and environment-friendly properties [1,2,3,4,5]. The common combination of commercial W-LEDs is that of blue. The other common method combines nearultraviolet (n-UV) LED chips with trichromatic phosphors (yellow-, blue-, and red-emitting phosphors). It is imperative to fabricate a novel blue-emitting phosphor with effective absorption in the near-UV region. Tm3+ is widely used as an efficient blue light emitting center , such as. Many alternative Tm3+-doped phosphors have been reported [14,15,16,17]. Ca2MgTeO6 ceramics were reported to a double perovskite family member and exhibited a monoclinic P21/n structure [18]. Ca2MgTeO6:Eu3+, Ca2MgTeO6:Sm3+ phosphors emitted bright red/orange-emitting light under UV excitation [19, 20]. The Tm3+-doped Ca2MgTeO6 phosphors had not been reported. Ca2MgTeO6 blue-emitting phosphor has been synthesized by solid-state reaction. The powder X-ray diffraction (XRD), the photoluminescence excitation (PLE) properties, the photoluminescence emission (PL) spectra, and concentration quenching mechanism were investigated in depth
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