Bundle-shaped β-NaYF4 microrods: Hydrothermal synthesis, Gd-mediated downconversion luminescence and ratiometric temperature sensing. Issue 7 (May 2018)

• Record Type: Journal Article
• Authors: Ding, Mingye; Hou, Jiajun; Cui, Zebo; Gao, Haobo; Lu, Chunhua; Xi, Junhua; Ji, Zhenguo; Chen, Daqin
• Is Part Of: Ceramics international. Volume 44:Issue 7(2018)
• Page Start: 7930
• Page End: 7938
• Publication Date: 2018-05
• Subjects: Sodium yttrium fluoride -- Gd-mediated emission -- Energy migration -- Optical thermometry; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.01.231
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, bundle-shaped β-NaYF4 microrods with uniform morphology and good monodispersity were successfully synthesized via a facile, template-free and environmentally-friendly hydrothermal route. According to the time-dependent experimental results, the formation mechanism for the crystal phase and shape evolution process has been proposed via the Ostwald-ripening process. Under single wavelength irradiation at 250 nm, intense multi-color downconversion emissions can be obtained by co-doping Ce 3+, Gd 3+ and X 3+ (X = Eu, Tb and Dy) into the as-synthesized β-NaYF4 crystals, in which Gd 3+ plays an intermediate role in transferring the excitation energy from sensitizer Ce 3+ to activators X 3+ . Furthermore, the temperature-dependent emission behaviors of β-NaY0.8 Gd0.2 F4 :Ce 3+ /X 3+ dual-emitting products have been systemically investigated to explore their possible application in self-calibrated optical thermometry. Impressively, the high temperature sensitivity, good signal discriminability and excellent thermal stability of the investigated dual-emitting phosphors making them a promising candidate for temperature sensing.