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|Type of Document
||Study of organic light-emitting diodes with internal light|
|Date of Defense
internal light extraction
||In this study, we fabricated organic light-emitting diodes (OLEDs) with internal light extraction structure to reduce the Waveguide mode loss and increase the EQE by using the Anti-Reflection (AR) and Photonic Quasi Crystals (PQC) micro-structure substrate provided by ITRI. |
The study was divided into three stages:
1. The transmittance and morphology of AR and PQC were measured and studied.
2. Light-curable polymer spin coated onto AR and PQC substrates respectively to filled the structure, and then Indium Tin Oxide (ITO) were sputter-deposited. The transmittance, morphology and sheet resistance of the AR and PQC substrates covered by Light-curable polymer and ITO were measured and studied. And then, design and fabrication of ITO anodes were performed.
3. The optimized standard green and blue OLED device structures were chosen to fabricate green and blue OLEDs with internal light extraction structure. The opto-electrical properties of the devices were measured and studied.
Finally, we successfully fabricated green OLEDs with AR structure and blue OLEDs with PQC structure respectively. Significantly, the green and blue OLEDs with internal light extraction structure have outstanding light extraction efficiency, which increase the external quantum efficiency (EQE) by 18.9% and 30.6% compared to standard OLEDs at 1000cd/m2 respectively.
Key words： internal light extraction, EQE,OLED
||Wen-yao Huang - chair|
Shun-Wei Liu - co-chair
Chih-Chien Lee - co-chair
Mei-Ying Chang - advisor
Indicate in-campus at 99 year and off-campus access at 99 year.|
|Date of Submission