电致发光衰减测量系统的搭建及应用

发布时间：2018-01-10 06:14

本文关键词：电致发光衰减测量系统的搭建及应用　出处：《光谱学与光谱分析》2017年07期 　论文类型：期刊论文

【摘要】：发光衰减是发光的重要过程,测量发光寿命对研究发光机理十分重要,但传统研究在概念和方法上存在两个差错:(1)概念上认为衰减等同于激发态数目的减少,而忽视了衰减是发光强度的下降,两者是不同的概念;(2)方法上基于激发态规律推导,假设的边界条件不符合实际,没有实验的支持。同时,传统方法对设备的要求很高,且只限于光致发光。为了纠正差错,降低成本,搭建了一套全新的电致发光衰减测量系统,可用于所有可以周期激发的发光类型。从能量转换原理出发,采用周期激发,用脉冲间隔时间作为时间尺度来度量发光衰减持续的时间,通过脉冲间隔时间与发光寿命的对比,相应地发光强度有不同的变化,根据该现象简便地测量出发光寿命。基于该原理搭建的发光衰减测量系统,实验结果表明了发光强度随着激发频率,先保持不变然后逐渐下降,通过测量下折点即能够推算出发光衰减寿命,而且还发现发光衰减寿命与初始发光强度呈正相关的关系。认为发光寿命是发光强度的变化,是区别于传统研究以激发态数目为研究对象的一大创新,同时通过实验证明了发光寿命与初始亮度相关,也拓展了对发光寿命的新认识。
[Abstract]:Luminescence attenuation is an important process of luminescence, and it is very important to study the mechanism of luminescence by measuring luminescence lifetime. However, in the traditional research, there are two errors in concept and method: 1) the concept of attenuation is equal to the reduction of the number of excited states, but the attenuation is the decrease of luminous intensity, and the two are different concepts. 2) based on the law of excited state, the assumed boundary conditions do not accord with the reality, and there is no experimental support. At the same time, the traditional method requires very high equipment, and only limited to photoluminescence, in order to correct the errors. In order to reduce the cost, a new electroluminescent attenuation measurement system is set up, which can be used for all kinds of luminescence which can be excited periodically. Based on the principle of energy conversion, periodic excitation is adopted. The pulse interval time is used as the time scale to measure the duration of luminescence attenuation. By comparing the pulse interval time with the luminous lifetime, the luminous intensity varies accordingly. The luminescence attenuation measurement system based on this principle is constructed. The experimental results show that the luminous intensity is kept unchanged and then gradually decreased with the excitation frequency. The decay lifetime of luminescence can be calculated by measuring the folding point, and it is also found that there is a positive correlation between the decay lifetime of luminescence and the initial intensity of luminescence. It is considered that the lifetime of luminescence is the change of the intensity of luminescence. It is a big innovation which is different from the traditional research on the number of excited states. At the same time, the experiment proves that the luminous lifetime is related to the initial brightness, and it also expands the new understanding of the luminous lifetime.
【作者单位】：北京交通大学发光与光信息技术教育部重点实验室光电子技术研究所;
【基金】：国家高技术研究发展计划(863计划)项目(2013AA032205) 国家自然科学基金项目(51272022,61575019,11474018) 教育部博士点基金项目(20130009130001,20120009130005) 中央高校基本科研业务费专项资金项目(2012JBZ001)资助
【分类号】：TN312.8
【正文快照】： 引言20世纪30年代,许多高能物理实验室观察到γ射线经过液体会产生淡蓝色的辐射现象,把它误认为发光。苏联科学家瓦伦洛夫和他的助手切伦科夫尝试测量其发光寿命,但却无法发现发光衰减的过程,原因在于粒子在介质中的速度要大于光在介质中的速度[1-3]。该现象被命名为切伦科夫

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