Effect of Urea&rsquo;s Quantity on the Afterglow Characteristic of CaAl2O4：Eu2+,Nd3+ Phosphor Prepared by Combustion Synthesis

YANG Zhi-ping; YANG Yong; LI Xing-min; LI Xu; LI Pan-lai

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Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl₂O₄：Eu²⁺,Nd³⁺ Phosphor Prepared by Combustion Synthesis

更新时间：2020-08-11

- Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl₂O₄：Eu²⁺,Nd³⁺ Phosphor Prepared by Combustion Synthesis
- Chinese Journal of Luminescence Vol. 27, Issue 2, Pages: 159-163(2006)
- 作者机构：
  
  1. 河北大学, 物理科学与技术学院,河北保定,071002
  2. 河北大学, 电子信息工程学院,河北保定,071002
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：25 August 2004，
  
  Revised：21 March 2005，
  
  Published：20 March 2006
- 稿件说明：
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杨志平, 杨勇, 李兴民, 李旭, 李盼来. 尿素用量对燃烧法合成CaAl2O4：Eu2+,Nd3+长余辉材料发光性能的影响[J]. 发光学报, 2006,27(2): 159-163

YANG Zhi-ping, YANG Yong, LI Xing-min, LI Xu, LI Pan-lai. Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl2O4：Eu2+,Nd3+ Phosphor Prepared by Combustion Synthesis[J]. Chinese Journal of Luminescence, 2006,27(2): 159-163
杨志平, 杨勇, 李兴民, 李旭, 李盼来. 尿素用量对燃烧法合成CaAl2O4：Eu2+,Nd3+长余辉材料发光性能的影响[J]. 发光学报, 2006,27(2): 159-163 DOI：

YANG Zhi-ping, YANG Yong, LI Xing-min, LI Xu, LI Pan-lai. Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl2O4：Eu2+,Nd3+ Phosphor Prepared by Combustion Synthesis[J]. Chinese Journal of Luminescence, 2006,27(2): 159-163 DOI：

摘要

利用金属硝酸盐和尿素的氧化还原反应

通过燃烧法在600℃的炉温下合成了蓝紫色长余辉发光材料CaAl

:Eu

。在金属硝酸盐溶液浓度不变的条件下

通过改变尿素与硝酸根的量的比

合成了多组长余辉材料样品。当尿素用量较少时

不能完全被还原为Eu

;随尿素用量增加

样品的Eu

特征发射减弱

余辉初始亮度和持续时间均得到改善;当尿素的用量达到理论用量的5倍时

样品余辉特性最好

继续增加尿素用量

余辉亮度和持续时间反而下降。将燃烧法制备的各组样品用活性炭密封

在1000℃条件下反应2h

使Eu

完全被还原为Eu

同时除去燃烧法反应不完全的杂质

可以一定程度提高材料的余辉发光性能。

Abstract

The afterglow phosphor CaAl

:Eu

is prepared utilizing the redox reaction of respective metal nitrates and urea by combustion synthesis with ignition temperatures of 600℃.The X-ray diffraction(analysis) showed that it is coincident with the JCPDS Card(No.23-1036) and its crystal structure is CaAl

which belongs to monoclinic phase and the crystal lattice constant is as follows:

=0.8698 nm

=0.8092 nm

=1.5208 nm.With the invariable concentration of metallic ions nitrate

a series of phosphor samples were synthesized by altering the ratio of urea and nitrate.The emission spectra and excitation spectra of the phosphor were investigated.The excitation spectra of CaAl

:Eu

showed a double peak broadband structure.The main peak located at 352 nm and a shoulder peak at 266 nm.The quantity of urea has obvious influence on the emission spectrum of CaAl

:Eu

.When the quantity of urea exceed double of theoretic quantity

adequate reducing gas produced in the process of combustion reaction benefit to the form of Eu

luminescent center

so emission spectra of CaAl

:Eu

consist of characteristic broad band emission of Eu

.Contrast this

inadequate reducing gas benefit to form of Eu

luminescent center

so when the quantity of urea less than double of theoretic quantity

the emission spectra exhibit characteristic narrowband emission of Eu

.The samples are fired at 1000℃ for 2h in an active carbon atmosphere in order to deoxidize residual Eu

to Eu

and eliminate impurity brought by combustion synthesis.This is beneficial to promote the performance of luminescence.The decay curves of phosphor with different quantity of urea were measured.The change of ureas quantity affected on the afterglow character of CaAl

:Eu

distinctly and the optimal quantity of urea is 5 times of theoretic quantity.When more urea was used in the experiment

the luminescent intensity will decrease and the lasting time will be shorten.

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Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl2O4：Eu2+,Nd3+ Phosphor Prepared by Combustion Synthesis

DOI：

摘要

Abstract

关键词

Keywords

references

Effect of Urea’s Quantity on the Afterglow Characteristic of CaAl₂O₄：Eu²⁺,Nd³⁺ Phosphor Prepared by Combustion Synthesis