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Green and red up-conversion emissions of Er3+–Yb3+-codoped Al2O3 powders prepared by the nonaqueous sol–gel method by B. Dong; C.R. Li; M.K. Lei is a Materials Science article available to read on EtoBox.

What is Green and red up-conversion emissions of Er3+–Yb3+-codoped Al2O3 powders prepared by the nonaqueous sol–gel method about?

The 1 mol% Er 3+ -and 0-20 mol% Yb 3+ -codoped Al 2 O 3 powders have been prepared by the nonaqueous sol-gel process using aluminum isopropoxide as precursor, acetylacetone as chelating agent, nitric acid as catalyzer, and hydrated erbium and ytterbium nitrate as dopant under isopropanol environment. The two crystalline types of doped Al 2 O 3 , g and y, and a stoichiometric compound, (Yb,Er) 3 Al 5 O 12 , were obtained for all the Er 3+ -Yb 3+ -codoped Al 2 O 3 powders at the sintering temperature of 1000 1C. The maximal intensity of both the green and red up-conversion emissions centered at about 523, 545, and 660 nm was observed for the 1 mol% Er 3+and 10 mol% Yb 3+ -codoped Al 2 O 3 powders. The intensity ratio of the red to green up-conversion emission (I red /I green ) increased with increasing the Yb 3+ doping concentration for the Er 3+ -Yb 3+ -codoped Al 2 O 3 powders. Furthermore, the intensity ratio of the green upconversion emission at about 523 to 545 nm (I 523 /I 545 ) was proportional to the Yb 3+ doping concentration and pump electric current, which was associated with the elevated temperature of powders.

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Author

B. Dong; C.R. Li; M.K. Lei

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2313)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)