Nd3+ sensitized Yb3+ luminescence in oleic acid functionalized LaF3: Nd3+Yb3+ nanoparticles

Abstract

The luminescence at the absorption maximum of c-Si solar cells (1002 nm) of Ytterbium (3+) ions (Yb 3+ ) make them a suitable candidate for solar spectrum converting material for c-Si solar cell. In this work oleic acid functionalized lanthanum fluoride (OA-LaF3) nanoparticles doped with Nd 3+ , Yb 3+ (2-5 nm) were synthesized by coprecipitation method in which Nd 3+ (Neodymium (3+) ions) acts as the sensitizer for Yb 3+ . The oleic acid chemisorption on LaF3 nanoparticles was confirmed by FTIR and TGA analysis. OA-LaF3: Nd 3+ Yb 3+ nanoparticles (Nd 3+ -10 mol%, Yb 3+ -0 to 20 mol% ) luminescent at 880 nm, 1053 nm, 1325 nm (Nd 3+ ions) and 1002 nm (Yb 3+ ions) was observed for excitation at 575 nm. The excitation spectra for the Yb 3+ emission from OA-LaF3: Nd 3+ Yb 3+ showed all the excitation peaks of Nd 3+ in the visible region. This confirmed the energy transfer from Nd 3+ to Yb 3+ ions. The increase in the Yb 3+ emission intensity at 1002 nm was observed as Yb 3+ dopant concentration increased from 0 to 5%. Above 5% of Yb 3+ doping concentration, Yb 3+ luminescence was observed to be decreasing, which was attributed to the concentration quenching.

Synthesis of RAFT‐Mediated Amphiphilic Graft Copolymeric Micelle Using Dextran and Poly (Oleic Acid) toward Oral Delivery of Nifedipine

“…These peaks correspond to the CO of –COOH group, the asymmetric stretching vibration of terminal CH 3 group (alkyl chain), and alkyl chain of CH 2 ( n < 4) that overlap with C–S stretching vibration, respectively. Besides, –OH, –CH, carboxyl group, and CS stretching vibrations appeared at 3406, 2926, and 1010 cm −1 , indicating the successful synthesis of Dextran‐g‐OA graft copolymer …”