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Combinatorial Development of Blue OLEDs Based on Star Shaped Molecules

机译：基于星形分子的蓝色OLED的组合开发

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In this paper we describe the use of combinatorial vapor deposition techniques for the optimization of blue organic light emitting diodes (OLEDs). In these devices the star shaped molecule 1 with a triphenylamine core and three fluorene side groups serves as hole transport and emitting layer. Compound 2 with a much lower lying HOMO and a larger bandgap is used as hole blocking layer. Using combinatorial vapor deposition 42 OLEDs with thickness gradients of both the hole transport and the hole blocking layer have been simultaneously prepared on one substrate. The physical characterization of the devices clearly shows that a hole blocking layer of the star shaped molecule 2 is necessary in order to obtain pure blue emission with CIE coordinates of x = 0.15 and y = 0.15. A thickness of only 5 nm of the blocking layer is sufficient, and with increasing layer thickness the brightness of the blue devices drops. The blue devices exhibit a brightness of 400 cdm~(-2) and a luminous efficiency of 2 cd A~(-1). The thickness variations of both the hole transport and the hole blocking layer have been made in one combinatorial evaporation experiment on a single substrate using a set of movable masks. This demonstrates how efficient combinatorial methods can be used for the development of OLEDs.
机译：在本文中，我们描述了使用组合气相沉积技术优化蓝色有机发光二极管（OLED）的方法。在这些装置中，具有三苯胺核心和三个芴侧基的星形分子1用作空穴传输和发射层。具有较低的HOMO和较大的带隙的化合物2用作空穴阻挡层。使用组合气相沉积，已经在一个基板上同时制备了具有空穴传输层和空穴阻挡层的厚度梯度的42种OLED。器件的物理特征清楚地表明，为了获得CIE坐标x = 0.15和y = 0.15的纯蓝色发射，星形分子2的空穴阻挡层是必需的。仅5nm的阻挡层的厚度是足够的，并且随着层厚度的增加，蓝色器件的亮度下降。蓝色器件的亮度为400 cdm〜（-2），发光效率为2 cd A〜（-1）。空穴传输层和空穴阻挡层的厚度变化是在一个组合蒸发实验中使用一组可移动的掩模在单个基板上进行的。这证明了如何有效的组合方法可用于OLED的开发。

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