Phonon Energy Dependent Energy Transfer Upconversion for the Red Emission in the Er3+/Yb3+ System
Phonon Energy Dependent Energy Transfer Upconversion for the Red Emission in the Er3+/Yb3+ System
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Er3 /Yb3 系统中红光发射的声子能量依赖能量转移上转换
DOI：
10.1021/acs.jpcc.8b02446
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发表时间：
2018-04
影响因子：
3.7
通讯作者：
Zhang Jiahua
中科院分区：
文献类型：
--
作者：
Wu Hao;Hao Zhengdong;Zhang Liangliang;Zhang Xia;Xiao Yu;Pan Guo-Hui;Wu Huajun;Luo Yongshi;Zhao Haifeng;Zhang Jiahua
基于Er 3 +/Yb 3+组合的980 nm激发下的上转换红光发射对于生物成像应用是非常有吸引力的。观察到的红色发射的强度是强烈依赖于主机材料。然而，行为的起源和数量依赖性仍然不清楚。本文研究了三种常见的具有不同声子能量的基质（β-NaYF 4，Ba_5Gd_8Zn_4O_21和Y_2O_3）通过Yb ~（3+）的能量转移从Er ~（3+）中间态4 I ~（13/2）到4F ~（9/2）能级的第二步UC激发的有效性。计算了它们的红光发射效率，并首次报道了Ba_5Gd_8Zn_4O_（21）中4F_（9/2）能级的辐射寿命。我们提出了一种光谱方法来评估的相对能量转移系数的三个主机，发现该系数显着增加的声子能量的增加，反映了声子辅助的能量转移的本质。β-NaYF_4的相关系数为89。
The red emission through upconversion (UC) upon 980 nm excitation based on Er3+/Yb3+ combination is very attractive for bioimaging applications. The intensity of the red emission is observed to be strongly dependent on the host materials. However, the origin of the behavior and the quantitative dependence remain unclear. Here, the effectiveness of the second step UC excitation from the Er3+ intermediate state 4I13/2 to the 4F9/2 level by energy transfer from Yb3+ is studied for three popular hosts (β-NaYF4, Ba5Gd8Zn4O21, and Y2O3) that have different phonon energies. Their emission efficiencies of the red emitting state are calculated, and the radiative lifetime of the 4F9/2 level in Ba5Gd8Zn4O21 is reported for the first time. We present a spectroscopic method to evaluate the relative energy transfer coefficients for the three hosts and find the coefficient increases markedly with the increase of phonon energy, reflecting the nature of phonon-assisted energy transfer. The coefficient for β-NaYF4 is 89 an...