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|Type of Document
||Study of sol gel-deposited ZnO external light extraction thin films to enhance the efficiency in organic light-emitting diodes|
|Date of Defense
||Organic Light-Emitting Diodes
ZnO thin films
External light extraction
||In this study, we fabricated organic light-emitting diodes (OLEDs) with external light extraction structure to reduce the Substrate mode loss and increase the EQE by using the Sol–gel-deposited zinc oxide (ZnO) micro structure thin films. And we successfully applied the external light extraction to the organic light-emitting diodes.|
First, we use the spin-coating to fabricate the ZnO thin film for forming various thickness by using different spin rate. We investigated surface morphology and transmittance of the ZnO thin film.
Then, we anneal different temperature and also different ways to raise the annealing temperature. We investigated surface morphology and optical characteristics of the ZnO thin film, and we improve the ZnO thin film to match the condition of external light extraction structure.
Finally, we successfully fabricated blue OLEDs with the Sol–gel-deposited ZnO light extraction thin films. Significantly, the blue OLEDs with external light extraction structure have great light extraction efficiency which increase the external quantum efficiency (EQE) by 43% compared to standard OLEDs at 1000cd/m2.
||Ko-Shan Ho - chair|
Shun-Wen Liu - co-chair
Chih-Chien Lee - co-chair
Wen-Yao Huang - co-chair
Mei-Ying Chang - advisor
Indicate in-campus at 99 year and off-campus access at 99 year.|
|Date of Submission