Journal article

Authors list: Wehner, T; Heck, J; Feldmann, C; Müller-Buschbaum, K

Publication year: 2016

Pages: 7735-7743

Journal: Journal of Materials Chemistry C Materials for optical and electronic devices

Volume number: 4

Issue number: 33

ISSN: 2050-7526

DOI Link: https://doi.org/10.1039/c6tc01920j

Publisher: Royal Society of Chemistry

Abstract: 
The photoluminescence of the dispersions of zirconyl flavinmononucleotide nanoparticles (ZrO[FMN]: FMN = flavinmononucleotide) in pyridine was deliberately influenced by the addition of rare earth halides LnCl(3), resulting in a modification to core/shell structures with the nanoparticle as the core. The particle dispersion's original intense green luminescence of the flavin chromophore can therefore be shifted in chromaticity from green via white to blue. The shift depends on the reaction conditions as well as on the rare earth halide. Heating of the systems during the modification initiates these chromaticity shifts and they remain even after cooling to room temperature. For Ln = Y, La and Ho, all three halides can be used to create a broad band white light emission with a high general colour rendering index (CRI) of 84-88. The colour shift starts at 180 degrees C for Y and La, whereas HoCl3 addition already approaches the white point at 200 degrees C, whereas unmodified dispersions of ZrO( FMN) do not show a chromaticity shift at this temperature. The La-modified dispersion requires 250 degrees C to emit white light. The luminescence of the modified nanoparticles is also temperature dependent upon cooling to low temperatures, which shifts the colour point to intense blue for Y and La at -196 degrees C. Determination of the photoluminescence lifetimes indicates the modification of the chromophore and no solvent participation.

Harvard Citation style: Wehner, T., Heck, J., Feldmann, C. and Müller-Buschbaum, K. (2016) White light emission and temperature dependent chromaticity shifts by modification of luminescent ZrO(FMN) nanoparticles with rare earth halides, Journal of Materials Chemistry C Materials for optical and electronic devices, 4(33), pp. 7735-7743. https://doi.org/10.1039/c6tc01920j

APA Citation style: Wehner, T., Heck, J., Feldmann, C., & Müller-Buschbaum, K. (2016). White light emission and temperature dependent chromaticity shifts by modification of luminescent ZrO(FMN) nanoparticles with rare earth halides. Journal of Materials Chemistry C Materials for optical and electronic devices. 4(33), 7735-7743. https://doi.org/10.1039/c6tc01920j