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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
纸质出版日期:2014-12-3,
收稿日期:2014-8-22,
修回日期:2014-9-13,
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刘春旭,. 在&beta;-NaGdF<sub>4</sub>:Tb<sup>3+</sup>纳米晶中<sup>5</sup>D<sub>3</sub>&rarr;<sup>5</sup>D<sub>4</sub>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 <sup>5</sup>D<sub>3</sub>&rarr;<sup>5</sup>D<sub>4</sub> and Local Density of States in &beta;-NaGdF<sub>4</sub>:Tb<sup>3+</sup> Nanocrystals[J]. Chinese Journal of Luminescence, 2014,35(12): 1443-1448
刘春旭,. 在&beta;-NaGdF<sub>4</sub>:Tb<sup>3+</sup>纳米晶中<sup>5</sup>D<sub>3</sub>&rarr;<sup>5</sup>D<sub>4</sub>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 <sup>5</sup>D<sub>3</sub>&rarr;<sup>5</sup>D<sub>4</sub> and Local Density of States in &beta;-NaGdF<sub>4</sub>:Tb<sup>3+</sup> Nanocrystals[J]. Chinese Journal of Luminescence, 2014,35(12): 1443-1448 DOI: 10.3788/fgxb20143512.1443.
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
4
:Tb
3+
NCs中Tb
3+
:
5
D
3
5
D
4
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
3+
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
R
<
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.
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
5
D
3
5
D
4
of Tb
3+
in -NaGdF
4
:Tb
3+
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
3+
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
R
<
35 nm
a new Gaussian distribution of LDOS was obtained based on Chew's theory outside the nanospheres.
多声子弛豫局域态密度&beta-NaGdF4:Tb3+介电纳米球自发衰减速率
multiphonon relaxationlocal density of states&beta-NaGdF4:Tb3+ dielectric nanospherespontaneous-decay rate
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