| Autor: |
Li, Anming, Li, Xuanbo, Guo, Yansheng, Liu, Dengfei |
| Předmět: |
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| Zdroj: |
Journal of Materials Science: Materials in Electronics; Sep2022, Vol. 33 Issue 26, p20992-20999, 8p |
| Abstrakt: |
In this work, GdF3 and NaGdF4 nano/submicro-crystals are selectively synthesized via a simple hydrothermal method. By merely adjusting the amounts of sodium citrate added in the precursor solutions, GdF3 and NaGdF4 nano/submicro-particles with different upconversion emission colors and luminescent decay lifetimes can be controllably synthesized, which is confirmed by XRD, SEM and spectroscopic analyses. The particle sizes of NaGdF4 nano/submicro-spheres decrease gradually from 230 to 100 nm with increasing Na3Cit dosages from 0.4 to 1.0 mmol. Under 980 nm laser excitation, GdF3:Yb3+/Ho3+ and NaGdF4:Yb3+/Ho3+ nano/submicro-crystals exhibit yellow-green and orange upconversion luminescence with four intense emission bands. Due to surface quenching effects, the emission intensities of NaGdF4:Yb3+/Ho3+ nanocrystals decrease with decreasing particle sizes. NaGdF4:Yb3+/Ho3+ nanocrystals possess shorter decay times than GdF3:Yb3+/Ho3+. The electronic transition processes for upconversion photoluminescence of Yb3+/Ho3+ are further identified. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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