Polymer grating imbedded organic light emitting diodes with improved out-coupling efficiency

2010 ◽  
Vol 97 (12) ◽  
pp. 123302 ◽  
Author(s):  
Ji-Hyang Jang ◽  
Min-Cheol Oh ◽  
Tae-Hoon Yoon ◽  
Jae Chang Kim
Keyword(s):  
Light Emitting Diodes ◽  
Coupling Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Polymer Grating

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

2013 ◽  
Vol 815 ◽  
pp. 142-147
Author(s):  
Rong Yan ◽  
Jun Wang ◽  
Wei Zhi Li ◽  
Chong Wang
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Structural Parameters ◽  
Coupling Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Inverted Pyramid ◽  
Substrate Structure ◽  
Organic Light

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.

scholarly journals Nanoslot metasurface design and characterization for enhanced organic light-emitting diodes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kyungnam Kang ◽  
Seongmin Im ◽  
Changhun Lee ◽  
Jungho Kim ◽  
Donghyun Kim
Keyword(s):  
Light Emitting Diodes ◽  
Structural Parameters ◽  
Contrast Ratio ◽  
Coupling Efficiency ◽  
Metal Structure ◽  
Organic Light Emitting Diodes ◽  
Radiation Mode ◽  
Light Emitting ◽  
Output Performance ◽  
Organic Light

AbstractWe investigate bottom-emitting organic light-emitting diodes (B-OLEDs) integrated with metasurface (MS) to analyze the effect of the structural parameters on the output performance. The performance of the MS-integrated B-OLED (MIB-OLED) is evaluated by out-coupling efficiency (OCE) and reflection of the ambient light, while attention is paid mainly to dielectric capping and metal structure of MS that may influence excitation of surface plasmon (SP). The results suggest that layer thicknesses affect the performance by as much as 10% for the OCE and up to 32% for reflectance. The OCE is in general weakly affected by the structural parameters of MS. In contrast, the reflectance characteristics are found to be dominated by localized SP that is largely determined by the length and the width of a unit slot of MS. An optimization factor introduced to evaluate the performance based on out-coupling power to the radiation mode and reflectance of MIB-OLEDs confirms that integration with MS improves performance by 16% over conventional planar structure. In particular, MIB-OLED is found to enhance OCE by 51% with Lambertian-like pattern. Enhanced performance is experimentally confirmed. The findings provide insights on how to optimize the MS structure to produce MIB-OLEDs with enhanced out-coupled power and contrast ratio.

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