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Luminescence and characteristics of electron-holeplasma created in wide-band-gap crystals by ion irradiation.

通过离子辐照在宽带隙晶体中产生的电子空穴等离子体的发光和特性。

基本信息

批准号：
11440127
负责人：
KIMURA Kazuie
金额：
$ 1.09万
依托单位：
The Institute of Physical and Chemical Reserch (RIKEN)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

We are interested in high-density excitation by heavy ions, which is the highest exclitation in the present methods. In case of excitation of insulators with wide band-gaps, the intensity of excitation density by heavy ibns is three ofders higher thap tera W laser. In order to search phenomena characteristic to ion irradiation and elucidate dynamics of ion-tracks at initial stages. we developed a single ion and single photon (SISP) coincidence techaiques. At present, the time resolution is about, 85 ps, which is the fastest tool and is. better at least by order than usual techniques for ions. By application of SISP, we found ultra-fast luminescence commonly for many insulator crystals. Such lumjnescence has been not oberved and cannot be explained by so-far understanding. We proposed electron-hole plasma as origin of the fast luminescence with showimg evidences : non-tailed fast decay, super-linear excitation-density dependence of yield, sampl e dependence of yield, and little influence of temperaturle. However, there must be yet many unknown chaiacteristics regaiding with. e-h plasma in insulators, considering that e-h plasma in insulators is the frst finding and at starting point. Ih addition, so far our tirne-resolved spectra were apt to be influenced by beam fluctuation In order to overcome this week point and obtain precise spectra, we planed to construct simultaneous 8-wavelengths SISP and nbw this system is ready to measurements. However, the ion accelerator is in reconstruction since the last April. We are waiting the operation ofthe accelerator.

我们对重离子的高密度激发感兴趣，这是目前方法中最高的激发。在宽频带绝缘子的激励下，重型激光器的激励密度强度比激光高3倍。为了寻找离子辐照的特征现象，阐明离子轨迹在初始阶段的动力学。我们开发了单离子和单光子（SISP）重合技术。目前，时间分辨率约为85ps，这是目前最快的工具。至少在顺序上比通常的离子技术要好。通过应用SISP，我们发现许多绝缘体晶体普遍存在超快发光现象。这种发光还没有被观察到，也无法用目前的理解来解释。我们提出了电子-空穴等离子体作为快速发光的起源，证据表明：无尾快速衰减，产率依赖于超线性激发-密度，产率依赖于样品，温度影响很小。然而，在这方面肯定还有许多未知的特征。绝缘体中的E-h等离子体，考虑到绝缘体中的E-h等离子体是第一次发现，并且是在起点。另外，目前我们的光谱容易受到光束波动的影响，为了克服这一点，获得精确的光谱，我们计划在该系统准备测量时同时构建8波长的SISP和nbp。然而，自去年4月以来，离子加速器一直在重建中。我们正在等待加速器的操作。