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基于NaYF4 : Yb3+ , Er3+ 上转换发光材料的色彩设计
Color Design Based on Upconversion Luminescence of NaYF4 : Yb3+, Er3+
- 发光学报 2010年31卷第1期 页码：69-74
- 作者机构：
1. 中国科学技术大学 少年班学院, 安徽 合肥 230026
2. 中国科学技术大学物理系, 安徽 合肥 230026
3. 中国科学技术大学 物理实验教学中心, 安徽 合肥 230026
- 作者简介：
- 基金信息：
DOI：
中图分类号： O482.31纸质出版日期：2010-2-20，
网络出版日期：2010-2-20，
收稿日期：2009-7-28，
修回日期：1900-1-2，
扫 描 看 全 文
任 琪, 代如成, 沈宇华, 等. 基于NaYF4 : Yb3+ , Er3+ 上转换发光材料的色彩设计[J]. 发光学报, 2010,31(1):69-74.
REN Qi, DAI Ru-cheng, SHEN Yu-hua, et al. Color Design Based on Upconversion Luminescence of NaYF4 : Yb3+, Er3+[J]. Chinese Journal of Luminescence, 2010,31(1):69-74.
摘要
采用共沉淀法制备β-NaYF
4
: Yb
3+
Er
3+
。X射线衍射图谱结果表明退火有利于β相生长。样品在970 nm处有一强烈吸收峰
利用980 nm激光激发样品
实现红、绿、蓝三色上转换发光;其中蓝光相对较弱
红、绿光的发射峰分别为521
539
659 nm。速率方程表明红、绿发射对应跃迁均是双光子过程
实验结果与理论分析相符。此外
对红、绿发射带面积比的研究表明激发功率和Yb
3+
掺杂量影响发光颜色;进而可实现简便的色彩设计。
Abstract
Upconversion luminescence is one of the most efficient progress for the generation of visible radiation by near-infrared (NIR) excitation. A lot of studying works indicated
that
under 980 nm excitation
Yb
3+
/Er
3+
and Yb
3+
/Tm
3+
co-doped NaYF
4
materials are well-known because of the highest upconversion efficiency so far. Due to the feature of NIR excitation
frequency upconversion materials would have wide and potential application in light emitting displays
multiplexed biological labeling
short-wavelength lasers and so on. In general
the manipulating color is implemented by changing the intensities of red
green and blue
respectively. The method is complex and expensive. For frequency upconversion red
green and blue lights can be emitted at same time by only one pump NIR laser and the proportions of red/green and red/blue are variable with the pump power. So
the simple color design can be obtained based on the upconversion luminescence. This paper specially discussed a feasible approach to modulate the output color based on the upconversion materials. In this paper the upconversion phosphors NaYF
4
: Yb
3+
Er
3+
were prepared by co-precipitation progress. XRD patterns of the samples showed that the annealing process at 400~600 ℃ induced transformation from the cubic to the hexagonal phase that benefits the upconversion emission. A strong absorption peak near 970 nm was observed
which is due to the transition from ground state
2
F
2/7
to excited state
2
F
2/5
of Yb
3+
. Upconversion luminescence of red
green and blue was obtained under the excitation of 980 nm diode in NaYF
4
∶ Yb
3+
Er
3+
. However
the blue light is too weak to observe. Green and red emissions centered at 521
539 and 659 nm
correspond to the transitions
2
H
11/2
→
4
I
15/2
4
S
3/2
→
4
I
15/2
and
4
F
9/2
→
4
I
15/2
of Er
3+
respectively. The rate equation was built for this upconversion system. From the rate equations the two photons process is obtained for the green and red luminescence under low pump power. The experimental slope agrees with the results from the rate equations. A liner relationship between the pump power and the equivalent wavelength was obtained. The luminescent color can be continuously modulated in a broad wavelength region by changing the pump power. The equivalent wavelength region is also variable with the dopant concentration of Yb
3+
. In this work
the range is near 40 nm from 588 nm to 624 nm for 10%Yb
3+
. When dopant concentration of Yb
3+
increases
the wavelength region shifts to blue. This study offers an approach for quantitatively modulating the emission color. This method is simple and easy to operate. It has a potential industrial application in light-emitting displays
anti-counterfeiting techniques
and so on.
关键词
上转换Er3+/Yb3+ 共掺杂色彩设计
Keywords
upconversionYb3+/Er3+ co-doppingemission color modulation
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