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首页> 外文期刊>Solid State Communications >Hydrostatic pressure induced splitting of recombination luminescence band in KTaO3: Manifestation of charge transfer vibronic exciton phase
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Hydrostatic pressure induced splitting of recombination luminescence band in KTaO3: Manifestation of charge transfer vibronic exciton phase

机译：静水压力诱导的KTaO3中重组发光带的分裂：电荷转移电子激子相的表现

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摘要

Hydrostatic pressure induced splitting of luminescence transitions under UV photoexcitation was observed in KTaO3 crystal. Two additional satellite bands of recombination luminescence arise at lower and higher energies with approximately the same shift with respect to the initial central band position. After the appearance of satellites at elevated hydrostatic pressures (1.9-6.1 GPa), the luminescence band shape does not exhibit any significant change with further increasing of the applied pressure up to 12.7 GPa. This effect is explained by light-induced occupation of Charge Transfer Vibronic Exciton (CTVE) ferroelectric phase. CTVE-phase occupation increases with hydrostatic pressure up to its proximity to the free CTVE level. Saturated ferroelectric order parameter of this phase splits the recombination luminescence band with two satellites' appearance. Hydrostatic pressure induced satellites in recombination luminescence can be considered as the CTVE-phase manifestation for KTaO3 crystal. (c) 2006 Elsevier Ltd. All rights reserved.
机译：在KTaO3晶体中观察到在紫外光激发下静水压力引起的发光转变的分裂。相对较低的能量和相对较高的能量，出现了两个附加的重组发光卫星带，它们相对于初始中心带位置的位移大致相同。在高静水压（1.9-6.1 GPa）下出现卫星之后，随着施加压力的进一步增加直至12.7 GPa，发光带的形状没有任何明显的变化。这种影响可以通过光诱导的电荷转移振动激子（CTVE）铁电相的占据来解释。当静水压力达到其接近自由CTVE水平时，CTVE相的占有率会增加。该相的饱和铁电有序参数将重组发光带分裂为两颗卫星。静水压力诱导的卫星在复合发光中可以被认为是KTaO3晶体的CTVE相表现。 （c）2006 Elsevier Ltd.保留所有权利。

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