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

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• 作者：A.S. Gouveia-Neto ; L.A. Bueno ; R.F. do Nascimento ; E.A. da Silva ; E.B. da Costa
• 关键词：Glass ceramics ; Nanocrystals ; Luminescence ; Non-linear optics ; Upconversion ; Germanates ; Rare-earths in glasses
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2009
• 出版时间：1 April 2009
• 年：2009
• 卷：355
• 期：8
• 页码：488-491
• 全文大小：321 K

文摘

Upconversion luminescence in erbium-doped PbGeO₃–PbF₂–CdF₂-based vitroceramic under 1540 nm infrared excitation is investigated. Luminescence signals around 410, 525, 550, 660 and 850 nm were generated and attributed to the ²H_9/2, ²H_11/2, ⁴S_3/2 and ⁴F_9/2 transitions to the ⁴I_15/2 ground-state, and ⁴S_3/2–⁴I_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 660 nm for 1540 nm pumping exhibited an expressively high intensity when compared to the green signal.