Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevB.62.11405
Title: Microstructural studies of organic light-emitting devices by Monte Carlo simulation of two-dimensional triangles
Authors: Cheng, S.-Y.
Wang, J.-S. 
Xu, G. 
Issue Date: 1-Nov-2000
Citation: Cheng, S.-Y., Wang, J.-S., Xu, G. (2000-11-01). Microstructural studies of organic light-emitting devices by Monte Carlo simulation of two-dimensional triangles. Physical Review B - Condensed Matter and Materials Physics 62 (17) : 11405-11411. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.62.11405
Abstract: The fast degradation of organic light-emitting devices (OLEDs) remains as the main obstacle to the commercialization of OLEDs. Among the failure mechanisms proposed, crystallization of the amorphous Alq3 film that leads to the quenching of electroluminescence plays a crucial role and is little understood. Because in situ studies of the Alq3 layer, with the probing of thin organic film by, for example, x-ray diffraction, are very difficult, if not impossible, Monte Carlo simulation is therefore conducted. The molecular motion of Alq3 is simulated by two-dimensional triangles which interacted with a square-well potential in an isothermal-isobaric ensemble. Simulated results show the structural relaxation of Alq3 from amorphous to crystalline upon thermal annealing. To impede this ordering process, quenched impurities of various shapes were added to the system. It is found that impurities of circular shape and of low aspect ratio have relatively the highest disordering effect. This is in good agreement with the experimental results. In addition, the preferred geometry of the Alq3 system was also examined.
Source Title: Physical Review B - Condensed Matter and Materials Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/104815
ISSN: 01631829
DOI: 10.1103/PhysRevB.62.11405
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