磷酸盐玻璃中Yb3+和Nd3+之间的声子参助能量转移

本文中报道了磷酸盐玻璃中Nd³⁺,Yb³⁺的时间分辨谱和激发能量的转移。通过实验确定了在不同温度下的转移速率。证实了Nd³⁺→Yb³⁺的能量转移机构为从⁴F_3/2(Nd³⁺)到²F_5/2(Yb³⁺)并同时产生单声子发射的过程;而从Yb³⁺到Nd³⁺关键词：

PHONON-ASSISTED TRANSFER BETWEEN Yb3+ AND Nd3+ IN PHOSPHATE GLASS

This paper reports the spectra and the excited energy transfer in phosphate glass doped with Nd³⁺ and Yb³⁺. The transfer rates are determined experimentally, at different tempcralures. We confirme that the mechanism of energy transfer is a process in which the energy is transferred from ⁴F_3/2(Nd³⁺) to ²F_5/2(Yb³⁺) and at the same time a single phonon is emitted. The energy back transfer process from Yb³⁺ to Nd³⁺ may occur in two possible ways, one is the process ²F_5/2(Yb³⁺)→⁴F_3/2(Nd³⁺) which is accompanied by the absorption of a single phonon, and the other is the process ²F_5/2(Yb³⁺)→⁴I_15/2(Nd³⁺), being accompanied by emission of 4 phonons. Therefore Yb³⁺→Nd³⁺ transfer rate depends strongly upon the temperature. At room temperature, the transfer time from Nd³⁺ to Yb³⁺ and from Yb to Nd are 197μs and 13ms respectively. The efficiency of energy transfer is 47% for Nd³⁺→Yb³⁺ and 8% for Yb³⁺→ Nd³⁺.