Synthesis, Characterization, and Spectroscopy of NaGdF₄:  Ce³⁺, Tb³⁺/NaYF₄ Core/Shell Nanoparticles

One‐Pot Synthesis of Carboxyl‐Functionalized Rare Earth Fluoride Nanocrystals with Monodispersity, Ultrasmall Size and Very Bright Luminescence

“…As shown in Figure 4 (b), the four main peaks of the emission spectrum in the range 450-650 nm are assigned to the 5 D 4 Ǟ 7 F J (J = 6-3) transitions of Tb 3+ ions under 248 nm excitation. [7,20] In addition, similar luminescent properties were also observed in the LaF 3 :Ce 3+ /Tb 3+ solution ( Figure S6). The quantum yield (QY) is an important parameter to characterize the luminescent efficiency of RE fluoride nanocrystals.…”

“…[2,6] To date, various synthesis approaches have been reported to successfully obtain the RE fluoride nanocrystals. [6][7][8] Most of these synthesis approaches involved the use of high-boiling organic solvents, such as oleic acid, 1-octadecene, and oleylamine. Although the colloidal nanoparticles synthesized using high-boiling organic solvents have high-quality crystallinity, narrow size distribution, and tunable shape, their hydrophobicity in nature and lack of surface functional groups (-COOH, -NH 2 , or -SH) limit their application in significant fields, such as bioassay, imaging, and therapy.…”

Controllable Synthesis and Luminescence Properties of La(OH)3 and La(OH)3:Tb3+ Nanocrystals with Multiform Morphologies

“…[36][37][38][39] The excitation spectrum of the La(OH) 3 :Tb 3+ nanowires (Figure 5a) is composed of a broad band centered at 240 nm and some sharp bands in the region from 275 to 400 nm. The broad band and small peaks at 275 and 289 nm are ascribed to the spin-allowed and spin-forbidden interconfigurational 4f…”

Nonblinking and Nonbleaching Upconverting Nanoparticles as an Optical Imaging Nanoprobe and T1 Magnetic Resonance Imaging Contrast Agent

“…S2 in the Supporting Information). [9] After encapsulation with poly(ethylene glycol) (PEG) phospholipids, TEM images and dynamic light scattering (DLS) data showed that UCNPs were dispersed in water without any detectable degradation or aggregation (Fig. S3, S4 in the Supporting Information).…”

“…[5] were essentially similar to those reported previously. [4,[7][8][9] The upconversion efficiencies (i.e., spectral intensities) of 20 nm and 41 nm UCNPs were compared at fixed particle concentrations and it was found that the 41 nm UCNPs showed about 15 times more intense emission than the 20 nm particles in chloroform. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis showed that the 41 nm particles contained 7.5 times more Yb 3þ and Er 3þ ions than the 20 nm particles.…”