物理化学学报 >> 2015, Vol. 31 >> Issue (9): 1780-1786.doi: 10.3866/PKU.WHXB201507151

光化学和辐射化学 上一篇    下一篇

MgF2改性Alq3纳米复合材料的制备及其对OLED抗老化性能的提高

李菀丽1,2,刘晓云1,2,苗艳勤1,2,杨君礼1,2,武聪伶1,2,李源浩1,2,郭鹍鹏1,2(),王华1,2(),许并社1,2   

  1. 1 太原理工大学新材料界面科学与工程教育部重点实验室,太原030024
    2 太原理工大学新材料工程技术研究中心,太原030024
  • 收稿日期:2015-04-20 发布日期:2015-09-06
  • 基金资助:
    国家自然科学基金(61307029, 21101111, 61205179, 61307030);教育部新世纪人才计划(NCET-13-0927);科技部国际科技合作专项项目(2012DFR50460)

MgF2 Modified Alq3 Nanocomposite: Synthesis and Improvement of Anti-Aging Performance of OLED

Wan-Li. LI1,2,Xiao-Yun. LIU1,2,Yan-Qin. MIAO1,2,Jun-Li. YANG1,2,Cong-Ling. WU1,2,Yuan-Hao. LI1,2,Kun-Peng. GUO1,2(),Hua. WANG1,2(),Bing-She. XU1,2   

  1. 1 Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
    2 Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, P. R. China
  • Received:2015-04-20 Published:2015-09-06
  • Supported by:
    the National Natural Science Foundation of China(61307029, 21101111, 61205179, 61307030);New CenturyExcellent Talents in University of Ministry of Education of China(NCET-13-0927);International Science & Technology Cooperation Programof China(2012DFR50460)

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摘要：

提高有机电致发光器件(OLED)的稳定性和寿命是其市场化应用中需要解决的关键问题.本文从提高发光材料自身的稳定性出发,以Mg(CF3COO)2-x(CH3COO)x溶胶为前驱体,将其与8-羟基喹啉铝(Alq3)混合浓缩成糊状后, 300 ℃真空烧结,经过MgF2的生成和Alq3的相变后,形成了一系列Mg含量不同的具有超结构ε相的纳米复合材料Alq3-MgF2.研究结果表明,相比于纯Alq3, Alq3-MgF2纳米复合材料制备的OLED可以很好地保持Alq3的发光特性,同时,其抗老化性能得到显著提高.特别是, Mg(CH3COO)2投料量为Alq3的5% (摩尔分数)时,所得Alq3-MgF2纳米复合材料制备的器件抗老化性能最优,在空气中老化72 h,最大发光亮度仍保持在起始值的93.5%;而Alq3制备的OLED在空气中老化24 h后基本失活.

关键词: 有机电致发光器件, 纳米复合材料, Alq3-MgF2, 发光亮度, 抗老化

Abstract:

From the viewpoint of practical application, enhancing the stability and lifetime of organic lightemitting diodes (OLED) is a goal of research. A MgF2 modified tris(8-hydroxyquinoline)-aluminum (Alq3) hybrid superstructure was realized by collosol infiltration of a Mg(CF3COO)2-x(CH3COO)x precursor onto Alq3. Alq3 was well-dispersed in a large amount of Mg(CF3COO)2-x(CH3COO)x gel precursor solution, and after concentration a well-dispersed composite paste was produced. By heating the paste to 300 ℃, Alq3 transformed to the superstructured ε-phase, and MgF2 homogeneously incorporated because of good gel precursor infiltration and in situ deposition. The MgF2-modified Alq3 nanocomposite with superstructure has the same electroluminescence (EL) spectrum as Alq3, with a dramatic improvement of the anti-aging performance of the OLED compared with Alq3 because of the uniform assembly and well-defined structure. The effect of the amount of Mg(CH3COO)2 reactant on the OLED device anti-aging performance was investigated. The results showed that for the Alq3-MgF2 nanocomposite with 5% (molar fraction) of the Mg(CH3COO)2 reactant, the luminance remained at the initial state of 93.5% after aging for 72 h in air. However, the luminance of the Alq3-based OLED almost disappeared after aging for 24 h under the same conditions. This work on inorganic material modified luminescent materials makes significant progress towards stable OLED.

Key words: Organic lighting emitting diode, Nanocomposite, Alq3-MgF2, Luminescence, Anti-aging