Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er<sup>3+</sup>–Yb<sup>3+</sup> system

Jiahua Zhang; Zhendong Hao; Jing Li; Xia Zhang; Yongshi Luo; Guohui Pan

doi:10.1038/lsa.2015.12

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Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er³⁺–Yb³⁺ system

Original Articles

- Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er³⁺–Yb³⁺ system
- Light: Science & Applications Vol. 4, Issue 1, (2015)
- Affiliations：
  
  State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China
- Author bio：
  
  Professor JH Zhang, State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy ofSciences, 3888 Eastern South Lake Road, Changchun 130033, ChinaE-mail: zhangjh@ciomp.ac.cn
- Funds：
- DOI：10.1038/lsa.2015.12
  CLC：
- Published：2015-03，
  
  Published Online：19 November 2014，
  
  Received：04 August 2014，
  
  Revised：12 November 2014，
  
  Accepted：18 November 2014
- Accepted：
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Zhang, J. H. et al. Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er³⁺–Yb³⁺ system. Light: Science & Applications, 4, e239 (2015).
DOI：

Zhang, J. H. et al. Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er³⁺–Yb³⁺ system. Light: Science & Applications, 4, e239 (2015). DOI： 10.1038/lsa.2015.12.

摘要

Abstract

The rare earth Er

and Yb

codoped system is the most attractive for showcasing energy transfer upconversion. This system can generate green and red emissions from Er

under infrared excitation of the sensitizer Yb

. It is well known that the red-emitting state can be populated from the upper green-emitting state. The contribution of multiphonon relaxation to this population is generally considered important at low excitation densities. Here

we demonstrate for the first time the importance of a previously proposed but neglected mechanism described as a cross relaxation energy transfer from Er

to Yb

followed by an energy back transfer within the same Er

–Yb

pair. A luminescence spectroscopy study of cubic Y

: Er

indicates that this mechanism can be more efficient than multiphonon relaxation

and it can even make a major contribution to the red upconversion. The study also revealed that the energy transfers involved in this mechanism take place only in the nearest Er

–Yb

pairs

and thus

it is fast and efficient at low excitation densities. Our results enable a better understanding of upconversion processes and properties in the Er

–Yb

system.

关键词

Keywords

energy transfererbium–ytterbium systemupconversion luminescence

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⁰

Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er3+–Yb3+ system

DOI：10.1038/lsa.2015.12

摘要

Abstract

关键词

Keywords

references

Observation of efficient population of the red-emitting state from the green state by non-multiphonon relaxation in the Er³⁺–Yb³⁺ system