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Blue to NIR down-conversion in Tm 3+ /Yb 3+ -codoped fluorozirconate glasses compared to Pr 3+ /Yb 3+ ion-pair

Abstract : Visible to near infrared down-conversion has been studied in Tm3+/Yb3+-codoped fluorozirconate glasses, namely ZBLA (57ZrF4-34BaF2-5LaF3-4AlF3 in mol%) and ZLAG (70.2ZrF4-23.4LaF3−0.6AlF3-5.8GaF3 in mol%). Upon blue excitation at 467 nm, Tm3+ doped glasses yield weak red at 650 nm and strong luminescence around 800 nm. With the addition of Yb3+, emission between 950 and 1100 nm from the Yb3+: 2F5/2 → 2F7/2 transition was observed. This emission well matched with the band gap of crystalline silicium. The mechanism responsible for down-conversion in the Tm3+/Yb3+ ion-pair is a down-shifting process. The highest energy transfer efficiency ηETE was 64.5% in ZBLA glasses doped with 0.75Tm3+/10Yb3+; this efficiency was mainly limited by the strong Yb3+ to Tm3+ back energy transfer. ηETE appeared to increase more rapidly with the addition of Yb3+ in ZLAG glasses, as already observed for the energy transfer in Pr3+/Yb3+ ion-pair. The origin of the difference between the two hosts is probably related to the distribution of rare-earth ions in the host matrix, as shown by molecular dynamics simulation. The Tm3+/Yb3+ system is found much less efficient that the Pr3+/Yb3+ one, because of less efficient quantum efficiency together with lower blue absorption of Tm3+ compared to Pr3+.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02147086
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Soumis le : mardi 4 juin 2019 - 14:12:56
Dernière modification le : mardi 18 janvier 2022 - 11:41:42

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Olfa Maalej, A. Lukowiak, Adel Bouajaj, Alessandro Chiasera, Giancarlo C. Righini, et al.. Blue to NIR down-conversion in Tm 3+ /Yb 3+ -codoped fluorozirconate glasses compared to Pr 3+ /Yb 3+ ion-pair. Journal of Luminescence, Elsevier, 2018, 193, pp.22-28. ⟨10.1016/j.jlumin.2017.09.021⟩. ⟨hal-02147086⟩

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