摘要
本文提出了从Eu3 + 掺杂的玻璃材料激发光谱中声子边带确定黄昆因子的方法 ,并对制备的不同组份玻璃材料的黄昆因子进行了计算 ,研究了黄昆因子对玻璃组份的依赖关系 ,同时讨论了材料的无辐射跃迁行为。
The localized electronic state is different from the free atomic state in condensed matter. The strong or weak interaction between localized electronic state and the crystal lattice results in a big or small shift of the atomic balance site in solid states. This phenomenon was called crystal lattice relaxation. Rare earth ions may have a partially filled 4 f n (1≤n ≤13) electron shell both in free and in bound states. The peculiarities of the physical properties of rare earth compounds are determined by the presence of this partially filled shell. Internal 4 f electrons remain localized near their own nucleus and interact relatively weakly with the ligands. In this work, a serial of glasses with different ratios of H 3BO 3 and PbF 2 in molar and with same density of purity was prepared, using the solid melt method. The excitation spectra of Eu 3+ in these glasses were measured with the HITACHI F 4500 fluorescence spectroscopy, and the phonon sideband spectra were obtained from the excitation spectra. A detail script of the theory of electron phonon interaction in the condition of weakly coupling system, such as trivalent rare earth ions in the condensed matter, was confirmed. The experimental technique for obtaining phonon sideband spectra was concluded. Based on the theory, we proposed a method to obtain the Huang Rhys factor from the phonon sideband spectra of Eu 3+ in these serial glasses with different components. The Huang Rhys factors for different glasses were calculated. The relationship between Huang Rhys factor and sample components was obtained and discussed. Then we investigated the dependence of the constant α on the energy gap, between two levels, for different glasses with various Huang Rhys factors . The available area of energy gap law, A nr ,= Ce - α Δ E was discussed. Lastly for instance, we ticked off some values of α and C in different crystals, obtained by researchers. A detail analysis of effect of α and C on the nonradiative transitions was confirmed.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2001年第3期253-257,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金资助项目 ( 1980 40 11)
"973"国家重点基础研究发展规划 -稀土功能材料的基础研究资助项目(G19980 6 130 9)
吉林省科委资助项目
"86 3"计划资助项目 ( 86 3 715 0 0 3 0 0 10 )
