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Instability Origin and Improvement Scheme of Facial Alq3 for Blue OLED Application |
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| Authors: | DU Jiaren WANG Moran CHEN Nianke XIE Shengyi YU Hongmei WU Qi |
| Institution: | 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China; 2. Center for High Pressure Science and Technology Advanced Research, Changchun 130012, P. R. China; 3. College of Computer Science and Technology, Jilin University, Changchun 130012, P. R. China |
| Abstract: | Degradation phenomenon and poor stability of tris(8-hydroxyquinoline) aluminum(III)(Alq3)-based organic light-emitting diodes(OLEDs) have attracted much attention. In this paper, we discussed the origin of instability of the facial Alq3-based blue luminescent OLEDs with the help of first-principles calculation. The results show that environmental humidity seriously affects the luminescence stability of Alq3-based OLEDs. H2O molecules in environment can be firmly bound to the oxygen atoms of the facial Alq3, which then act as starting points for further degradation of Alq3. Moreover, the interactions between facial Alq3 and different cathode metal layers were investigated to explain the experiment phenomenon. A design guideline for diminishing the strong attraction from oxygen atoms can be proposed to protect Alq3 and improve the stability of materials applied in OLEDs. |
| Keywords: | Organic light-emitting diode(OLED) Facial tris(8-hydroxyquinoline) aluminum(III)(Alq3) First-principle calculation Degradation mechanism |
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