Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Hydrothermal Synthesis of SrMgZnSi 2 O 7 :Eu 3+ Phos phor
Nevzat Külcü 1 * , Fatih Mehmet Emen 2 , 1 , Sevda Sönmez 1 , Aynur Gürbüz 1 and Tülay Çetin 1
1 Department of Chemistry, Mersin University, Mersin,33342, Turkey
2 Department of Chemistry, Kirklareli University, Kirklareli,39300, Turkey
Abstract-SrM gZnSi 2 O 7 :Eu 3+ nanophosphor was prepared under hydrothermal conditions at 200 o C and 6h. The luminescence properties were
investigated and lifetime calculations were carried out. It is determaned that the red emission is caused by the band at 615 nm.
Nanophosphors have been extensively investigated during
the last decade due to their application potential for various
high-performance and novel displays and devices. Synthesis
of nanophosphors is generally done by different routes such as
colloidal, capping, cluster formation, sol-gel, electrochemical
etc., are being followed. Chemical precipitation in presence of
capping agents, reaction in microemulsions, sol-gel reaction
and autocombustion are commonly used techniques for
synthesis of nanophosphors.
Recently, alkaline earth silicates doped with rare earth ions
have attracted research interests in the field of
photoluminescence since they are suitable hosts with high
chemical stability. The phosphors with an akermanite-type
structure are the host structures that have been researched
intensively [1–3]. Eu 2+ , Dy 3+ co-doped Sr 2 MgSi 2 O 7 phosphor
was found to emit a blue–green light peaking at 476 nm upon
UV illumination and show a long afterglow [1]. Toda et al.
have been prepared Sr2MgSi2O7:Eu 2+ ,Dy 3+ and
Ca2MgSi2O7:Eu 2+ , Dy 3+ phosphors, and they show a bright and
long-lasting phosphorescence [2].
In this work, we synthesized SrMgZnSi 2 O 7 :Eu 3+ phosphor
by hydrothermal method. Sr(NO 3 ) 2 , Mg(NO 3 ) 2 , Zn(NO 3 ) 2
and TEOS solution mixture were reacted at 220 o C and 3 days
in high pressure hydrothermal unit. The white solids was
filtered and washed with water and dried. Then dried solids
heated at 800 o C and 6 h. Excitation and emission lifetime
properties were studied by photoluminescence spectra.
band is broad and belongs typically to the 5 D 0 7 F j (j=0-4)
electronic transition of Eu 3+ ions. 3+
ions reside in a position which has a low local symmetry.
Then the luminescence lifetime of phosphor were
calculated by using the following equation.
I = A e (-t/ )
Where, I: Intensity; : lu minescence lifetime; A:constant.
As a result the luminescence lifetime is found as 1.765 ms.
In summary, a new red SrMgZnSi 2 O 7 :Eu 3+ phosphor has
been successfully synthesized by hydrothermal method.
Phosphor has four emission bands between 590-700 nm. The
lifetime of the trap was calculated to be 1.765 ms. This red
emission phosphor may be used in display panels and
fluorescence lamp phosphors The particle size distribution
and surface morphology analysis will be studied by SEM
technique.
This work was partially supported by TUBITAK under
Grant No. TBA G-107T392.
*Corresponding author: nkulcu@yahoo.com
[1] Y. Lin, Z. Tang, Z. Zhang, X. Wang, J. Zhang, J. Mater. Sci. Lett.
20 1505, (2001).
[2] K. Toda, Y. Imanari, T. Nonogawa, J. Miyoshi, K. Uematsu, M.
Sato, J. Ceram. Soc. Jpn. 110 (4), 283, (2002).
[3] L. Jiang, C. Chang, D. Mao, J. Alloys Compd. 360 (1–2) 193,
(2003).
Figure 1. Excitation and Emission spectra of SrMgZnSi 2 O 7 :Eu 3+
phosphorus
We investigated photoluminescence spectra of
SrMgZnSi 2 O 7 :Eu 3+ phosphor as detailed its excitation and
emission spectra are shown in the figure. In the excitation
spectrum, three absorption bands have been observed. While
the broad absorption band is attributed to Eu-O chargetransition
and the other two weak band that observed at 308
and 389 nm are attributed to 4f electronic transition of
Eu 3+ ions. In the emission spectrum were observed four
emission bands which observed at 590 nm, 615 nm, 651 nm
and 700 nm, but the band at 615 nm cause a red emission. This
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