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Citric acid coated K2GdF7:Ce/Tb nanocrystals for broad and reversible photoluminescence pH sensing.
- Source :
-
Journal of Alloys & Compounds . Sep2020, Vol. 834, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- An pH-sensitive citric acid coated Ce/Tb:KGd 2 F 7 nanocrystals with a broad detection range from 3 to 10 is established. Under the 254 nm excitation, the Tb3+ emission intensity originated from Ce3+ → Gd3+ →Tb3+ decreases gradually with the increase of pH, while its intensity almost keeps unchanged in pH 3 to 6 and increases in pH 6 to 10 under the 311 nm excitation, which activates the ratiometric pH sensing with high sensitivity. An pH-sensitive citric acid coated Ce/Tb:KGd 2 F 7 NCs with a broad detection range from 3 to 10 is established. Under 254 nm excitation, the Tb3+ emission intensity decreases gradually with the increase of pH, while its intensity almost keeps unchanged below 6 and increased in pH 6 to 10 under 311 nm excitation. Image 1 • Citric acid coated Ce/Tb:KGd 2 F 7 NCs were prepared via a one-pot hydrothermal strategy. • Under the 254 nm excitation, the PL intensity decreases gradually with the increase of pH. • The intensity almost kept unchanged in pH 3 to 6 and increased in pH 6 to 10 under the 311 nm excitation. • A ratiometric pH sensing route with high sensitivity was obtained. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CITRIC acid
*TERBIUM
*NANOCRYSTALS
*PHOTOLUMINESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 834
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 143190993
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.155223