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Inne
Temperature dependence of 4fn-1 5d1 → 4fn luminescence of Ce3+ and Pr3+ ions in Sr2GeO4 host.
Autorzy
Rok wydania
2018
Czasopismo
Numer woluminu
198
Strony
163-170
DOI
10.1016/j.jlumin.2018.02.034
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Photoluminescence of Ce3+- and Pr3+-activated Sr2GeO4 powders was measured between 17 and 600 K. For both ions strong 4fn−15dn→4fn (d-f) emission is observed at low temperatures, around 410 nm (Ce3+) and 280 nm (Pr3+). The Ce3+ d-f emission quenches starting at 150 K and disappearing completely just above room temperature. Pr3+ d-f luminescence shows an onset of quenching also around 150 K and disappears completely between 250 and 300 K. For Pr3+ quenching of the d-f emission was connected with an increasing intensity of the 3P0 luminescence at first and 1D2 emission at even higher temperatures. Both these 4fn→4fn emissions were observed up to 600 K. Based on the similar quenching temperatures, thermally stimulated photoionization of the 5d electrons from 5d level of Ce3+ or Pr3+ to the conduction band is proposed as the most probable mechanism for quenching of the d-f emissions.
Słowa kluczowe
Thermal quenching, d→f luminescence, Strontium germanate, Pr3+, Ce3+
Adres publiczny
https://doi.org/10.1016/j.jlumin.2018.02.034
Strona internetowa wydawcy
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