The two-dimensional (2D) crystallite morphology and low OH⁻/Ln³⁺ molar ratio of Ln₂(OH)₄SO₄·2H₂O (Ln = lanthanide) make it an ideal precursor for materials synthesis via phase conversion, which was manifested in this work by the direct generation of well-defined NaLn(WO₄)₂ phosphor particles via hydrothermal reaction with Na₂WO₄. Kinetics study showed that pure NaLn(WO₄)₂ can be produced by reaction at 180 °C for ~24 h or at 200 °C for ~6 h under WO₄²⁻/Ln³⁺ = 10 M ratio. Morphology analysis revealed that, though NaLn(WO₄)₂ evolved via re-precipitation, the layered crystal structure and 2D crystallite morphology of the precursor could have templated the nucleation/growth of NaLn(WO₄)₂, leading to uniform particles (~4–5 μm) of a unique microdisc-like morphology. Under 394 nm excitation, the Ln = La_0.95Eu_0.05 phosphor showed down-conversion luminescence having an absolute quantum yield of ~35.4%, a fluorescence lifetime of ~1.13 ms for its 616 nm main emission, and color coordinates of around (0.63, 0.37). Under 978 nm laser excitation, the Ln = La_0.97Yb_0.02Ho_0.01 and Ln = La_0.97Yb_0.02Er_0.01 phosphors exhibited the strongest up-conversion (UC) luminescence at ~660 nm (the ⁵F₅ → ⁵I₈ transition of Ho³⁺) and 551 nm (the ⁴S_3/2 → ⁴I_15/2 transition of Er³⁺), average fluorescence lifetimes of ~178.3 and 82.3 µs for the above emissions, and chromaticity coordinates of around (0.62, 0.38) and (0.25, 0.72), respectively. The two UC phosphors were also analyzed to exhibit UC luminescence through a two-photon mechanism.

二维（2D）的微晶的形态和低OH ^- / LN ³⁺ LN的摩尔比₂（OH）₄ SO ₄ ·2H ₂ O（Ln为镧系元素），使其通过相位转换为材料合成的理想的前体，其通过与Na ₂ WO _4发生水热反应直接生成定义明确的NaLn（WO ₄）₂荧光粉颗粒，可以在这项工作中得到证明。动力学研究表明，纯净的NaLn（WO ₄）₂可以通过在WO ₄ ^2- / Ln ³⁺下于180°C反应约24 h或在200°C反应约6 h来生产。 = 10 M的比率。形态分析表明，尽管NaLn（WO ₄）₂通过再沉淀而析出，但前体的层状晶体结构和二维微晶形态可能已经模板化了NaLn（WO ₄）₂的形核/生长，从而导致了均匀的颗粒（〜 4–5μm）的独特的类似碟片的形态。在394 nm激发下，Ln = La _0.95 Eu _0.05磷光体显示下转换发光，其绝对量子产率为〜35.4％，其616 nm主发射的荧光寿命为〜1.13 ms，色坐标约为（0.63， 0.37）。在978 nm激光激发下，Ln = La _0.97 Yb _0.02 Ho _0.01Ln = La _0.97 Yb _0.02 Er _0.01荧光粉在〜660 nm（Ho ³⁺的⁵ F ₅  →  ⁵ I ₈跃迁）和551 nm（⁴ S _3/2  → 对于上述发射，Er ^3+的4 I _15/2跃迁，平均荧光寿命为〜178.3和82.3 µs，色度坐标分别为（0.62，0.38）和（0.25，0.72）。还通过两个光子机制分析了两种UC磷光体以显示UC发光。