Multifunctional green-emitting core/shell nanophosphor doped with lanthanide ions

Multifunctional green-emitting core/shell nanophosphor doped with lanthanide ions
nanoparticles; multifunctional; doping; photoluminescence
Issue Date
15th Asian Chemical Congress
Lanthanide ion (Ln3+ ion)-doped inorganic nanocrystals have been extensively investigated over the past decades. In particular, studies on Yb3+ and Er3+-doped upconversion nanophosphors (UCNPs) have been explosively increased due to their exceptional advantages such as high conversion efficiency from infrared (IR) light to visible light, no photoblinking, no photobleaching, large antistokes shift, narrow emission peak width, chemical stability, low toxicity, and so on [1,2]. Recently, it was reported that Ln3+ ion doping simultaneously affects phase and size of the nanocrystals [3]. By help of Ln3+ ion doping, single β-phase NaYF4:Yb,Er, which is known as one of the most efficient upconversion (UC) phosphors, can be synthesized with sub 10-nm size without decreasing reaction temperature or shortening reaction time. Ultrasmall β-NaYF4:Yb,Er UCNPs with the size of ca. 8.3 nm were synthesized by Gd3+ doping. However, it was found that UC photoluminescence (PL) intensity was dramatically decreased with the decrease of the particle size. It was attributed to highly increased surface defects per unit volume [4]. To solve this problem, inorganic shell was epitaxially grown on the sub-10 nm UCNP core and it caused the PL intensity to increase significantly. In addition, we epitaxially grew luminescent shell with magnetic properties on the ultrasmall UCNP cores. Intense green-emitting β-NaGdF4:Ce,Tb luminescent shell was coated on the ultrasmall β-Na(Y,Gd)F4:Yb,Er UCNP core [5]. As a result, the core/shell nanophosphors (NPs) exhibit bright green light under the illumination of ultraviolet light as well as IR light. Along with the dual-mode green emission, the core/shell NPs showed paramagnetism. In this talk, luminescent and magnetic properties of the dual-mode green-emitting core/shell NPs will be presented.
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