面向有源显示的有机电致发光器件研究
发布时间：2018-10-08 07:21
【摘要】：有机电致发光器件(organic light-emitting diodes,OLEDs)因具有材料合成简单、制备工艺容易、重量轻、自发光、色域广、可集成在不透明或者柔性衬底等优点,被业界认为是继阴极射线管、液晶之后的新一代显示技术。经过三十年来的发展,虽然OLED相关显示产品已从实验室悄然走入到我们的日常生活中,但是科研工作者对OLED器件性能的追求从未停止。OLED在工作寿命、成本、集成度等方面的综合性能还需要进一步提升。本论文面向有源显示,侧重于研究实用化的简单结构叠层OLED以及与低压驱动电路相兼容的顶发射OLED。本文的研究内容如下:(1)首先提出了“简单结构叠层OLED”的设计思想,即器件的上下发光单元及电荷产生单元(charge generation layer,CGL)均要求结构简单。本文选用Mo Ox作为最简单的CGL,Bphen:Li F作为CGL电子抽取层,连接两个简单结构黄色发光单元CBP/CBP:PO-01/TPBi,制备了简单结构黄色磷光叠层OLED,并通过优化CGL与下发光单元的注入势垒、改善发光区的载流子平衡等手段,最终获得了相对于单层器件电流效率翻番,功率效率相差无几的高性能简单结构叠层OLED。(2)首次突破前人在CGL选材以及结构设计方面的限制,选用最常见的空穴传输材料NPB以及电子传输材料Bphen设计了缓冲层修饰的非掺杂p/n型CGL,即Li F/NPB/Bphen/Mo Ox,通过系统研究器件性能与叠层OLED总厚度之间的变化关系,最终获得厚度仅为150 nm的高性能绿色磷光叠层OLED,电流效率从对应单层器件的38.5 cd/A提高到77.6 cd/A。NPB和Bphen不仅做CGL材料,还作为叠层器件上下发光单元的空穴传输层和电子传输层,材料种类的减少可以简化实验流程,提高可靠性,降低生产成本。同时,这种p/n型CGL也为国内外同行提供了开发高性能叠层OLED的新思路。(3)基于Ir(ppz)3、Bphen又开发出两款有效的缓冲层修饰p/n型和n/p型CGL。详细研究CGL缓冲层Mo Ox、Li F在电荷生成过程中所扮演的角色;利用热电子发射理论、隧穿模型解释了基于同种材料体系的两种CGL的不同电荷产生过程;在n/p型CGL插入2 nm的Ir(ppz)3:Mo Ox缓冲层进一步优化了叠层OLED的性能,使其获得了较好的光电性能指标,最大电流效率接近传统单发光层器件的两倍;最后通过对比Bphen/NPB与Bphen/Ir(ppz)3的界面电荷转移特性,认为Bphen/NPB并不适合做非掺杂的n/p型CGL。(4)利用Mo Ox掺杂层空穴注入特性好、电导率高、热稳定性好等优点分别制备了面向p型及n型TFT电路的顶发射OLED以及倒置顶发射OLED。在顶发射器件方面,发光层Tm PPPy Tz:Ir(ppy)3具有双极性传输特性,有利于载流子的平衡;50 nm Tc Ta盖层的使用也提高了器件的光耦合输出效率;4 V的电压条件下,顶发射器件的亮度达4755 cd/m2,性能优良。在倒置顶发射器件方面,制备了蓝、绿、红三色的倒置顶发射OLED,由于微腔效应的作用,蓝绿器件较传统底发射器件的外量子效率提高15%左右;由于红光染料带系较窄,材料的内量子产率会随微腔环境的变化出现较大幅度的变动,最终使得红光倒置顶发射OLED的外量子效率提高了100%。最后将优化后的顶发射OLED移植到SVGA微显示芯片中,显示效果良好。
[Abstract]:The organic electroluminescent device (O1R) has the advantages of simple material synthesis, easy preparation process, light weight, self-luminescence, wide color gamut, and can be integrated in an opaque or flexible substrate, and is regarded as a new generation display technology after the cathode ray tube and liquid crystal. After three decades of development, although OLED-related display products have quietly entered our daily life from the lab, the pursuit of OLED device performance by researchers has never stopped. the comprehensive performance of the OLED in terms of service life, cost, integration and the like also needs to be further improved. This paper focuses on active display, which focuses on the research of practical simple laminated OLED and top-emitting OLED which is compatible with low-voltage drive circuit. The research contents of this paper are as follows: (1) First, the design idea of the 鈥淪imple structure laminated OLED鈥，
本文编号：2255908
[Abstract]:The organic electroluminescent device (O1R) has the advantages of simple material synthesis, easy preparation process, light weight, self-luminescence, wide color gamut, and can be integrated in an opaque or flexible substrate, and is regarded as a new generation display technology after the cathode ray tube and liquid crystal. After three decades of development, although OLED-related display products have quietly entered our daily life from the lab, the pursuit of OLED device performance by researchers has never stopped. the comprehensive performance of the OLED in terms of service life, cost, integration and the like also needs to be further improved. This paper focuses on active display, which focuses on the research of practical simple laminated OLED and top-emitting OLED which is compatible with low-voltage drive circuit. The research contents of this paper are as follows: (1) First, the design idea of the 鈥淪imple structure laminated OLED鈥，
本文编号：2255908
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