Comparative Investigation of Green and Red Upconversion Luminescence in
3+ Doped and Er 3+/ Yb 3+
Codoped La Er OCl
Pure tetragonal La
OCl: 3+ and La Er OCl: 3+/ Yb 3+ samples possessing upconversion ( Er UC)
luminescence behavior were synthesized using a simple solid‐state reaction method and the structural properties were investigated using X‐ray diffraction, crystal structure analysis, and SEM, respectively. The UC spectroscopic properties
of 3+ doped and Er 3+/ Yb 3+ codoped La Er OCl were studied in terms of UC emission spectra. The
intense green and red emissions around 528, 550, and 662 nm corresponding to the 2 11/2→4 H 15/2, 4 I 3/2→4 S 15/2,
and 4 I 9/2→4 F 15/2 transitions of I 3+ ions were observed for La Er OCl: 3+
sample under excitation at 980 nm, and the power studies indicated that two‐photon processes were responsible for the green and red upconversion luminescence. The bright green emission is visible to the naked eyes for La Er OCl: 3+.
A great enhancement of the visible upconversion emissions in Er 3+/ Yb 3+‐codoped sample was observed, furthermore, it is interesting to find the bright red emission for La Er OCl: 3+/ Yb 3+
samples. The mechanisms for the green and red Er UC luminescence, especially the enhancement of red UC emission were discussed based on the law of UC intensity versus pump power and their lifetimes.
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Document Type: Research Article
Publication date: October 1, 2012