Luminescence of alternating SiO2:Tb and SiO2:Ce thin films produced by sol-gel spin coating

被引：2

作者：

Ahmed, H. A. A. Seed ^{[1
,2
]}

Yousif, A. ^{[1
,2
]}

Swart, H. C. ^{[1
]}

Kroon, R. E. ^{[1
]}

机构：

[1] Univ Orange Free State, Dept Phys, ZA-9300 Bloemfontein, South Africa

[2] Univ Khartoum, Dept Phys, Khartoum, Sudan

来源：

MATERIALS TODAY-PROCEEDINGS | 2015年 / 2卷 / 07期

关键词：

Luminescence; Thin films; Sol-gel; Spin coating; SiO2; Tb; Ce; ENERGY-TRANSFER; HIGH-EFFICIENCY; PHOSPHORS; GLASSES;

D O I：

10.1016/j.matpr.2015.08.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin films of different numbers of SiO2:Tb layers as well as alternating layers of SiO2:Tb and SiO2:Ce were fabricated by the sol-gel spin coating method in order to study the effect of Ce3+ on the Tb3+ emission. The prepared films were annealed at 1000 degrees C in a H-2/Ar reducing atmosphere to prevent the occurrence of the tetravalent state of the Ce ions. The topography of the films was investigated by atomic force microscopy and small empty areas were detected which were confirmed by scanning electron microscopy. The luminescence intensity from Tb3+ was found to increase monotonically with the number of deposited layers up to sixteen layers. In the films consisting of alternating layers the Tb3+ ions could be excited through Ce3+ absorption as a result of energy transfer from Ce3+ to Tb3+ ions. When exciting the Tb3+ ions via the Ce3+ ion absorption wavelength of 320 nm, the green emission at 545 nm reached a maximum intensity for four double-layers and then decreased if more layers were added. 3D images obtained by time-of-flight secondary ion mass spectroscopy showed the influence of the heating process on the layers of the thin films. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：4111 / 4117

页数：7

共 18 条

[1] High efficiency energy transfer in Ce,Tb co-doped silica prepared by sol-gel method [J].

Ahmed, H. A. A. Seed ;

Ntwaeaborwa, O. M. ;

Kroon, R. E. .

JOURNAL OF LUMINESCENCE, 2013, 135 :15-19

[2] 5D3 → 7FJ emission of Tb doped sol-gel silica [J].

Ahmed, H. A. A. Seed ;

Ntwaeaborwa, O. M. ;

Gusowski, M. A. ;

Botha, J. R. ;

Kroon, R. E. .

PHYSICA B-CONDENSED MATTER, 2012, 407 (10) :1653-1655

[3] Optical spectroscopy of zinc metaphosphate glasses activated by Ce3+ and Tb3+ ions [J].

Caldino, U. ;

Speghini, A. ;

Bettinelli, M. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2006, 18 (13) :3499-3508

[4] Spectroscopic characterization and optical waveguide fabrication in Ce3+, Tb3+ and Ce3+/Tb3+ doped zinc-sodium-aluminosilicate glasses [J].

Caldino, U. ;

Speghini, A. ;

Alvarez, E. ;

Berneschi, S. ;

Bettinelli, M. ;

Brenci, M. ;

Righini, G. C. .

OPTICAL MATERIALS, 2011, 33 (12) :1892-1897

[5] Effect of reducing sintering atmosphere on Ce-doped sol-gel silica glasses [J].

Fasoli, M. ;

Vedda, A. ;

Lauria, A. ;

Moretti, F. ;

Rizzelli, E. ;

Chiodini, N. ;

Meinardi, F. ;

Nikl, M. .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2009, 355 (18-21) :1140-1144

[6] High efficiency green-luminescent LaPO4:Ce,Tb hierarchical nanostructures:: Synthesis, characterization, and luminescence properties [J].

Fu, Zhenxiao ;

Bu, Wenbo .

SOLID STATE SCIENCES, 2008, 10 (08) :1062-1067

[7] Impact of capillarity forces on the steady-state self-organization in the thin chromium film on glass under laser irradiation [J].

Gedvilas, Mindaugas ;

Voisiat, Bogdan ;

Regelskis, Kestutis ;

Raciukaitis, Gediminas .

THIN SOLID FILMS, 2014, 571 :102-107

[8]

Guodong Q., 1997, J LUMIN, V75, P63

[9]

Kroon R.E., 2011, P SAIP2011 56 ANN C, P162

[10] Silica gel glasses with a high efficiency of luminescence sensitization in the Ce3+-Tb3+ system [J].

Malashkevich, GE ;

Semkova, GI ;

Stupak, AP ;

Sukhodolov, AV .

PHYSICS OF THE SOLID STATE, 2004, 46 (08) :1425-1431

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