The Study of p,n Control of room-temparature Photoluminescence Thin Films

购买了数字开尔文证明，并将系统连接到我们的特高压系统。该系统用于测量脉冲激光沉积样品的功函数。制备的样品的功函数可以通过探针尖端和样品之间的电荷差间接测量，即所谓的CPD值。该系统需要标准样品，例如Au、Ag和Si，它们的功函数是已知的，并且它们的CPD值必须作为它们功函数的函数来测量。研究发现，掺杂离子对其表面电荷分布有显著影响，并由此估算出出乎意料的大功函数值。数字开尔文证明只报告了很少的结果，因此需要区分系统是否可以测量。还应该考虑到探针的大表面积要求样品表面的非均质性。在这个系统中，我们共同…进一步测量了K/O/Si纳米粒子的功函数。据报道，在碱/氧/硅混合体系中，由于负电子亲和势(NEA)的存在，功函数急剧下降。到目前为止，已报道的最小功函数值为0.8 eV，而在K/O/Si纳米粒子中，我们可以获得0.7 eV的功函数。我们期待该系统可以作为冷发射材料之一。目前已经发表了一些论文。成功地制备了离子掺杂的CdWO4薄膜，其发光强度得到了极大的提高。报道了激光能量密度对脉冲激光烧蚀制备的硅物种终止的影响。硅物种可以被包裹在沸石超笼中，并显示出特定的发光。对该体系的时间分辨荧光光谱进行了研究，发现包埋在沸石孔道中的硅物种具有很短的纳秒衰减时间，这在该体系中具有重要意义。利用目前的数字开尔文测头系统，设计了对这些有趣的材料进行p型或n型辨别的方法。较少

Digital Kelvin prove was purchased and the system was attached to our UHV system. The system worked to measure work functions of the samples prepared with pulsed laser deposition. Work functions of the prepared samples can be measured by the charge difference between the probe tip and the sample so called CPD value indirectly. The system needed standard samples, for instance, Au,Ag,and Si whose work functions have been known and their CPD values have to be measured as a function of their work functions. It was found that doped ions in CdWO4 single crystals played significant roles on the charge distribution on their surfaces and therefore unexpectedly large work function values were apparently estimated. Only few results have been reported with digital Kelvin prove so that it is required to distinguish whether the system is measurement possible or not. It should be also considered that large surface area of the probe demands the heterogeneity of the sample surface.In this system, we co … More uld measure the work function measurement on the K/O/Si nanoparticles. It is reported that work function drastically decreases in the system of alkaline/oxygen/Silicon mixture because of negative electron affinity(NEA). So far the smallest work function value of 0.8eV has been reported, however, we could obtain 0.7eV in the K/O/Si nanoparticles. We are expecting that the system could work as one of cold emission materials.Some papers have been published. Ion-doped CdWO4 thin films have been successfully prepared and their PL intensities were drastically enhanced. The effect of laser fluence on the termination of Si species prepared with pulsed laser ablation was reported. The Si species could be encapsulated in zeolite supercages and showed specific PL. The time resolved PL spectra were studied on this system and it was found that Si species encapsulated in zeolite pores shows very short nanoseconds decay time which is quite significant in this system. The discrimination of p-type or n-type is designed to these interesting materials with the present digital Kelvin probe system. Less