1540nm fiber laser excited upconversion luminescence in erbium-doped lead–fluoride nanocrystals

Add time:09/30/2019    Source:infona.pl

Upconversion luminescence in erbium-doped PbGeO 3 –PbF 2 –CdF 2 -based vitroceramic under 1540nm infrared excitation is investigated. Luminescence signals around 410, 525, 550, 660 and 850nm were generated and attributed to the 2 H 9/2 , 2 H 11/2 , 4 S 3/2 and 4 F 9/2 transitions to the 4 I 15/2 ground-state, and 4 S 3/2 – 4 I 13/2 , respectively. The erbium ions excited-state emitting levels were populated through a combination of stepwise ground-state absorption, phonon-assisted excited-state absorption and cross-relaxation processes. The results also disclosed that all emission signals obtained with vitroceramic samples presented intensities three times higher when compared to the precursor glass samples. In addition, the red emission signal at 660nm for 1540nm pumping exhibited an expressively high intensity when compared to the green signal.

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