Multiphonon Relaxation of 5D3&rarr;5D4 and Local Density of States in &beta;-NaGdF4:Tb3+ Nanocrystals

LIU Chun-xu

doi:10.3788/fgxb20143512.1443

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Multiphonon Relaxation of ⁵D₃→⁵D₄ and Local Density of States in β-NaGdF₄:Tb³⁺ Nanocrystals

更新时间：2020-08-12

- Multiphonon Relaxation of ⁵D₃→⁵D₄ and Local Density of States in β-NaGdF₄:Tb³⁺ Nanocrystals
- Chinese Journal of Luminescence Vol. 35, Issue 12, Pages: 1443-1448(2014)
- 作者机构：
  
  发光学及应用国家重点实验室中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20143512.1443
  CLC： O482.31
- Received：22 August 2014，
  
  Revised：13 September 2014，
  
  Published：03 December 2014
- 稿件说明：
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刘春旭,. 在β-NaGdF4:Tb3+纳米晶中5D3→5D4的多声子弛豫与局域态密度[J]. 发光学报, 2014,35(12): 1443-1448

LIU Chun-xu,. Multiphonon Relaxation of 5D3→5D4 and Local Density of States in β-NaGdF4:Tb3+ Nanocrystals[J]. Chinese Journal of Luminescence, 2014,35(12): 1443-1448
刘春旭,. 在β-NaGdF4:Tb3+纳米晶中5D3→5D4的多声子弛豫与局域态密度[J]. 发光学报, 2014,35(12): 1443-1448 DOI： 10.3788/fgxb20143512.1443.

LIU Chun-xu,. Multiphonon Relaxation of 5D3→5D4 and Local Density of States in β-NaGdF4:Tb3+ Nanocrystals[J]. Chinese Journal of Luminescence, 2014,35(12): 1443-1448 DOI： 10.3788/fgxb20143512.1443.

摘要

实验研究了从体材料到纳米晶(NCs)系统中涉及大能隙(5 800 cm

-1

)的多声子弛豫(MR).在MR非线性理论框架下

用单频近似声子谱分析了-NaGdF

:Tb

NCs中Tb

的MR速率与温度的关系.在12~312 K范围内

实验数据与理论曲线符合得很好.结果表明

MR的产生主要是能量较大的光学声子起作用.在Rayleigh极限下

假设Tb

发射体位于一个纳米球的中心

使用Green张量方法计算了自发衰减速率

rad

.在纳米球内没有发现局域态密度(LDOS)的明显改变.然而

当

35 nm时

在Chew理论的基础上获得在球外LDOS的一个新的高斯分布.

Abstract

This paper reports the experimental study of multiphonon relaxation (MR) involving a large energy gap (5 800 cm

-1

) crossover from bulk to nanocrystal (NC) system. The temperature dependence of MR rate for

of Tb

in -NaGdF

:Tb

NCs was analyzed in a single-frequency approximation of phonon spectrum in the framework of the nonlinear theory of MR. The experimental data well agree with the theoretical curves within the range of 12 K to 312 K. It is shown that MR occurs predominantly

via

high-energy optical phonons. In Rayleigh limit

assuming that the Tb

emitter was located at the center of a nanosphere

the spontaneous decay rate

rad

was calculated using Green tensor approach. No significant variation in the local density of states (LDOS) was found inside the nanospheres. However

for

35 nm

a new Gaussian distribution of LDOS was obtained based on Chew's theory outside the nanospheres.

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references

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⁰

Multiphonon Relaxation of 5D3→5D4 and Local Density of States in β-NaGdF4:Tb3+ Nanocrystals

DOI：10.3788/fgxb20143512.1443

摘要

Abstract

关键词

Keywords

references

Multiphonon Relaxation of ⁵D₃→⁵D₄ and Local Density of States in β-NaGdF₄:Tb³⁺ Nanocrystals