Synthesis and luminescent properties of CaTiO3:Eu3+, Al3+ phosphors
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In this paper, defect-induced negative thermal quenching (NTQ) of Eu 2+ -doped phosphors is overviewed. NTQ denotes that the integrated emission intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. The NTQ phenomenon of Eu 2+ luminescence was reportedly observed in a broad variety of lattices. The NTQ of these Eu 2+ -doped phosphors was generally ascribed to thermally stimulated detrapping of the excitation light stored in defects (traps) and subsequent energy transfer from the defects to the Eu 2+ 5d levels. Validity of defect- induced NTQ of Eu 2+ -doped phosphors is assessed and factors that may contribute to the measured emission intensity of a given phosphor at elevated temperatures are discussed. It is suggested that it is debatable whether NTQ could be an intrinsic property of the blue-emitting phosphor Na 3 Sc 2 (PO 4 ) 3 : Eu 2+ , and whether the emission intensity enhancement with increasing temperature for Eu 2+ -doped phosphors could be related to energy transfer from defects. The temperature dependence of the measured emission intensity alone seems not to be a good measure for evaluating TQ property of a phosphor, since it is affected by not only the quantum efficiency of the phosphor but also some extrinsic factors at elevated temperatures.
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Orthosilicate
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green phosphors have been prepared by the solution reaction method and the photoluminescence and crystalline properties were studied as a function of both the firing temperature (~) and the concentration of Mn activator (x=0.01~0.20). Under 147 nm and 254nm and excitation sources, the emission intensity of the phosphors was increased about 4 times increasing firing temperatures from to . From the XRD analysis, :Mn phosphors fired above showed willemite crystal structure. Under 147nm excitation, the maximum emission intensity was obtained at the Mn concentration of x=0.02 for phosphors fired at and the concentration quenching was occurred at the Mn concentration above x=0.10. The phosphor particles showed almost spherical shapes with the average size of around 2~3 by the SEM morphology.
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Eu3+ activated LiBaPO4 phosphor with several emission peaks(589,594,619,655 and 692 nm),under the near ultraviolet light(401 nm) was synthesized by the high temperature solid state reaction method.And the phase present of the phosphor was characterized by powder X-ray diffraction(XRD),the spectrum of the phosphor was measured by a SHIMADZU RF-540 fluorescence spectrophotometer.It was found that the processing parameters,including the activator content and the charge compensator,affected the emission intensity and other luminescent properties.The emission intensity of LiBaPO4∶Eu3+ phosphor reaches the maximum at 5% Eu3+,and the concentration self-quenching mechanism is the d-d interaction by Dexter theory.When the charge compensator incorporated,the emission intensity of the phosphor can be enhanced.The results show that LiBaPO4∶Eu3+ is a promising red phosphor for white LED.
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SrZnO2:Eu3+,M+(M=Li,Na,K) red-emitting phosphors were prepared by low-temperature combustion synthesis(LCS).The effect of the sensitizer Li+,Na+ and K+ on the emission spectra of ZnSrO2: Eu3+ phosphor was studied.It was presented that the emission spectrum intensity of SrZnO2:Eu3+ phosphor was enhanced by co-doped with alkali metal ions,and the relative luminescence intensity was the highest while n(Eu3+):n(Li+) was 1:3.The theoretical reason for the above results was analyzed.
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Red-emitting Ca3-xEuxZrSi2O9 (0.05 ≤ x ≤ 0.30) single phase phosphors were synthesized using the conventional solid-state reaction method and their photoluminescence properties were characterized. These phosphors exhibited typical emission peaks assigned to the transition from 5D0 to 7FJ (J = 0, 1, 2, 3, and 4) of Eu3+. The highest emission intensity was obtained for Ca2.83Eu0.17ZrSi2O9, where the relative emission intensity was 84% of that for a commercial red-emitting Y1.94Eu0.06O3 phosphor. The concentration quenching of the Eu3+-related luminescence in the Ca3-xEuxZrSi2O9 (0.05 ≤ x ≤ 0.30) phosphors can be mainly attributed to dipole-dipole interaction.
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