稀土掺杂的上转换发光薄膜材料制备及应用

发布时间：2018-01-11 21:03

本文关键词：稀土掺杂的上转换发光薄膜材料制备及应用　出处：《浙江大学》2015年博士论文　论文类型：学位论文

【摘要】：经济的发展也伴随着能源的不断消耗。近年来,自然资源短缺,能源危机,环境污染等问题的不断加剧,发光材料研究重点也逐渐向生物,清洁能源方向转变。太阳能做为清洁可持续绿色能源的之一而受到人们的广泛关注,而通常太阳能电池材料,如二氧化钛、氧化亚铜、氧化锌、碘氧化铋等,因为其禁带宽度大而不能利用太阳光中的近红外光,我们可以利用稀土离子上转换发光特点,与半导体材料结合,拓展太阳能电池的响应范围。本文就是在上转换发光材料及上转换发光与半导体材料复合,实现近红外光响应的复合薄膜电池方面开展了相关研究。薄膜电池在太阳能电池成本减少上具有一定的优势,而电沉积法制备薄膜因为成本低,可曲面生长,条件温和、易控制等特点,有利于实现大规模的工业生产。本论文在电化学法制备材料的基础上,结合太阳能电池应用需求及待解决的问题,针对性的进行了相关研究,提出了一些观点,并进行了初步的应用探索,具体包括如下五部分：1、采用阴极电沉积法和后续热处理制备了Yb3+-Er3+共掺杂的的氧化钇薄膜,并讨论了该薄膜在980nm激光器激发下的上转换发光性能,对电沉积的相关参数,温度、浓度、时间、等进行优化,找到最优的上转换红光薄膜Y203: 3% Yb3+-1%Er3+的制备条件。2、我们采用阳极电沉积技术首次合成了Yb3+-Tm3+共掺杂NaYF4薄膜,并通过XRD,TG-TDA,SEM对薄膜进行表征,对影响薄膜光学性能进行研究。在980 nm激光器激发下,该薄膜内由Yb3+吸收980nm光子能量,传能给Tm3+, Tm3+产生强烈上转换发光3、利用电化学法和离子交换法相结合,制备出(Y2O3:Yb3+-Er3+)/Bi2S3复合薄膜,Y2O3:Yb3+-Er3+薄膜在980nm激光器激发上转换产生可见光,然后被Bi2S3纳米颗粒吸收,最后产生光电流。并在溶液体系内,演示该复合薄膜的光电流响应。4、通过电化学法制备出(NaYF4:Yb3+-Tm3+)/Cu20复合薄膜,并通过光学性能测试证明了复合薄膜中可能的传能机理是：近红外光激发NaYR:Yb3+-Tm3+产生可见光,被氧化亚铜薄膜吸收,产生光电流,并在980 nm激光器和氙灯激发下,对该复合薄膜的光电流响应进行演示。5.(NaYF4:Yb3+-Er3+)/BiIO复合薄膜是先通过电化学法制备NaYFd: Yb3+-Er3+薄膜,然后利用离子交换法使BiIO与NaYF4:Yb3+-Er3+薄膜复合。该复合薄膜在聚焦的氙灯的近红外光照射下,NaYF4:Yb3+-Er3+通过上转换产生可见光,然后被半导体材料碘氧化铋吸收,产生光电流。
[Abstract]:In recent years, with the shortage of natural resources, energy crisis, environmental pollution and other problems, the research focus of luminescent materials has gradually turned to biology. The direction of clean energy. Solar energy as one of the clean and sustainable green energy has been widely concerned, but usually solar cell materials, such as titanium dioxide, cuprous oxide, zinc oxide, bismuth iodide and so on. Because the band gap is too wide to utilize the near-infrared light in the sun, we can combine the rare earth ions with semiconductor materials by using the characteristics of up-conversion luminescence of rare earth ions. Expand the response range of solar cells. This paper is in the upconversion of luminescent materials and up-conversion luminescence and semiconductor materials composite. Some researches have been carried out on the near-infrared photo-responsive composite thin film battery. The thin film battery has some advantages in reducing the cost of solar cells, while the electrodeposition method can grow the thin film surface because of its low cost. The conditions are mild and easy to control, which is conducive to the realization of large-scale industrial production. In this paper, on the basis of electrochemical preparation of materials, combined with the application of solar cells and the problems to be solved. Relevant research has been carried out, some viewpoints have been put forward, and preliminary application has been explored, including the following five parts: 1. Yb3 er 3 co-doped yttrium oxide thin films were prepared by cathodic electrodeposition and heat treatment. The upconversion luminescence properties of the films excited by 980nm laser were discussed. The parameters, temperature, concentration, time and so on of electrodeposition were optimized to find the optimal preparation conditions of Y203: 3% Yb3 -1 Er3. Yb3 Tm 3 co-doped NaYF4 thin films were synthesized by anodic electrodeposition for the first time and characterized by XRDX TG-TDA SEM. Under the excitation of 980nm laser, the Yb3 absorbs 980nm photon energy and transmits energy to Tm3. Tm3 produced a strong up-conversion luminescence 3. The Y _ 2O _ 3: Yb _ 3-er _ 3 / Bi _ 2S _ 3 composite films were prepared by the combination of electrochemical method and ion exchange method. Y2O3: Yb3-Er3 film is excited by a 980nm laser to produce visible light, then absorbed by Bi2S3 nanoparticles, resulting in photocurrent. The photocurrent-response of the composite film was demonstrated. The NaYF4: Yb3-Tm3 / Cu20 composite film was prepared by electrochemical method. The possible mechanism of energy transfer in the composite films was proved by optical properties test: near infrared light excited NaYR:Yb3 Tm 3 to produce visible light, was absorbed by cuprous oxide thin film, resulting in photocurrent. And excited by 980nm laser and xenon lamp. The photocurrent response of the composite film was demonstrated. 5. NaYF4: Yb3-Er3). First, NaYFd: Yb3-Er3 thin films were prepared by electrochemical method. Then the BiIO and NaYF4:Yb3-Er3 films were compounded by ion exchange method. The composite films were irradiated by the near-infrared light of the focused xenon lamp. NaYF4:Yb3-er 3 produces visible light by up-conversion and then is absorbed by bismuth iodide semiconductor material to produce photocurrent.
【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TB383.2

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