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首页> 外文期刊>Crystallography reports >Impurity trapped exciton states related to rare earth ions in crystals under high hydrostatic pressure
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Impurity trapped exciton states related to rare earth ions in crystals under high hydrostatic pressure

机译：高静水压下与晶体中稀土离子有关的杂质俘获激子态

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Emission related to rare earth ions in solids takes place usually due to 4f~n → 4f ~n and 4f ~(n-1)5d ~1 → 4f ~n internal transitions. In the case of band to band excitation the effective energy transfer from the host to optically active impurity is required. Among other processes one of the possibilities is capturing of the electron at excited state and hole at the ground state of impurity. Localization of electron or hole at the dopand site creates a long range Coulomb potential that attracts the second carrier which then occupies the localized Rydberg-like states. Such a system can be considered as impurity trapped exciton. Usually impurity trapped exciton is a short living phenomenon which decays non-radiatively leaving the impurity ion in the excited state. However, in several compounds doped with Eu~(2+) the impurity trapped exciton states become stable and contribute to the radiative processes though anomalous luminescence that appears apart of the 4f ~7 → 4f ~7 and 4f ~75d ~1 → 5f ~7 emission. In this contribution pressure effect on energies of the 4f ~(n-1)5d ~1→5f ~n transitions in Ln doped oxides and fluorides as well as influence of pressure on the energy of impurity trapped exciton states is discussed. The latest results on high pressure investigations of luminescence related to Pr~(3+), and Eu~(2+) in different lattices are reviewed.
机译：固体中与稀土离子有关的发射通常是由于4f〜n→4f〜n和4f〜（n-1）5d〜1→4f〜n内部跃迁而发生的。在能带间激发的情况下，需要从主体到旋光杂质的有效能量转移。在其他过程中，一种可能性是捕获处于激发态的电子并捕获杂质的基态的空穴。电子或空穴在多巴德位点的局域化产生了一个长距离库仑电势，该库仑电势吸引了第二个载流子，后者随后占据了局部的里德伯格样态。这样的系统可以被认为是杂质捕获的激子。通常，杂质捕获的激子是短寿命现象，其以非辐射方式衰减，使杂质离子处于激发态。然而，在几种掺有Eu〜（2+）的化合物中，尽管在4f〜7→4f〜7和4f〜75d〜1→5f〜之外出现了异常发光，但是杂质捕获的激子态变得稳定并有助于辐射过程。 7发射。在此贡献中，讨论了压力对掺杂Ln的氧化物和氟化物中4f〜（n-1）5d〜1→5f〜n跃迁的能量的影响，以及压力对杂质俘获的激子态能量的影响。综述了不同晶格中与Pr〜（3+）和Eu〜（2+）有关的发光的最新高压研究结果。

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