Nonlinear electro-thermal modeling and field-simulation of OLEDs for lighting applications I: Algorithmic fundamentals

  • Authors:

  • LáSzló Pohl;Ern KolláR;AndráS Poppe;Zsolt KoháRi

  • Affiliations:

  • Department of Electron Devices, Budapest University of Technology and Economics, Magyar Tudósok Körútja 2, Budapest H-1117, Hungary;Department of Electron Devices, Budapest University of Technology and Economics, Magyar Tudósok Körútja 2, Budapest H-1117, Hungary;Department of Electron Devices, Budapest University of Technology and Economics, Magyar Tudósok Körútja 2, Budapest H-1117, Hungary;Department of Electron Devices, Budapest University of Technology and Economics, Magyar Tudósok Körútja 2, Budapest H-1117, Hungary

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2012

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Abstract

Large area OLEDs aimed at lighting applications should provide homogeneous luminance-homogeneity is one of the quality metrics of such devices. Local light generation depends on both the local temperature and the local voltage drop across the light emitting polymer(s) in the device. Therefore the thermal and electrical engineering of OLEDs aimed at lighting applications is critical. Due to the large area of these devices the coupled electrical and the thermal simulation problem is of distributed nature. Electrical characteristics of organic semiconductor materials used in OLED devices are highly nonlinear, and their nonlinear temperature-dependence is significant. In our present approach to distributed electro-thermal field simulation we address special needs of OLEDs, which is not yet the case with widely used, commercially available simulation tools. In this paper we present the latest version of our SUNRED electro-thermal field solver algorithm capable of handling coupled, non-linear electro-thermal problems. The new features of the algorithm are demonstrated by modeling some research OLED samples available to us in the Fast2Light project-this way simulation results are compared against measured data.