Tm) were synthesized by sol-gel method. Techniques such as thermogravimetric and differential thermal analysis(TGA-DTA)
X-ray powder diffraction(XRD)
transmission electron microscopy(TEM)
photoluminescence emission and excitation spectra were used to characterize the phosphors. The results showed that the synthesized samples were pure phase with trigonal crystal structure when the calcination temperature was from 800℃ to 1 200℃. Under UV light excitation
the doped rare earth ions exhibited f-f feature level transitions. The doped ions gave the strongest emission when the doped concentration (
x
) of Eu
3+
Tb
3+
Sm
3+
and Tm
3+
was 0.02
0.04
0.005 and 0.005
and gave red
green
orange and blue emission
respectively. Eu
3+
-Tb
3+
Eu
3+
-Sm
3+
and Eu
3+
-Tm
3+
co-doped samples were likely to emit white light.
关键词
Keywords
references
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