Controlled synthesis and luminescence properties of NaLnW2O8 nanocrystals

Controllable Synthesis of NaLu(WO4)2:Eu3+ Microcrystal and Luminescence Properties for LEDs

“…This transition of final product from a blend of intermediates (x < 0.4) to a pure tetragonal NaLu 1−x Eu x (WO 4 ) 2 phase (x ≥ 0.4) as Eu 3+ doping concentration increases can be explained by ionic radius among lanthanide ions for large ionic radius favors the formation of scheelite-like NaRE(WO 4 ) 2 structure. 22 Higher reaction temperature may facilitate the preparation of these samples with high concentration of Lu 3+ ions, but the temperature is beyond the upper limit of the Teflon container. 23 The electron microscopes were used to detect the morphology and crystal structure of the samples Na-Lu 1−x Eu x (WO 4 ) 2 (x ≥ 0.4).…”

“…The final phase is a mixture of WO 3 and Na 2 W 2 O 7 without RE 3+ contained precipitation, revealed by XRD analysis in Figure S3, Supporting Information. This transition of final product from a blend of intermediates ( x < 0.4) to a pure tetragonal NaLu 1– x Eu x (WO 4 ) 2 phase ( x ≥ 0.4) as Eu 3+ doping concentration increases can be explained by ionic radius among lanthanide ions for large ionic radius favors the formation of scheelite-like NaRE(WO 4 ) 2 structure . Higher reaction temperature may facilitate the preparation of these samples with high concentration of Lu 3+ ions, but the temperature is beyond the upper limit of the Teflon container …”