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Chinese Journal of Luminescence

Optical Storage and Spectrum Properties of Electron Trapping Materials SrS∶Eu, Sm, Er

王英 Wang Ying, 郝振东 HAO Zhen-dong, 张霞 ZHANG Xia, 张家骅 ZHANG Jia-hua

Published Jan 1, 2013• 0 citations
Publisher

Abstract

提出一种Er3+改进的电子俘获光存储材料SrS∶Eu0.002,Sm0.002,Erx,其中,0≤x≤0.006。通过水热反应,研究了不同退火温度对荧光粉晶相形成的影响,以及不同含量的Er3+对荧光粉的发光性质以及光存储特性的影响。结果表明,Er3+的引入导致荧光增强及光存储特性提高。当Er3+的摩尔分数x=0.003时,荧光强度、光激励发光强度及光存储量出现最大值,分别为不含Er3+时的1.9倍、2倍和3.5倍。同时,Er3+的掺入不改变样品的晶体结构和衰减特性。

DOI
10.3788/fgxb20133403.0251

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提出一种Er3+改进的电子俘获光存储材料SrS∶Eu0.002,Sm0.002,Erx,其中,0≤x≤0.006。通过水热反应,研究了不同退火温度对荧光粉晶相形成的影响,以及不同含量的Er3+对荧光粉的发光性质以及光存储特性的影响。结果表明,Er3+的引入导致荧光增强及光存储特性提高。当Er3+的摩尔分数x=0.003时,荧光强度、光激励发光强度及光存储量出现最大值,分别为不含Er3+时的1.9倍、2倍和3.5倍。同时,Er3+的掺入不改变样品的晶体结构和衰减特性。
A new concept for an erasable optical memory is demonstrated using stimulated electronic transition (SET). Large bandgap semiconductors are suitable materials for the SET medium. We have investigated the properties of MgS:Eu, Sm and SrS:Eu, Sm as possible media for the SET process. Quantum storage is achieved in the form of charges in deep levels in the medium and stimulated radiative recombination is used as the reading process. Unlike magneto-optic (M-O) and phase change (PC) processes, optical writing, reading and erasing are achieved without localized heating. The SET process will have an inherently faster data transfer rate and a higher storage density, and the medium will be more durable than the M-O and PC media. A possible application of the SET process in neural networks is also discussed.
高效的光调制能够显著提高光转换效率和调节光响应速率，在光电子学领域中表现出巨大的应用潜力。然而，光子之间的弱相互作用对操纵光子⁃光子相互作用造成了巨大的障碍。本文采用850 nm和1 550 nm激光同时激发含有Er3+∶NaYF4纳米晶体的氧氟化物微晶玻璃，可以实现绿色上转换荧光的快⁃慢光调制。与两束单波长激发的发光强度之和相比，双波长同时激发的绿色上转换发光强度明显提高了一个数量级。值得注意的是，绿色上转换发光快⁃慢响应速率依赖于双波长激发的泵浦策略，显示出高达4倍的快⁃慢响应差异。研究表明，双波长激发绿色上转换发光的快⁃慢光调制在新型的全光开关中具有广阔的应用前景。
Er 3 + color centers are promising candidates for quantum science and technology due to their long electron and nuclear spin coherence times, as well as their desirable emission wavelength. By selecting host materials with suitable, controllable properties, we introduce new parameters that can be used to tailor the Er3+ emission spectrum. PbTiO3 is a well-studied ferroelectric material with known methods of engineering different domain configurations through epitaxial strain. By distorting the structure of Er3+-doped PbTiO3 thin films, we can manipulate the crystal fields around the Er3+ dopant. This is resolved through changes in the Er3+ resonant fluorescence spectra, tying the optical properties of the defect directly to the domain configurations of the ferroelectic matrix. Additionally, we are able to resolve a second set of peaks for films with in-plane ferroelectric polarization. We hypothesize these results to be due to either the Er3+ substituting different sites of the PbTiO3 crystal, differences in charges between the Er3+ dopant and the original substituent ion, or selection rules. Systematically studying the relationship between the Er3+ emission and the epitaxial strain of the ferroelectric matrix lays the pathway for future optical studies of spin manipulation by altering ferroelectric order parameters.
Rare-earth-ion doped crystals are a promising platform for applications in microwave-to-optical transduction. Erbium is of special interest because of its telecom wavelength optical transitions. This work investigates the optical and electron-spin properties of Er3+{}^{3+}3+:YVO4{}_{4}4​. An initial transduction of classical microwave signal using this material is demonstrated. The measured strong optical dipole moment and narrow ensemble inhomogeneities make Er3+{}^{3+}3+:YVO4{}_{4}4​ a promising material for microwave-to-optical transduction.