双波段白色有机发光二极管结构及性能的改善
发布时间：2018-11-12 13:10
【摘要】：有机电致发光二极管(OLED)以其节能、可视化角度大、发光效率高、响应速度快、无炫光,可实现柔性化等优点,被普遍认为是下一。代的照明及显示技术。OLED从发展到现存已有20多年的历史,生产成本较高,色稳定性控制难,效率需要进一步等原因,致使OLED至今都没能在我们的生活中大规模的普及。本论文根据以上提出的问题,从OLED的发光原理出发,通过优化器件的结构等方式来改善双波段发光器件的性能。本论文的研究内容包括以下几方面： 1.针对白色荧光器件启亮电压较高的问题,设计了由红色荧光材料DCJTB和蓝色荧光材料OXD-7组成的双波段白光器件,通过采用在空穴注入层NPB与发光层OXD-7之问增加能级缓冲层和在OXD-7中掺杂双极性材料CBP两种方式来减小空穴的传输势垒,从而降低器件的启亮电压。 2.针对白色磷光器件在高电流密度下容易发生效率滚降和色稳定性差的问题,设计了mCP掺杂Firpic作为蓝色发光层和CBP掺杂1r(MDQ)2acac作为红色发光层的双波段白光器件。通过在蓝色发光层和红色发光层之间增加中问层mCP的方法,阻止了三线态激子湮灭导致的效率滚降,提高了器件的发光效率；通过在红色发光层与电子传输层TPBi之问增加单层mCP的方法控制激子的复合区域,提高了器件的色稳定性。 3.针对荧磷混合器件,磷光层中的大量三重态激子能量回传给荧光层造成许多三重态激子为不发光模式的问题,设计了以Firpic为蓝色磷光发光材料和DCJTB为红色荧光发光材料的双波段白光器件。采用在发光层之问添加TCTA作为中间阻挡层和提高空穴注入层NPB与Firpic主体材料之间的能级势垒两种方式来调节三线态激子能量传递,从而提高了蓝光的发光强度,改善了器件的发光颜色和亮度,使器件颜色更接近白光并且器件亮度明显提升。
[Abstract]:Organic electroluminescent diode (OLED) is considered to be the next one because of its advantages such as energy saving, large visual angle, high luminous efficiency, fast response, no glare, flexibility and so on. OLED has been developed for more than 20 years, the production cost is high, the control of color stability is difficult, and the efficiency needs to be further. As a result, OLED has not been widely used in our daily life. In this paper, based on the principle of OLED, the performance of dual-band light-emitting devices is improved by optimizing the structure of the devices. The research content of this thesis includes the following aspects: 1. A dual-band white light device composed of red fluorescent material DCJTB and blue fluorescent material OXD-7 is designed to solve the problem of high starting voltage of white fluorescent devices. By increasing the energy level buffer layer between the hole injection layer (NPB) and the luminescent layer (OXD-7) and doping the bipolar material CBP in the OXD-7, the transmission barrier of the hole is reduced, thus the starting voltage of the device is reduced. 2. In order to solve the problem that white phosphorescence devices are prone to efficiency rollout and poor color stability at high current density, a dual-band white light device with mCP doped Firpic as blue luminescence layer and CBP doped 1r (MDQ) 2acac as red luminescent layer is designed. By adding the intermediate layer mCP between the blue layer and the red layer, the efficiency of the three-line exciton annihilation is prevented and the luminescence efficiency of the device is improved. The color stability of the device is improved by adding a single layer mCP between the red luminescence layer and the electron transport layer (TPBi) to control the recombination region of the exciton. 3. For fluorophos mixers, a large number of triplet excitons in the phosphor layer are transmitted back to the fluorescence layer, causing many triplet excitons to be in non-luminescent mode. A dual band white light device using Firpic as blue phosphorescence material and DCJTB as red fluorescent material is designed. By adding TCTA to the luminescent layer as the intermediate barrier layer and increasing the energy level barrier between the hole injection layer NPB and the main material of the Firpic, the energy transfer of the three-wire exciton is regulated, thus the luminescence intensity of the blue light is improved. The luminous color and luminance of the device are improved, the color of the device is closer to white light and the brightness of the device is improved obviously.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN383.1
本文编号：2327203
[Abstract]:Organic electroluminescent diode (OLED) is considered to be the next one because of its advantages such as energy saving, large visual angle, high luminous efficiency, fast response, no glare, flexibility and so on. OLED has been developed for more than 20 years, the production cost is high, the control of color stability is difficult, and the efficiency needs to be further. As a result, OLED has not been widely used in our daily life. In this paper, based on the principle of OLED, the performance of dual-band light-emitting devices is improved by optimizing the structure of the devices. The research content of this thesis includes the following aspects: 1. A dual-band white light device composed of red fluorescent material DCJTB and blue fluorescent material OXD-7 is designed to solve the problem of high starting voltage of white fluorescent devices. By increasing the energy level buffer layer between the hole injection layer (NPB) and the luminescent layer (OXD-7) and doping the bipolar material CBP in the OXD-7, the transmission barrier of the hole is reduced, thus the starting voltage of the device is reduced. 2. In order to solve the problem that white phosphorescence devices are prone to efficiency rollout and poor color stability at high current density, a dual-band white light device with mCP doped Firpic as blue luminescence layer and CBP doped 1r (MDQ) 2acac as red luminescent layer is designed. By adding the intermediate layer mCP between the blue layer and the red layer, the efficiency of the three-line exciton annihilation is prevented and the luminescence efficiency of the device is improved. The color stability of the device is improved by adding a single layer mCP between the red luminescence layer and the electron transport layer (TPBi) to control the recombination region of the exciton. 3. For fluorophos mixers, a large number of triplet excitons in the phosphor layer are transmitted back to the fluorescence layer, causing many triplet excitons to be in non-luminescent mode. A dual band white light device using Firpic as blue phosphorescence material and DCJTB as red fluorescent material is designed. By adding TCTA to the luminescent layer as the intermediate barrier layer and increasing the energy level barrier between the hole injection layer NPB and the main material of the Firpic, the energy transfer of the three-wire exciton is regulated, thus the luminescence intensity of the blue light is improved. The luminous color and luminance of the device are improved, the color of the device is closer to white light and the brightness of the device is improved obviously.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN383.1
【参考文献】
相关期刊论文 前2条
1 王宏智;王津生;陈君;姚素薇;张卫国;;有机电致发光器件封装技术的研究进展[J];电镀与涂饰;2007年03期
2 高淑雅;孔祥朝;张方辉;吕磊;;有机电致发光器件薄膜封装研究进展[J];液晶与显示;2012年02期
，本文编号：2327203
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