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Technical Brief

Solar Radiation Conversion With Mesoporous Silica Activated by Rare-Earth Ions

[+] Author and Article Information
T. N. Nurakhmetov

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: Nurakhmetov_tn@enu.kz

K. A. Kuterbekov

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: kkuterbekov@gmail.com

D. H. Daurenbekov

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: duke.ddx@yandex.ru

A. Zh. Zhanbotin

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: g.armani@mail.ru

A. A. Betekbaev

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: abetekbaev@kazatomprom.kz

A. Z. Kainarbay

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazahstan
e-mail: aset_mirabilicus@mail.ru

T. A. Schmedake

Department of Chemistry,
University of North Carolina—Charlotte,
Charlotte, NC 28223
e-mail: tschmeda@uncc.edu

M. K. Kuterbekov

Department of Technical Physics,
L. N. Gumilyov Eurasian National University,
Astana 010000, Kazakhstan
e-mail: Mirasbek.kuterbekov@gmail.com

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received September 22, 2014; final manuscript received June 18, 2015; published online September 2, 2015. Editor: Robert F. Boehm.

J. Sol. Energy Eng 137(6), 064502 (Sep 02, 2015) (4 pages) Paper No: SOL-14-1275; doi: 10.1115/1.4031212 History: Received September 22, 2014; Revised June 18, 2015

Intrinsic and extrinsic nature of the luminescence of pure and Eu3+ and Tb3+ rare-earth ions activated mesoporous silica has been investigated by spectroscopic methods. Increasing the Eu3+ impurity concentration from 0.01 mg to 7 mg, results in an increase of the impurity particles radiation in the luminescent mesoporous colloidal silica (LMCS) matrix by several times. With an increase in the concentration of Tb3+ from 0.01 mg to 3 mg, impurity luminescence intensity increases several times while the intrinsic luminescence intensity maximum at 400 and 460 nm is decreasing. Based on the experimental evidence, it is suggested that the energy of the own electronic matrix excitation is transferred by emitters, i.e., impurities of Eu3+ and Tb3+ ions. Also, it is assumed that the emission band at 610 nm in an LMCS—Eu3+ and emission band at 543 nm in the LMCS—Tb3+ is attributed to the intracenter transitions within the Eu3+ and Tb3+ ions.

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References

Figures

Grahic Jump Location
Fig. 1

LMCS particles growth scheme

Grahic Jump Location
Fig. 2

(a) Excitation spectrum emission at 414 nm (1), excitation spectrum emission at 438 nm (2); (b) the emission spectrum of the sample with irradiated excitation by light with wavelength of 314 nm (1), emission spectrum with excitation by light with wavelength of 360 nm (2), and emission spectrum with excitation by light with wavelength of 378 nm (3)

Grahic Jump Location
Fig. 3

The emission spectrum of pure LMCS particles (curve 1). The emission spectrum of LMCS particles with Eu3+ impurity in a concentration of 0.01 mg–7 mg (curves 2–9).

Grahic Jump Location
Fig. 4

The emission spectrum of pure LMCS particles (curve 1), the spectrum of radiation of LMCS with Tb3+ impurity with the concentration in the range of 0.1 mg–3 mg (curves 2–4)

Grahic Jump Location
Fig. 5

The excitation spectrum of LMCS particles with Eu3+ impurity for the emission band of 610 nm annealed for 6 hrs (curve 1) and annealed for 48 hrs (curve 2), the excitation spectrum of the pure LMCS particle for emission band of 438 nm (curve 3) and for emission bands 414 nm (curve 4)

Grahic Jump Location
Fig. 6

LMCS particle excitation spectrum with the Tb3+ impurity for the emission band of 543 nm annealed for 6 hrs (curve 1) and for 48 hrs (curve 2), the excitation spectrum of the pure LMCS particle emission band of 400 nm (curve 3)

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