Compositional Dependence of Upconversion Luminescence of Er3+ in ZrF4-Based Glasses: III. Anion Substitution Effect
✍ Scribed by Y. Kawamoto; R. Kanno; R. Yokota; M. Takahashi; S. Tanabe; K. Hirao
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 241 KB
- Volume
- 103
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
As one of the compositional designs for enhancing the unconversion luminescence efficiency of (\mathrm{Er}^{3+}) in (\mathrm{ZrF} \mathrm{F}{4})-based glasses. the amion substitution elfect has been examined in glasses (582 \mathrm{rF}{4} \cdot(39-\mathrm{r})) BaF (\mathrm{F}{2}). (x) Ba (X{1} \cdot 3) IEr(ar E Et)F, (x=0-29) for (X=C 1) and (x=0-10) for (X=B r) in batch compositions). Prominent enhancement af upeonversion emission intensily was observed on the substitution of (\mathrm{CI}) for (\mathrm{F}) : The (\mathrm{Cl}) substitution brought about two effects. of which one was an increase in the deviation from inversion symmetry in the (\mathrm{F}^{-})coordination around (\mathrm{Er}^{3+}) and the other was an increase in both phonon energy and electron-phonon coupling strength. The former raises the transition probability in the upconversion process, leading to an enhancement of the emission intensity, while the latter increases the multiphonon relaxation in the upconversion process, leading to a reduction of the emission intensity. Due to these antithetical effects on the upconversion process, the upconversion emission intensity of the (\mathrm{Cl}) substituted glasses exhibits a maximum value around the (58 \mathrm{ZrF}{4} \cdot 20 \mathrm{BaF}{2} \cdot 19 \mathrm{BaCl}{2} \cdot 3 \mathrm{ErF}{3}) composition. The substitution of small amoums of (\mathrm{Cl}) for (\mathrm{F}) is concluded to be quite effective for enhancing the upconversion efficiency of (\mathrm{ZrF}_{4})-based glasses. 1993 Academic Press. thc.