Up-conversion emission properties and unexpected white light emission from Er³⁺/Yb³⁺doped Gd₂O₃nanophosphors

Exploring the intra-4f and the bright white light upconversion emissions of Gd2O3:Yb3+,Er3+-based materials for thermometry

“…The temperature increase within the excitation region with P D , 32 can also explain the decrease of the integrated UC emission intensities above a given value of P D (see Fig. 2(c and d)), the so-called absorption saturation regime.…”

“…Er(NO 3 ) 3 ·5H 2 O (99.9%), Yb(NO 3 ) 3 ·5H 2 O (99.9%), Gd(NO 3 ) 3 6H 2 O (99.9%) were purchased from Sigma-Aldrich and NH 2 CH 2 COOH (glycine) (>99%) from Alfa Aesar and used as received. A modified co-precipitation procedure reported by Bilir et al 32 was used to prepare the (Gd 0.89 Yb 0.10 Er 0.01 ) 2 O 3 nanoparticles, denoted as 1 . The starting reagents were dissolved in 1 mL of deionized water under vigorous stirring for 15 min.…”

White Light Emitting Gadolinium Oxide Nanoclusters for In‐vitro Bio‐imaging

“…The broad spectrum yielded a color chromaticity index coordinate of (0.33, 0.37), which can be attributed to pure white light (Commission Internationale de l′Elcairage (CIE)–0.33,0.33) [19,48] (Figure 2, b). It is important to note that, so far, most of the known routes have adopted two methods: (i) optimized mixing of red, green, and blue light‐emitting dye together to obtain WLE material, [49] and (ii) doping of rare earth metals like Er 3+ and Yb 3+ to different hosts using the different synthetic methods [50,51] . However, the current study has employed a simple, affordable, non‐toxic, green synthetic route to obtain WLE from a single material, a unique feature.…”

“…It is important to note that, so far, most of the known routes have adopted two methods: (i) optimized mixing of red, green, and blue light-emitting dye together to obtain WLE material, [49] and (ii) doping of rare earth metals like Er 3 + and Yb 3 + to different hosts using the different synthetic methods. [50,51] However, the current study has employed a simple, affordable, non-toxic, green synthetic route to obtain WLE from a single material, a unique feature. Although, the nature of the luminescence emission by nanoclusters is still evolving.…”

Novel Sol-Gel Synthesis of Spherical Lead Titanate Submicrometer Powders

“…Therefore, the development of new techniques for the synthesis of particles with nanoscopic dimensions and well-defined shapes is currently a driving force for research. Several representative papers concerning properties and applications of nanomaterials were reported [1][2][3][4][5]. Several techniques have been tried for the synthesis of pure, homogeneous, and fine lead titanate powders.…”