Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (9): 1780-1786.doi: 10.3866/PKU.WHXB201507151

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

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)

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

MSC2000: 

  • O644