The influence of Nd3+ in CaAl2O4:Eu2+,Nd3+ phosphor fabricated by combustion synthesis

Zhiping Yang; Yong Yang; Xingmin Li; Xu Li; Chong Liu; Jianwei Feng

doi:10.1117/12.575871

12 January 2005 The influence of Nd³⁺ in CaAl₂O₄:Eu²⁺,Nd³⁺ phosphor fabricated by combustion synthesis

Zhiping Yang, Yong Yang, Xingmin Li, Xu Li, Chong Liu, Jianwei Feng

Proceedings Volume 5632, Light-Emitting Diode Materials and Devices; (2005) https://doi.org/10.1117/12.575871
Event: Photonics Asia, 2004, Beijing, China

Abstract

Eu²⁺, Nd³⁺ co-doped calcium aluminate (CaAl₂O₄) phosphor with high brightness and long afterglow were fabricated by urea-nitrate solution combustion synthesis at 600°C. The phosphor powder of combustion synthesis were generally more homogeneous and had fewer impurity than phosphor fabricated by conventional solid-state methods, the character could conduce to obtain more exact data. The excitation and emission spectrum indicated that there waxs only one luminescence center Eu²⁺, both of the characteristic spectrums of Eu³⁺ and Nd³⁺ weren't discovered. As a secondary activator, Nd³⁺ could make remarkable influence on the afterglow of phosphor. From altering the moral ratio of Eu²⁺ and Nd³⁺, the lasting time of afterglow and thermoluminescence were studied respectively, when Nd³⁺ wasn't appended, the intensity of initial brightness could compared with other materials which had different ratio of Eu²⁺ and Nd³⁺, however the brightness of afterglow decayed rapidly, the lasting time and brightness of afterglow were improved with reduce the radio of Eu²⁺ and Nd³⁺, while the ratio achieved some value, the lasting time of afterglow become shorten with the reduce of ratio of Eu²⁺ and Nd³⁺. Moreover the depth of trap was calculated from the parameter of thermoluminescence. However, the emission spectrum and XRD patterns didn't change obviously with the altering ratio of Eu²⁺ and Nd³⁺. It showed that the little amount of doped rear earth ions (Eu²⁺ and Nd³⁺) had almost no effect on the CaAl₂O₄ phase composition. Based on these conclusions, the model of the luminescence process of CaAl₂O₄:Eu²⁺, Nd³⁺ was built.

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Zhiping Yang, Yong Yang, Xingmin Li, Xu Li, Chong Liu, and Jianwei Feng "The influence of Nd³⁺ in CaAl₂O₄:Eu²⁺,Nd³⁺ phosphor fabricated by combustion synthesis", Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); https://doi.org/10.1117/12.575871

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KEYWORDS

Combustion

Europium

Neodymium

Ions

Luminescence

Solid state physics

Crystals

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