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Red-emitting Ca1-xSrxS:Eu2+ Phosphors as Light Converters for Plant-growth Applications

Published online by Cambridge University Press:  23 June 2011

Qi Xia ,
Miroslaw Batentschuk ,
Andres Osvet ,
Peter Richter ,
Donat P. Häder ,
Jürgen Schneider ,
Lothar Wondraczek ,
Albrecht Winnacker  and
Christoph J. Brabec
Qi Xia
Affiliation:
Chair WW6 Materials for Electronics and Energy Technology (i-MEET), University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany Materials Research Center, University of Freiburg, 79104 Freiburg, Germany
Miroslaw Batentschuk
Affiliation:
Chair WW6 Materials for Electronics and Energy Technology (i-MEET), University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Andres Osvet
Affiliation:
Chair WW6 Materials for Electronics and Energy Technology (i-MEET), University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Peter Richter
Affiliation:
Department Biology, Cell Biology Division, University of Erlangen-Nuremberg, Staudtstrasse 5, 91058 Erlangen, Germany
Donat P. Häder
Affiliation:
Department Biology, Cell Biology Division, University of Erlangen-Nuremberg, Staudtstrasse 5, 91058 Erlangen, Germany
Jürgen Schneider
Affiliation:
Materials Research Center, University of Freiburg, 79104 Freiburg, Germany
Lothar Wondraczek
Affiliation:
Institute of Glass and Ceramics (WW3), University of Erlangen-Nuremberg, Martensstr. 5, 91058 Erlangen, Germany
Albrecht Winnacker
Affiliation:
Chair WW6 Materials for Electronics and Energy Technology (i-MEET), University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
Christoph J. Brabec
Affiliation:
Chair WW6 Materials for Electronics and Energy Technology (i-MEET), University of Erlangen-Nuremberg, Martensstr. 7, 91058 Erlangen, Germany
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Abstract

A series of Ca1-xSrxS:Eu2+y mol% phosphors were synthesized with solid state reactions and with various Ca/Sr ratio and Eu2+ doping concentrations. The influences of the lattice composition and the Eu2+ doping level on photoluminescent properties were analyzed. With doping concentrations between 0.1 to 3 mol%, concentration quenching takes place leading to the decrease of luminance; the emission maxima are also red-shifted. Further, this work reports enhanced photosynthetic activities of intact spinach leaves due to spectral modification of simulated solar irradiation by one synthesized phosphor (Ca0.4Sr0.6S:Eu1 mol%). The CO2 assimilation rates of intact spinach leaves were monitored with an effective homemade photosynthesis measurement system with controlled light conditions. The phosphor could efficiently convert the photosynthetically less active green part of the solar spectrum into the red, with a broad-band red emission centered at 650 nm and a halfband-width of 68 nm, giving an excellent match with the absorption spectrum of spinach chloroplasts. By careful referencing the photon flux, we found an enhanced photosynthetic activities by about 30 % due to the emission of the phosphor.

Keywords

Euluminescencephotochemical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1342: Symposium V – Rare-Earth Doping of Advanced Materials for Photonic Applications , 2011 , mrss11-1342-v04-04
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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