The Light Extraction Efficiency Enhancement in Organic Light-Emitting Diodes with Substrate Modifications

2012 ◽  
Vol 605-607 ◽  
pp. 2031-2034
Author(s):  
Chong Wang ◽  
Jun Wang ◽  
Kai Yuan ◽  
Lei Yu
Keyword(s):  
Light Emitting Diodes ◽  
Extraction Efficiency ◽  
Internal Quantum Efficiency ◽  
Organic Thin Films ◽  
Organic Light Emitting Diodes ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
Organic Layers ◽  
Organic Light ◽  
The Difference

The internal quantum efficiency of organic light-emitting diodes (OLEDs) can reach values near to 100%. Due to the difference among the refractive indices of the substrate, anode, organic thin films, and the air, two wave-guiding phenomena arise in the anode/organic layers and substrate of the OLEDs. In this paper, the substrate modifications are developed to simulate the optical luminous field for OLEDs. Monte Carlo method was used to investigate enhancement of the external extraction efficiency, which is related to the total reflection inside the device by changing the structure of the substrate.

scholarly journals The Effect of Anisotropy on Light Extraction of Organic Light-Emitting Diodes with Photonic Crystal Structure

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Wei Xu ◽  
Yang Li
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Light Emitting Diodes ◽  
Extraction Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
Organic Light ◽  
Triangle Lattice

The light extraction efficiency of organic light-emitting diodes (OLED) is greatly limited due to the difference in refractive indexes between materials of OLED. We fabricated OLED with photonic crystal microstructures in the interface between the glass substrate and the ITO anode. The light extraction efficiency can be improved by utilizing photonic crystals; however, the anisotropy effect of light extraction was clearly observed in experiment. To optimize the device performance, the effect of photonic crystal on both light extraction and angular distribution was investigated using finite-difference time domain (FDTD) method. We simulated the photonic crystals with the structure of square lattice and triangle lattice. We analyzed the improvement of these structures in the light extraction efficiency of the OLED and the influence of arrangement, depth, period, and diameter on anisotropy. The optimized geometric parameters were provided, which will provide the theoretical support for designing the high performance OLED.

Dual pattern for enhancing light extraction efficiency of white organic light-emitting diodes

2018 ◽  
Vol 57 ◽  
pp. 201-205 ◽  
Author(s):  
Kwan Kim ◽  
Kyoung-Hoon Han ◽  
Yang-Doo Kim ◽  
Daihong Huh ◽  
Yoonjay Han ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Extraction Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
Organic Light
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