In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 34, No. 4B ( 1995-04-01), p. L507-
Abstract:
The 70SnF 2 ·30P 2 O 5 glasses containing 25-500 ppm of fluorescein exhibit change in color from light yellow to reddish orange (absorption maximum, λ=500 nm) when heated at 240° C for 120-180 min. The fluorophosphate glasses also change the color from light yellow to reddish brown (λ=480 nm) when irradiated with 60 Co γ-rays of 5×10 4 Gy. The P-F stretching mode observed in the Fourier transformed infrared (FT-IR) spectra showed an increase in peak intensity along with the coloration, suggesting a cleavage of the weak chemical bond between fluoride ions ( F - ) and fluorescein molecules. The coloration is ascribed to change of the molecular structure of fluorescein from non-crystalline to crystalline type. ESR spectra of γ-ray irradiated 70SnF 2 ·30P 2 O 5 glasses showed a poorly resolved doublet, which was ascribed to a hole-trapped PO 3 F - center produced by electron scattering: PO 3 F 2- →PO 3 F - +e - .
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.34.L507
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1995
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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