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논문 기본 정보

자료유형
학술저널
저자정보
Gunel Huseynova (Hanbat National University) Jonghee Lee (Hanbat National University) Jae-Hyun Lee (Hanbat National University) Won Mok Kim (Korea Institute of Science and Technology) Yong Hyun Kim (Pukyong National University)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.17 No.6
발행연도
2021.11
수록면
471 - 478 (8page)

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초록· 키워드

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A highly transparent nanostructured light outcoupling system integrated with a solution-processed polymer anode is proposedfor enhancing the light outcoupling of tandem white organic light-emitting diodes (OLEDs). A poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) anode with an internal outcoupling structure (IOS) was easily prepared on aglass substrate via rapid and cost-eff ective fabrication methods. The nanostructures for the IOS were constructed based onzinc tin oxide (ZTO) prepared by Zn and Sn sputtering followed by thermal annealing. The refractive index matching andinternal light scattering led to remarkably reduced waveguided and substrate modes in the OLEDs. The external quantumeffi ciency (EQE), current effi ciency (CE), and luminance effi ciency (LE) of the tandem white OLEDs fabricated using thePEDOT:PSS/IOS system were superior to those of the devices based on the conventional ITO and PEDOT:PSS electrodeswithout the IOS. With the application of the ZTO-based IOS, the tandem devices achieved EQE, CE, and LE 20.6%,42 cd/A, and 23.3 lm/W, respectively, showing a 1.4-fold EQE enhancement over that of the ITO-based device without theIOS. Moreover, the EQE of the devices increased by a factor of 2.3 upon combining the ZTO IOS with a hemispherical lensplaced on the backside of the substrate. Remarkably, the ZTO IOS-based devices exhibited outstanding white color stabilityover large viewing angles. The simple and low-cost IOS developed in this study can potentially be a practical technique forenhancing the light outcoupling effi ciency of tandem white OLEDs.

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