Tunable morphologies, multicolor properties and applications of RE³⁺ doped NaY(MoO₄)₂ nanocrystals via a facile ligand-assisted reprecipitation process

Abstract

Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol-gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable. With the development of nano optoelectronic devices and bioluminescence labeling, there is an urgent need to find an efficient method to prepare nanoscale, monodispersed and NaY(MoO4)2:RE3+ nanocrystals (NCs) with good crystallinity and stronger emission properties. In this work, we demonstrate a simple, fast, reproducible and one-step synthesis of NaY(MoO4)2:Eu3+ NCs with sizes varying from 1-20 nm via a ligand-assisted reprecipitation strategy. The reaction mechanism and emission intensities of NaY(MoO4)2:Eu3+ NCs with various morphologies have been discussed in detail. Furthermore, Tb3+ and Eu3+ ion co-doped NaY(MoO4)2 NCs were also prepared, and various emission colors were obtained and tuned from red, orange-red, yellow and yellow-green to green. Energy transfer between the Tb3+ and Eu3+ ions in the NaY(MoO4)2 host matrix has also been demonstrated. Finally, a highly efficient and stable NaY(MoO4)2:0.05Tb,0.04Eu NC-based W-LED device was built, which indicates the promising future application for this material in the field of lighting. The tunable multicolour emission, ease of preparation and nanosize reveal that NaY(MoO4)2:RE3+ NCs have a potential application in full color displays and W-LEDs.

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…More recently Ding et al . synthesized high‐quality RE‐doped NaY(MoO 4 ) 2 NCs using a ligand‐assisted reprecipitation strategy . The ET mechanism from Tb 3+ to Eu 3+ in the NaY (MoO 4 ) 2 host was observed and colour tuning could be achieved by adjusting the concentrations of Tb 3+ and Eu 3+ .…”

Europium doped-double sodium bismuth molybdate nanoparticles as contrast agents for luminescence bioimaging and X-ray computed tomography

“…Lanthanide (Ln)-doped double sodium rare-earth (RE) molybdates (NaRE(MoO 4 ) 2 ) have been the subject of increasing interest during the last few years due to their interesting luminescence properties, which make them useful for many applications in different fields such as catalysis, 1 lighting, [2][3][4] thermometry, 5 ionic conductivity, 6 and bioimaging. 7,8 Focusing on the latter application, the high atomic number (Z) of Ln confers to the NaRE(MoO 4 ) 2 compounds a strong capacity for X-ray attenuation.…”

Solvothermal Etching-Assisted Phase and Morphology Tailoring in Highly Porous CuFe2O4 Nanoflake Photocathodes for Solar Water Splitting

“…Apart from solar energy, hydrogen energy is considered to be the second most important source of clean, renewable energy. , Photocatalysis and photoelectrochemical water electrolysis can provide an efficient and economical pathway toward solar hydrogen generation from water while leaving behind a low carbon footprint. Since the discovery of semiconductor photolysis of water using TiO 2 by Fujishima and Honda, research on efficient nanostructured semiconductors has reached widespread attention in the scientific community, especially in the past few decades, after the advent of advanced and improved cutting-edge nanofabrication techniques. − Transition-metal oxides have seen an upsurge in this research field, primarily because of their desirable properties, such as low cost, abundance, stability, ease of synthesis, and impressive photocatalytic performance. − An extensive range of metal oxides has been explored over the years, such as TiO 2 , SnO 2 , WO 3 , Fe 2 O 3 , and many synthetic strategies have been employed, such as morphology control, doping, design of efficient heterojunctions, and crystal facet engineering, to improve photoelectrochemical performance. ,− In this field of work, spinels have gained a strong foothold, because of their high stability on alkaline media, desirable bandgap, low cost, efficient electron transport, and photoexcited charge carrier generation properties. − Many spinel ferrites have been explored for photoelectrochemical and photocatalytic water splitting in recent times, the most popular being NiFe 2 O 4 , CoFe 2 O 4 , and CuFe 2 O 4 . − Dillert et al and Zhao et al have beautifully reviewed the application of ferrites in photocatalysis and photoelectrochemical water splitting and emphasized structural properties and experimental investigations of ferrites. Yin et al showed the effect of transition-metal doping in hematite nanoparticles to form spinel ferrites and found an enhancement in charge carrier density and photoelectrochemical performance.…”