A structural topotactical transformation synthetic strategy for Y2O2S:Ln3+ micro/nanocrystals with multicolor emissions. Issue 4 (24th December 2019)

• Record Type: Journal Article
• Authors: Shao, Baiqi; Yuan, Senwen; Zhao, Shuang; Dong, Langping; Zhang, Liang; You, Hongpeng
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 4(2019)
• Page Start: 1440
• Page End: 1447
• Publication Date: 2019-12-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc06182g
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A novel topotactic transformation synthetic strategy towards Y2 O2 S:Ln 3+ with multicolor emissions was contrastively developed based on topotactic structural matching. Abstract : Designing the synthesis of inorganic micro/nanocrystals that are hard to get through conventional synthetic routes remains a challenging issue. Herein, we developed a novel in situ topotactic transformation synthetic strategy towards Y2 O2 S micro/nanocrystals based on high topotactic structural matching with the crystalline relationship between [001]Y4 O(OH)9 NO3 //[001]Y2 O2 S and [001]LYH//[010]Y2 O2 S (LYH is Y2 (OH)5 NO3 · n H2 O). We have contrastively elucidated the in situ topotactic transformation mechanism from the crystal structure point of view and found that the microscopically topotactic structural matching in structural anisotropy and atomic arrangement facilitates the Y4 O(OH)9 NO3 → Y2 O2 S and LYH → Y2 O2 S transformation processes, respectively. Interestingly, the morphology contours were maintained well although a high degree of crystal lattice rearrangement was involved during the topotactic transformation process, which contributed to two brand-new morphologies that were unavailable by the conventional synthetic route (hexagonal microprism and quadrangle nanoplate) for Y2 O2 S. Besides, we also selected amorphous Y(OH)CO3 sub-microsphere as a precursor to comparatively study the structural topotactic transformation. Furthermore, the luminescence properties of the as-prepared micro/nanophosphors were emphasized by featuring the multicolor emissions by downshifting (Eu 3+, Tb 3+ ) and upconversion (Yb 3+ /Er 3+, Yb 3+ /Tm 3+ ) luminescence. Our study may bring a new direction of thought for the targeted synthesis of inorganic micro/nanocrystals that are difficult to get via conventional synthetic routes.