共沉淀法制备NaYF4 : Tm3+,Yb3+的上转换发光

孙家跃; 杨志萍; 杜海燕

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共沉淀法制备NaYF₄ : Tm³⁺,Yb³⁺的上转换发光

论文 | 更新时间：2020-08-12

- 共沉淀法制备NaYF₄ : Tm³⁺,Yb³⁺的上转换发光
- Upconversion Luminescence Properties of NaYF₄ : Tm³⁺,Yb³⁺Synthesized by Co-precipitation Method
- 发光学报 2009年30卷第2期页码：195-200
- 作者机构：
  
  北京工商大学化工学院北京,100037
- 作者简介：
- 基金信息：
- DOI：
  中图分类号： O482.31
- 收稿日期：2008-08-25，
  
  修回日期：1900-01-02，
  
  网络出版日期：2009-04-30，
  
  纸质出版日期：2009-04-30
- 稿件说明：
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孙家跃, 杨志萍, 杜海燕. 共沉淀法制备NaYF₄ : Tm³⁺,Yb³⁺的上转换发光[J]. 发光学报, 2009,30(2):195-200.

SUN Jia-yue, YANG Zhi-ping, DU Hai-yan. Upconversion Luminescence Properties of NaYF₄ : Tm³⁺,Yb³⁺Synthesized by Co-precipitation Method[J]. Chinese journal of luminescence, 2009, 30(2): 195-200.
孙家跃, 杨志萍, 杜海燕. 共沉淀法制备NaYF₄ : Tm³⁺,Yb³⁺的上转换发光[J]. 发光学报, 2009,30(2):195-200. DOI：

SUN Jia-yue, YANG Zhi-ping, DU Hai-yan. Upconversion Luminescence Properties of NaYF₄ : Tm³⁺,Yb³⁺Synthesized by Co-precipitation Method[J]. Chinese journal of luminescence, 2009, 30(2): 195-200. DOI：

摘要

通过共沉淀法制备Tm

和Yb

掺杂的NaYF

上转换发光材料。其中Tm

和Yb

的摩尔分数分别为0.01%

0.1%。在室温下测试了NaYF

: Tm

材料在300~1 100 nm的吸收光谱。利用X射线衍射(XRD)

扫描电镜(SEM)测试了合成材料的物相结构和微观形貌。结果表明:NaYF

: Tm

材料为六方相晶体

其颗粒大小约为50~60 nm

产物结晶良好

含有少量杂相。在798 nm近红外光激发下

测试了样品的上转换发光光谱。观察到了蓝、绿色上转换发光。讨论了上转换发光的可能机理

蓝光主要来源于Tm

的激发态

到基态

的跃迁

绿光来源于Tm

的

→

跃迁。

Abstract

The upconversion (UC) processes of infrared light to visible light of rare earth ions doped different hosts have been investigated extensively

due to their potential applications in some fields

such as solid-state lasers

display

communications

and so on. The recent researches emerging at the intersection of nanotech-nology and biotechnology are opening up a new period for the development of UC. As known

the controlled fabrication of a host with aimed structure is important for enhancing the upconversion efficiency

because the phonon energy of the host can affect the probabilities of non-radiative decay and the energy transfer. Therefore

it is necessary to choose a lattice with much lower phonon energy

which is benefit to the upconversion luminescence. Rare earth-doped hexagonal sodium yttrium fluoride (NaYF4) is a good host

which is known to be a very efficient near-infrared to visible upconverter. The hexagonal NaYF4 has low phonon energy. The structure of hexagonal phase gives rise to controversy about the cation sites and distribution. The trivalent thulium (Tm3+) is an ideal candidate for single wavelength NIR upconversion due to its ladder of nearly equally spaced energy levels that are multiples of the 1G4→3H6 transition. The development of compact blue lasers based on Tm3+ upconversion processes is nowadays widely studied mainly due to the potential of high perfor-mance OEM applications

such as biomedical and analytical instrumentation

display

photoprinting. In thu-lium doped media

the efficiency of this process is very low

but it was noticed that the mechanism could be made one or two orders of magnitude more efficient by using ytterbium(Yb3+). In this paper

trivalent thu-lium (Tm3+) and yttebium (Yb3+) ions codoped NaYF4 were synthesized by co-precipitation method. The concentration of Tm3+ and Yb3+ are 0.01%

0.1%

respectively. The absorption spectrum of NaYF4∶Tm3+

Yb3+ from 300 to 1 100 nm was measured at room temperature. The upconversion emission was observed when excited by 798 nm. The green and blue upconversion emission spectra were measured. Based on the experimental results the possible upconversion mechanism was analyzed. The main mechanism is the in-direct sensitization of Tm3+ and Yb3+. The blue emitting light results from the transition of 1G4→3H6 of Tm3+

green emitting light is from the transition of 1D2 →3F4 of Tm3+. To our knowledge

there have not been similar works published domestically and abroad. The structural properties of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that NaYF4∶Tm3+

Yb3+ prepared by co-precipitation method exhibits hexagonal crystal phase.

关键词

Keywords

references

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