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Hydrothermal Synthesis of NaYF4∶Er3+ and Its Ultraviolet Up-conversion Light Emitting Property
- Chinese Journal of Luminescence Vol. 33, Issue 2, Pages: 122-127(2012)
- 作者机构：
1. 西北大学 化工学院,陕西 西安,710069
2. 西北大学 物理学系,陕西 西安,710069
- 作者简介：
- 基金信息：
DOI：10.3788/fgxb20123302.0122
CLC： O482.31;O614.33Received：28 November 2011，
Revised：09 December 2011，
Published Online：10 February 2012，
Published：10 February 2012
- 稿件说明：
移动端阅览
何奇, 樊君, 胡晓云, 叶岩溪, 孙涛. NaYF<sub>4</sub>∶Er<sup>3+</sup>的水热合成及其紫外上转换发光性能[J]. 发光学报, 2012,33(2): 122-127
HE Qi, FAN Jun, HU Xiao-yun, YE Yan-xi, SUN Tao. Hydrothermal Synthesis of NaYF<sub>4</sub>∶Er<sup>3+</sup> and Its Ultraviolet Up-conversion Light Emitting Property[J]. Chinese Journal of Luminescence, 2012,33(2): 122-127
何奇, 樊君, 胡晓云, 叶岩溪, 孙涛. NaYF<sub>4</sub>∶Er<sup>3+</sup>的水热合成及其紫外上转换发光性能[J]. 发光学报, 2012,33(2): 122-127 DOI： 10.3788/fgxb20123302.0122.
HE Qi, FAN Jun, HU Xiao-yun, YE Yan-xi, SUN Tao. Hydrothermal Synthesis of NaYF<sub>4</sub>∶Er<sup>3+</sup> and Its Ultraviolet Up-conversion Light Emitting Property[J]. Chinese Journal of Luminescence, 2012,33(2): 122-127 DOI： 10.3788/fgxb20123302.0122.
摘要
采用水热法制备了Er
3+
掺杂的NaYF
4
上转换发光材料
X射线衍射结果表明
当反应温度为180 ℃和200 ℃时
晶体属于六方晶型和四角晶型混合相态;当反应温度为220 ℃时
该晶体属于纯六方晶型结构。SEM和TEM观察发现
晶粒为六角形
样品颗粒分散性好
平均粒径约为100 nm。荧光光谱测试结果表明
当激发波长为500 nm时
样品发射出紫外光。从Er
3+
能级图谱可以得出
Er
3+
基态电子
4
I
15/2
首先跃迁到
2
H
11/2
与
4
S
3/2
能级上
随即经过能量转移上转换过程(ETU)分别发射出310 nm和340 nm的紫外光。结合Er
3+
发光机理可以推出上转换峰310 nm和340 nm均属于双光子过程。 研究结果表明
以NaYF
4
为基质掺杂Er
3+
产生的紫外上转换光在生物成像、光催化发应及生物标记等方面有着广阔的应用前景。
Abstract
Er
3+
doped NaYF
4
up-conversion luminescence material was successfully prepared by hydrothermal method. The X-ray diffraction (XRD) indicates that when the reaction temperature is 180 ℃ or 200 ℃
the crystal structure is a mixture of hexagon and quadrangle
when the reaction temperature is 220 ℃
the crystal shows a hexagon phase structure. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results indicate that the crystal grain has a hexagon structure
and possesses an average size of about 100 nm with a uniform distribution. The fluorescence spectra show that under the exciting wavelength of 500 nm
the sample emits ultraviolet light. It can be concluded from the energy level diagram that the ground state
4
I
15/2
electrons of Er
3+
will first transmit to
2
H
11/2
and
4
S
3/2
levels
and then give out the 310 nm and 340 nm ultraviolet light through the energy transmit up-conversion (ETU) process
respectively. Considering the up-conversion emission mechanism
both the 310 nm and 340 nm up-conversion peaks can be characterized as biphotonic processes. The research results demonstrate that the Er
3+
doped NaYF
4
exhibites an ultraviolet up-conversion light emitting property;and it has a promising way in biomedical imaging
photocatalytic reaction and biomark process
etc.
关键词
Keywords
references
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