Rare earth magnets doped orthophosphate Materials and VUV luminescence
Rare-earth doped luminescent materials are phosphate material is an important part. Eu2 +, Eu3 +, Ce3 + and Tb3 + as a doping agent, is widely used in the phosphor; is phosphate materials in its vacuum ultraviolet (VUV, Vacuum Ultraviolat) area of effective absorption and luminescence characteristics of the plasma display (Plasma Display Panel, PDP) and the lighting concern. Of rare earth doped phosphate, VUV luminescence, looking for PDP applications of luminescent materials have practical significance.
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This paper chose orthophosphate NaSrxBa1-x (PO4), SrZn2 (PO4) 2, NaCaPO4, Na2CaMg (PO4) 2 as the matrix material, the use of high temperature solid state sintering method and sol-gel method of rare earth ions Eu2 +, Eu3 +, Ce3 + and Tb3 + doped light-emitting materials. Respectively, on the rare earth (Eu2 +, Eu3 +, Ce3 +, Tb3 +) doped orthophosphate structure and the four light-emitting properties were characterized, on the material under the VUV excitation luminescence from color, attenuation and other aspects of the analysis described , and its luminescence mechanism and application properties were discussed.
Chapter X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) and other testing methods, the material composition, structure and morphology were characterized. NaSr0.55Ba0.45 (PO4): RE strong absorption in VUV region peaks from the matrix material to the conduction band electrons from the valence band transition absorption, ultraviolet (UV) absorption zone is from the rare earth ion energy levels transitions between: Eu2 + ions from the absorption peak of the 4f7 → 4f65d transition, Ce3 + absorption peaks from 4f → 5di (i = 1, 2, 3, 4, 5) transition, Tb3 + 7F6 from the absorption peak → 4f75d1 transition. Of luminescence spectra and chromaticity coordinates shown in the VUV light excitation, NaSr0.55Ba0.45 (PO4): Eu2 + and NaSr0.55Ba0.45 (PO4): Ce3 + can produce blue light, NaSr0.55Ba0.45 (PO4): Tb3 + a green light. Discussed the VUV excitation, luminescence decay curves calculated luminous life.
Chapter X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) of the test results, indicating that the prepared Na2CaMg (PO4) 2: Eu2 + and Na2CaMg (PO4) 2: Ce3 + material is pure phase material. Discuss the excitation spectrum of the absorption peak corresponding to the Eu2 + ion 4f7 → 4f65d transition and Ce3 + ions in the 4f → 5di (i = 1, 2, 3, 4, 5) transition, and the VUV region host absorption; emission spectrum and chromaticity coordinates indicating Na2CaMg (PO4) 2: Eu2 + and Na2CaMg (PO4) 2: Ce3 + are pure blue emission.
Chapter tests and analysis of the Ce3 + and Eu3 + ions SrZn2 (PO4) 2 luminescent properties of materials. Excitation spectrum contains the VUV-UV area by the host absorption resulting absorption transition, Eu3 + ion 7F0 → 5L8, 9,7 F0 → 5G3 (5L7), 7F0 → 5D3, 7F0 → 5D2 transitions in the absorption peak, or Ce3 + ion 4f → 5d (i) (i = 1, 2,3, 4, 5) transitions of the absorption peak, in addition to oxygen ions from the gap (O2-) and charge transfer between Eu3 + absorption produces. Luminescence spectrum and chromaticity coordinates indicating, SrZn2 (PO4) 2: Eu3 + can produce orange-red light, SrZn2 (PO4) 2: Ce3 + luminescence is a blue light.
Chapter VI with the sol-gel method using a NaCaPO4: Eu3 + nanoparticles were X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) and other tests. Prepared by sol-gel NaCaPO4: Eu3 + phosphor with uniform size, regular morphology. Discuss the excitation spectrum of the absorption peak corresponding to the Eu2 + ion 4f7 → 4f65d transition and Eu3 + ions in the 7F0 → 5L8, 9,7 F0 → 5G3 (5L7), 7F0 → 5D3, 7F0 → 5D2 transition, and the VUV region host absorption, and discussed under the excitation spectrum of Eu3 + ions doped in the position in NaCaPO4; emission spectrum and chromaticity coordinates indicating the NaCaPO4: Eu3 + have orange-red shade.
This occurs through the excitation and VUV spectra, chromaticity coordinates, decay curve analysis, characterize the NaSrxBa1-x (PO4), SrZn2 (PO4) 2, NaCaPO4, Na2CaMg (PO4) 2 is the four phosphate in Eu2 +, Eu3 + , Ce3 + or Tb3 + luminescence properties under doping, to discuss the mechanism of its light to explore the material in the field of plasma display and lighting potential applications.
