The influence of defects formed by Ca excess and thermal post-treatments on the persistent luminescence of CaTiO3:Pr

被引：14

作者：

Otal, Eugenio H. ^{[1
]}

Maegli, Alexandra E. ^{[1
]}

Vogel-Schaeuble, Nina ^{[1
]}

Walfort, Bernhard ^{[2
]}

Hagemann, Hans ^{[3
]}

Yoon, Songhak ^{[1
]}

Zeller, Albert ^{[2
]}

Weidenkaff, Anke ^{[1
]}

机构：

[1] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Solid State Chem & Catalysis, CH-8600 Dubendorf, Switzerland

[2] LumiNova AG, CH-9053 Teufen, Switzerland

[3] Univ Geneva, Dept Chim Phys, CH-1211 Geneva 4, Switzerland

来源：

OPTICAL MATERIALS EXPRESS | 2012年 / 2卷 / 04期

关键词：

RED; AFTERGLOW; PHOTOLUMINESCENCE; ENHANCEMENT; CATIO3-PR3+; PHOSPHORS; SR3TI2O7; PR;

D O I：

10.1364/OME.2.000405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Red emitting CaTiO3:Pr phosphors with a nominal composition of Ca0.998+xPr0.002TiO3+delta (0.02 <= x <= 0.04) were prepared by solid state reactions with different thermal post treatments and characterized by X-ray diffraction, transmission electron microscopy and photoluminescence. The Ca excess exhibited complete solubility up to 4% in the samples treated at 1400 degrees C but segregation in the form of Ruddlesden-Popper phases (Ca3Ti2O7 - Ca4Ti3O10) was observed in samples prepared at 1500 degrees C. The increase in temperature for stoichiometric samples showed a monotonic increase of decay time due to the reduction of non-radiative recombination defects. It was found that the Ca excess favored the formation of oxygen vacancies which are known to act as trap. In the samples treated at 1400 degrees C, 3% of Ca excess showed to be the best concentration to increase the decay time of persistent luminescence. For the samples treated at 1500 degrees C, the segregation of Ruddlesden-Popper phases left a constant amount of Ca soluble in all the CaTiO3 samples. This constant concentration of Ca caused the same density of defects and, consequently, the same decay time in all samples. (C) 2012 Optical Society of America

引用

页码：405 / 412

页数：8

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