基于激发态内质子转移的聚集发光化合物二元互补色单发光层WOLED的研究

发布时间：2018-03-19 01:31

本文选题：白光　切入点：单发光层　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：白光有机电致发光器件因其在平面固态光源以及全彩色显示技术方面有着巨大的潜力,商业化前景非常诱人,已经引起了世人的广泛兴趣。在实现白光器件的方法中,单发光层器件是一个相对简单的方案。然而,此方法通常伴随着需要精确控制从高能发光组份向低能发光组份的能量传递程度的难题,能量传递的程度过高或过低都不能得到理想的白光。此外,大多数有机材料在在聚集态时通常会呈现发光效率降低甚至不发光的现象。因此,通常需要将发光材料掺杂在一个能级匹配的主体材料中,这就进一步导致了器件结构的复杂化和生产成本的增加。为了解决以上提出的所有问题,一个可行的方案是选取具有固态强发光,并且高能组分和低能组分之间不发生能量传递的互补色分子,制备出非能量传递型二元互补色单发光层白光器件。首先,本文筛选出两个具有聚集诱导发光特性且含有激发态内质子转移基团的黄色荧光材料(T4TB与T4AC)作为低能发光组份,然后从互补色及能量匹配的原则出发,筛选出三个蓝色荧光材料(O3TB、BMe与1,8-D)。接着对其进行两两组合,配制了不同比例的旋涂薄膜,测试了其发光光谱,并给出了这些旋涂薄膜的瞬态荧光寿命,证明了黄色、蓝色荧光材料之间的能量传递几乎被完全抑制,给我们制备WOLED提供了基础。最后,设计了以下的器件结构:ITO/NPB(50 nm)/Blue:Yellow(30 nm)/Alq3(20 nm)/LiF(1 nm)/Al(100 nm),通过对发光层中互补色材料比例的不断探索与调节,成功制备出了六组理想的六组高效率、色稳定性佳的白光器件。其中,基于BMe:T4TB=6:1的白光器件,在4-12 V的驱动电压范围下,发光颜色几乎没有任何漂移,CIE变化仅为(0.303±0.005,0.345±0.008)。
[Abstract]:White light organic electroluminescent devices have great potential in planar solid-state light source and full-color display technology, and the commercial prospect is very attractive, which has aroused wide interest in the world. Monoluminescent devices are a relatively simple solution. However, this method is often accompanied by the need to accurately control the degree of energy transfer from high-energy luminous components to low-energy luminous components. The energy transfer is too high or too low to get the ideal white light. In addition, most organic materials usually exhibit low or even non-luminous luminescence in the aggregate state. It is usually necessary to doping luminescent materials into a host material with a matching energy level, which further complicates the structure of the device and increases the cost of production. One feasible scheme is to produce non-energy-transfer binary complementary monochromatic white light devices by selecting complementary color molecules with strong solid-state luminescence and no energy transfer between high-energy components and low-energy components. In this paper, two yellow fluorescent materials, T4TB and T4AC, which have agglomeration induced luminescence and contain proton transfer groups in excited states, are selected as low energy luminescent components, and then based on the principle of complementary color and energy matching, Three blue fluorescent materials, O _ 3T _ B _ B _ (BMe) and 1H _ (8-D), were screened out. Then, different proportion of spin-coating films were prepared, their luminescence spectra were tested, and the transient fluorescence lifetime of these thin films was given, which proved that they were yellow. The energy transfer between blue fluorescent materials is almost completely suppressed, which provides the basis for the preparation of WOLED. Finally, we design the following device structure: 1 / ITO / NPB ~ (50) nm)/Blue:Yellow(30 nm)/Alq3(20 nm)/LiF(1 nm)/Al(100 NMU, by continuously exploring and adjusting the proportion of complementary color materials in the luminescent layer. Six groups of ideal white light devices with high efficiency and good color stability have been successfully fabricated. Among them, the white light devices based on BMe:T4TB=6:1 have almost no drift in the driving voltage range of 4-12 V, only 0.303 卤0.005N 0.345 卤0.008 渭 m.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN383.1

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