Yttrium-based metal-organic frameworks: Controllable synthesis, growth mechanism and the phase transformation to Y2O3:Eu3+ phosphors

• Published in: Journal of luminescence 2019-10, Vol.214, p.116567, Article 116567
• Main Authors: Yang, Ting, Xiang, Qirui, Feng, Li, Dong, Chengli, Zhang, Xinru, Ning, Zhanglei, Lai, Xin, Gao, Daojiang
• Format: Article
• Language: English
• Subjects: Controllable synthesis; Metal-organic framework; Morphology; Phosphor
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2019.116567

Hierarchically uniform three-dimensional allium giganteum-like yttrium-based metal-organic framework architectures (Y-MOFs) have been successfully synthesized with use of polyvinylpyrrolidone (PVP) by a modified hydrothermal method. The allium giganteum-like architectures are made up of a large amount of nano-sheets. The morphology and grain size of the samples can be easily adjusted through the elaborate choice of reaction time and the content of PVP additives. A possible growth mechanism is proposed in detail. Under the UV light excitation, the Y-MOFs: xEu (x = 1, 2, 5, 10, 20, 50%) samples exhibit a strong red luminescence. The luminescence intensity increases first and then decreases with x value increasing, showing a maximum at x = 10%. Furthermore, the shape-preserved Y2O3:Eu3+ phosphors can be easily obtained via a heat-treating in the air using the corresponding MOFs as a precursor, which exhibit characteristic red emission and excellent thermal stability. [Display omitted] •Allium giganteum-like Y-MOFs have been prepared via a hydrothermal method.•The morphological evolution of the Y-MOFs is systematically investigated.•The effect of Eu3+ content on structure and the PL properties are studied.•Shape-preserved Y2O3 can be obtained by a simply heat-treating method.•Y2O3:Eu exhibit characteristic red emission and excellent thermal stability.