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- Title
Selective synthesis and upconversion luminescence of GdF<sub>3</sub> and NaGdF<sub>4</sub> nano/submicro-crystals doped with Yb<sup>3+</sup>/Ho<sup>3+</sup>.
- Authors
Li, Anming; Li, Xuanbo; Guo, Yansheng; Liu, Dengfei
- Abstract
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.
- Subjects
PHOTON upconversion; PHOTOLUMINESCENCE; LASERS; CITRATES; SODIUM; LUMINESCENCE spectroscopy; LUMINESCENCE
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 26, p20992
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08904-4