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Blue mixed host organic light emitting devices

机译:蓝色混合主体有机发光器件

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摘要

The lifetime is one of the main issues in the development of organic light-emitting devices (OLEDs). In this paper, we present a new OLED with an emitting layer (EML) based on a blue mixed-host (MH) structure. Compared to the conventional host-dopant system, the MH structure consists of two different hosts and one-dopant materials. Using the structure with different host ratio and fixed dopant concentration, the Commission International de L'Eclairage (CIE 1931) coordinates will shift from (0.17, 0.32) to (0.15, 0.22). The operating lifetime of optimal device is much improved over the heterostructure OLEDs, which shows the lifetime of approximately 110 h with initial luminance of 10 000 cd/m~2. The luminance reaches 80 370 cd/m~2 at 10 V, which corresponds to a luminous efficiency of 1.8 cd/A. The significant improvement in device lifetime is attributed to the elimination of the heterojunction interface and the prevention to the formation of fluorescence quenchers. These results demonstrate that the MH structure can extend lifetime without significantly changing the EML with common host material.
机译:寿命是有机发光器件(OLED)开发中的主要问题之一。在本文中,我们提出了一种具有基于蓝色混合主体(MH)结构的发光层(EML)的新型OLED。与常规的主体-掺杂剂系统相比,MH结构由两种不同的主体和一种掺杂剂材料组成。使用具有不同主体比率和固定掺杂剂浓度的结构,国际照明委员会(CIE 1931)的坐标将从(0.17,0.32)变为(0.15,0.22)。与异质结构OLED相比,最佳器件的工作寿命大大提高,在初始亮度为10000 cd / m〜2时,其使用寿命约为110 h。亮度在10 V时达到80 370 cd / m〜2,对应的发光效率为1.8 cd / A。器件寿命的显着提高归因于消除了异质结界面并防止了荧光猝灭剂的形成。这些结果表明,MH结构可以延长使用寿命,而不会显着改变普通基质材料的EML。

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