【作者】 吴晓明；

【导师】 华玉林；

【作者基本信息】 天津理工大学 ， 凝聚态物理， 2003， 硕士

【摘要】 近年来，平板显示已成为显示技术的发展主流，其中有机薄膜电致发光器件（OLED）已成为众多平板显示技术中非常有实力的竞争者，它具有其它平板显示技术无法比拟的优势。虽然OLED技术日趋成熟，但是仍然存在一些尚未解决的问题，这些问题使得OLED距离商品化和实用化还有一定的距离。本文针对OLED尚未解决的某些关键问题，从原理上分析了影响OLED发光性能及量子效率的各种因素，首先建立了一套OLED量子效率测量系统，而后制备了不同类型的OLED器件，并应用本测量系统对不同的器件进行测量，通过对测量结果的仔细分析，针对不同类型的器件找出了提高OLED量子效率及发光性能的有效途径。一考虑到提高有机电致发光器件量子效率的前提是精确测得OLED器件的量子效率值，为此设计与组建了一套精确测量有机电致发光器件量子效率的测量系统（其中主要部件采用美国Keithley公司的产品）。然后利用本测量系统对以MEH-PPV为基质的橙红色OLED器件进行了测量，得出了器件的发光性能及量子效率值，此结果与有关的报道十分相近。二制备了结构为ITO／MEH-PPV／Al的单层有机电致发光器件，并应用本测量系统对器件进行了测量。为了能够提高器件的量子效率和发光性能，我们从发光材料与金属背电极的能级匹配问题上依据载流子的注入平衡条件，找出了解决问题的关键所在，并制备了ITO／MEH-PPV／Ca／Al的单层有机电致发光器件。测量的结果表明，器件的量子效率和发光性能有了显著的提高。三对一种新型的金属螯合物小分子材料L₁AgClO₄的电致发光性能进行了探索性的研究，制备了结构为ITO／L₁AgClO₄／Al的单层器件，并应用本测量系统对其进行测量。经过对测量结果以及器件制备工艺的研究，我们从材料的成膜性和载流子传输特性找到了突破口，引入了带有空穴传输特性的PVK材料，并提出利用混合型（PVK∶L₁AgClO₄）材料来提高L₁AgClO₄的成膜性以及器件的量子效率和发光性能。而后制备了结构为ITO／PVK∶L₁AgClO₄／Al的混合型单层OLED器件，经测量，所得出的结果与我们提出的思想吻合得很好。更多还原

【Abstract】 Recently the organic light-emitting diodes （OLED） provided with excellent performance has become a predominant contestant in most flat display technology. Although the OLED technology has been well developed, some luminescent performance of it, such as life-time, quantum efficiency etc, is not ideal which restrict its practicability. All factors that affected the luminescent performance of OLED were analyzed in this paper. We have designed and established a measurement system which can measure various OLED’s quantum efficiency value and found some available methods to enhance the quantum efficiency value and luminescent performance of OLED .1. On account of enhancing OLED’s quantum efficiency must be the basic precondition which imposed by accurately measuring device’s quantum efficiency , therefore , we have designed and established an quantum efficiency measurement system mainly composed by a series of components which produced by Keithley Corporation. Furthermore, in order to prove the availability of this measurement system, we have applied the system to measuring a sample device which contains MEH-PPV with orange light emitting. The results we got accords to relevant reports perfectly.2. We applied the quantum efficiency measurement system to test the OLED cell which has a three-layer structure [ITO/MEH-PPV/A1]. According to the measurement results, we found the key point by studying the matching of energy levels and balance injection of carriers. As a result, Ca was used as the cathode of OLED cell [ITO/MEH-PPV/Ca/Al] whose quantum efficiency value and luminescent performance were enhanced greatly.3. Some pilot study has been carried through on the electroluminescent characteristics of a new chelate-metal complex L₁AgClO₄ in primary content of the fifth chapter. And, we applied the quantum efficiency measurement system to test the OLED cell which has a three-layer structure [ITO/L₁AgClO₄/Al]. After analyzing the measurement results and fabrication technics,we made a breakthrough at film-formation and carriers transport characteristics. In the blend-layer OLED, PVK plays a important role in enhancing quantum efficiency value and luminescence performance of OLED cell which has a three-layer structure [ITO/ PVK: L₁AgClO₄/Al]. Finally we concluded the measurement results according to with our prediction.更多还原