【作者】 张佳；

【导师】 白雪；

【作者基本信息】 吉林大学 ， 集成电路工程（专业学位）， 2020， 硕士

【摘要】 在当今的信息社会中,显示技术可以提高人们生活的便利性和质量。随着显示技术的发展,人们对色彩饱和度和鲜艳度提出了更高的要求。作为显示领域基本单元之一的发光二极管（light emitting diodes,LED）已经成为了主要研究对象。近年来,具有高发光量子产率（photoluminescence quantum yield,PLQY）,窄发光峰和宽色域等优点的钙钛矿量子点（quantum dots,QDs）引起了人们的特别关注。迄今为止,钙钛矿量子点材料已经在光电和光伏器件等领域被深入研究并且取得了令人瞩目的成果。其中,钙钛矿量子点LED的性能提升速度飞快。钙钛矿量子点LED在性能上已经成为有机发光二极管（organic light emitting diodes,OLED）和传统镉族量子点LED的强有力的竞争对手。尽管基于钙钛矿量子点材料的LED表现出出色的性能,但在本论文研究初始阶段,钙钛矿量子点LED在显示中的应用却很少。针对上述问题,我们首先采用热注入法制备了发光颜色为红光的CsPbI₃钙钛矿量子点材料,通过优化器件结构,提升了钙钛矿量子点LED的性能。更重要的是,我们将钙钛矿量子点LED作为基本单元制备了显示阵列器件。并且从浓度调控及器件结构调试两个方面,我们成功地解决了在制作过程中出现的严重的串扰问题,最终得到均匀的8段数码管。以下对研究内容进行简单的介绍:（1）通过热注入法,我们成功制得了CsPbI₃钙钛矿量子点,其吸收峰和发光峰分别位于677 nm和690 nm。将其作为发光层材料,我们制备了CsPbI₃钙钛矿量子点LED,亮度高达800 cd/m²,外量子效率（external quantum efficiency,EQE）高达7.5%。（2）由于设备密集精细,易产生串扰问题。为了解决串扰问题,通过对LED器件结构的不断优化,包括电极材料、载流子传输层材料的选择,ITO距离,电极的距离以及器件每层材料的浓度和厚度的调控,我们成功地将CsPbI₃钙钛矿量子点LED作为基础单元应用到显示中,得到最大亮度为780 cd/m²,EQE为6%的均匀性良好的八段数码管器件,成功实现了单色钙钛矿量子点LED在显示领域的一个应用。这一工作为推进钙钛矿量子点LED在全彩显示领域的应用奠定了坚实的基础。更多还原

【Abstract】 In this information society,display technology can improve the convenience and quality of people’s lives.With the development of the display technology,there are higher requirements for color saturation and vividness.As a base unit,light-emitting diodes（LEDs）have become a primary object of study.Perovskite quantum dots（QDs）with high photoluminescence quantum yield（PLQY）,narrow emission and wide color gamut have attracted special attention in recent years.Up to now,perovskite QDs have been conducted with thorough studies in the optoelectronic and photovoltaic device fields.Among them,the performance of perovskite light-emitting diode（LED）has been improved rapidly.Perovskite LEDs have become a competitor to organic LEDs（OLEDs）and conventional QD LEDs（QLEDs）based on chalcogenides.Although LEDs based on perovskite exhibit excellent performance,there are few applications of perovskite LEDs in display.Herein,LEDs based on CsPbI₃ perovskite were used as basic units for fabricating eight-segment LED displays.At the beginning of the research in this paper,the application of perovskite QDs LEDs in displays is seldom.In order to solve the above problems,first,the CsPbI₃ perovskite QDs material with a red color was synthesized by the thermal injection method.By optimizing the device structure,the performance of the perovskite QDs LED is improved.Second,perovskite QDs LEDs were used as the basic unit to prepare display array devices.During the production process,though serious crosstalk problems occurred.Starting from the two aspects of concentration control and device structure debugging,a uniform8-segment digital tube was successfully obtained.The following briefly introduces the research content:（1）We have successfully synthesized CsPbI₃ perovskite QDs bythermal injection method.The absorption and luminescence peaks are located at 677 nm and 690 nm,respectively.Using it as the light-emitting layer material,the CsPbI₃ perovskite QDs LEDs were fabricated,the LEDs exhibited a luminance of 800 cd/m² and an external quantum efficiency（EQE）of 7.5%.（2）Because the device is dense and fine,it is easy to produce crosstalk.In order to overcome the problem of crosstalk,we have continued to optimize the structure of LED devices,including the selection of electrode materials,and carrier transport layer materials,and the control of ITO distance,electrode distance,and most importantly the concentration and thickness of the layers.Through continuous exploration and experiments,the CsPbI₃ perovskite QDs LEDs as the basic unit were successfully used in the display.The LEDs exhibited a luminance of 780 cd/m² and an external quantum efficiency（EQE）of 6%.This research successfully realized an application of the monochromatic perovskite QDs LEDs in the display field.It has laid a solid foundation for advancing the application process of perovskite QDs LEDs in the field of full color display.更多还原