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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Enhancement of the luminescent characteristics of Li-doped CaTiO3: Pr3+ thin films grown by pulsed laser deposition
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Enhancement of the luminescent characteristics of Li-doped CaTiO3: Pr3+ thin films grown by pulsed laser deposition

机译：通过脉冲激光沉积生长的掺锂CaTiO3：Pr3 +薄膜的发光特性的增强

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摘要

The influence of Li doping on the crystallization, surface morphology and luminescent properties of CaTiO3 : Pr3+ films has been investigated. The films were grown on Al2O3 (0001) substrates using the pulsed laser deposition method under different oxygen pressures. The substrate temperature was fixed at 700 degrees C and the range of oxygen pressure was 100-400 mTorr. The crystallinity and surface morphology of the films were investigated using x-ray diffraction and atomic force microscopy, respectively. The emitted radiation at 322 nm excitation was dominated by a red emission peak at 613 nm radiated from the transition of D-1(2) -> H-3(4) of Pr3+ ions. In particular, the incorporation of Li+ ions into the CaTiO3 lattice could induce the increase in the intensity of the photoluminescence. The enhanced luminescence may result not only from the improved crystallinity but also from the reduced internal reflections caused by rougher surfaces. The luminescent intensity and surface roughness exhibited similar behaviour as a function of the oxygen pressure.
机译：研究了Li掺杂对CaTiO3：Pr3 +薄膜的结晶，表面形貌和发光性能的影响。使用脉冲激光沉积方法在不同的氧气压力下，在Al2O3（0001）衬底上生长薄膜。将基板温度固定在700℃，并且氧气压力的范围是100-400mTorr。分别使用X射线衍射和原子力显微镜研究了膜的结晶度和表面形态。在322 nm激发下发出的辐射主要由从Pr-1 +离子的D-1（2）-> H-3（4）的跃迁发出的613 nm处的红色发射峰占据。特别地，将Li +离子掺入CaTiO 3晶格中可引起光致发光强度的增加。增强的发光不仅可以归因于结晶度的改善，还可以归因于由较粗糙的表面引起的内部反射的减少。发光强度和表面粗糙度根据氧气压力表现出相似的行为。

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