Out-Coupling Efficiency Improvement in Organic Light-Emitting Diodes with Inverted Pyramid Glass Substrates

Abstract:

The external quantum efficiency of organic light-emitting diodes (OLEDs) was suppressed by the wave guide mode in the glass substrate and organic layers. In this paper, a mechanism is developed to simulate the optical luminous field for OLEDs based on inverted pyramid substrate structure. Monte Carlo method was used to optimize the structural parameters to enhance the external quantum efficiency of device by changing the substrate structure. A considerable enhancement in the extraction efficiency of the OLED is expected theoretically, and near 42% out-coupling efficiency was achieved in experiment without affecting the electroluminescent spectrum.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 142-147
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.142
• Online since: October 2013
• Authors: Rong Yan, Jun Wang, Wei Zhi Li, Chong Wang
• Keywords: External Quantum Efficiency, Light out-Coupling, OLED, Substrate Modification

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