Quantum efficiency of silica-coated rare-earth doped yttrium silicate

被引：26

作者：

Cervantes-Vasquez, D. ^{[1
]}

Contreras, O. E. ^{[2
]}

Hirata, G. A. ^{[2
]}

机构：

[1] Ctr Invest Cient & Educ Super Ensenada, Ensenada 22860, BC, Mexico

[2] Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Ensenada 22800, BC, Mexico

来源：

JOURNAL OF LUMINESCENCE | 2013年 / 143卷

关键词：

Colloidal silica; Yttrium silicate; White light emitting; Quantum efficiency; WHITE-LIGHT EMISSION; LUMINESCENCE; PHOSPHOR; POWDERS;

D O I：

10.1016/j.jlumin.2013.05.006

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The photoluminescent properties of rare earth-activated white-emitting Y2SiO5:Ce,Tb nanocrystalline phosphor prepared by two different methods, pressure-assisted combustion synthesis and sol-gel, were studied. The synthesized phosphor samples were post-annealed at 1373 K and 1623 K in order to obtain the X1-Y2SiO5 and X2-Y2SiO5 phases, respectively, which were confirmed by X-ray diffraction measurements. Photoluminescence analysis showed the contribution of two blue-emission bands within the 380-450 nm region originating from 5d-4f transitions in Ce3+ ions and a well-defined green emission of Tb3+ ions located at 545 nm corresponding to D-5(4)-> F-7(5) electronic transitions. Thereafter, Y2SiO5:Ce,Tb powders were coated with colloidal silica in order to investigate the effect of silica coatings on their luminescent properties. Absolute fluorescence quantum efficiency measurements were carefully performed, which revealed an increase of 12% of efficiency in coated compared with bare-Y2SiO5:Ce,Tb phosphor. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：226 / 232

页数：7

共 26 条

[1] High-temperature-stable catalysts by hollow sphere encapsulation [J].

Arnal, Pablo M. ;

Comotti, Massimiliano ;

Schueth, Ferdi .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2006, 45 (48) :8224-8227

[2] Display applications of rare-earth-doped materials [J].

Ballato, J ;

Lewis, JS ;

Holloway, P .

MRS BULLETIN, 1999, 24 (09) :51-56

[3]

Blasse G., LUMINESCENT MAT, P26

[4]

Bosze EJ, 2007, J AM CERAM SOC, V90, P2484, DOI [10.1111/j.1551-2916.2007.01809.x, 10.1111/j.1551.2916.2007.01809.x]

[5] Luminescence and decay behaviors of Tb-doped yttrium silicate [J].

Choi, YY ;

Sohn, KS ;

Park, HD ;

Choi, SY .

JOURNAL OF MATERIALS RESEARCH, 2001, 16 (03) :881-889

[6] New combustion synthesis technique for the production of (InxGa1-x)2O3 powders:: Hydrazine/metal nitrate method [J].

García, R ;

Hirata, GA ;

McKittrick, J .

JOURNAL OF MATERIALS RESEARCH, 2001, 16 (04) :1059-1065

[7] Preparation and photoluminescence properties of Y2SiO5: Eu3+ nanocrystals [J].

Ghosh, Pushpal ;

Sadhu, Suparna ;

Patra, Amitava .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2006, 8 (28) :3342-3348

[8] Energy transfer study between Ce3+ and Tb3+ ions in doped and core-shell sodium yttrium fluoride nanocrystals [J].

Ghosh, Pushpal ;

Kar, Arik ;

Patra, Amitava .

NANOSCALE, 2010, 2 (07) :1196-1202

[9] White light emission from rare earth activated yttrium silicate nanocrystalline powders and thin films [J].

Gonzalez-Ortega, JA ;

Tejeda, EM ;

Perea, N ;

Hirata, GA ;

Bosze, EJ ;

McKittrick, J .

OPTICAL MATERIALS, 2005, 27 (07) :1221-1227

[10] Luminescence enhancement of Y2O3:Eu3+ and Y2SiO5:Ce3+,Tb3+ core particles with SiO2 shells [J].

Han, J. K. ;

Hirata, G. A. ;

Talbot, J. B. ;

McKittrick, J. .

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 2011, 176 (05) :436-441

← 1 2 3 →