Tm³⁺‐Doped Y₂O₃ Nanocrystals: Rapid Hydrothermal Synthesis and Luminescence

Abstract

Tm3+ -doped Y 2 O 3 nanocrystals were prepared via hydrothermal conditions at high autogenous pressure (ca. 40 MPa) using batch reactors at 220 and 250°C for very short periods of reaction time (10 min). The as-prepared materials were identified as Y(OH) 3 nanoparticles. The precursor materials with two types of morphologies, such as sphere and rodshaped particles were prepared at 220 and 250°C within 10 min. The sizes of the as-prepared sphere particles are 10-15 nm in diameter, whereas the rod-shaped particles show

Hydrothermal synthesis of one-dimensional yttrium hydroxide particles by a two-step alkali-addition method

“…Recently, photoluminescence from Y 2 O 3 phosphors that have one-dimensional (1D) shape has been reported with fundamental and practical interests. [1][2][3][4] Since Y 2 O 3 can be produced by transformation from Y(OH) 3 through a calcination process, e.g. at 500 uC for 2 h, 5 synthesis of Y(OH) 3 particles is one of the important processes to obtain well-controlled Y 2 O 3 phosphors including their 1D shape.…”

“…For instance, Y 2 O 3 has been transformed into 1D Y(OH) 3 in water, 8 in sodium hydroxide solution, 8 and in acetic acid solution 9 after digestion at 170-200 uC for 24-48 h. Alkalized Y 3+ aqueous solution has also been applied both in the presence 5,10 and absence of additives. 2,4,11,12 Although organic substances such as polyethylene glycol, methyl methacrylate, etc., have been employed as the shape controller in the former cases, the latter reports suggest that the anisotropic growth of Y(OH) 3 is the intrinsic nature of Y(OH) 3 , probably due to the crystal structure as pointed out by Fang et al 8 In spite of these progresses in preparation methods for 1D Y(OH) 3 particles however, there seem to be few reports focusing on the size control of 1D Y(OH) 3 particles even though it is potentially important for applications. In addition, it also seems that the formation mechanism has not been sufficiently elucidated.…”

Structural and optical properties of europium doped Y2O3 nanoparticles prepared by self-propagation room temperature reaction method

“…For preparation of submicron particles and nanoparticles of sesquioxides, various soft chemistry methods have been developed. These methods include hydrothermal synthesis [7], co-precipitation [8], sol-gel [9], combustion [10,11], spray pyrolysis [12,13], etc. Taking into account that the properties of materials at nanoscale strongly depend on their dimensions and morphologies, the search of novel methods for preparation of nanomaterials and study of their characteristics are of high interest of researchers.…”