[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 5, pp.446-451

ISSN: 2508-5107 (Online)

Print publication date 15 Oct 2018

Received 27 Aug 2018 Revised 13 Sep 2018 Accepted 17 Sep 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.5.446

전 용액 제조기법에 의한 고분자 발광 다이오드

고평삼^a ; Nguyen Dang Thuan^a ; 권신^b ; 우규희^b ; 이택민^b ; Zhaoyang Zhong^b ; 윤홍석^a^{, *}

All Solution-Processed Polymer Light-Emitting Diodes

Pyeongsam Ko^a ; Nguyen Dang Thuan^a ; Sin Kwon^b ; Kyoohee Woo^b ; Taikmin Lee^b ; Zhaoyang Zhong^b ; Hongseok Youn^a^{, *}

aDepartment of Mechanical Engineering, Hanbat National University, 125, Dongseodae-ro, Yuseong-gu, Daejeon 34158, Korea
bDepartment of Printed Electronics, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Korea

Correspondence to: ^*Tel.: +82-42-821-1079 Fax: +82-42-821-1587 E-mail address: hsyoun@hanbat.ac.kr (Hongseok Youn).

Abstract

Polymer light-emitting diodes (PLEDs) have great potential toward next generation light source because of their flexibility, facile fabrication, and simple structure. However, the fabrication of low-cost PLEDs is still quite challenging, owing to the vulnerability of cathode and electron injection/transportation materials against the oxygen and moisture in the air. In this paper, we propose an all solution-processable polymer light-emitting diode structure and lamination method. Generally, electrode layers are formed by vacuum deposition; however, in this study, a solution-processed Ag film was developed and used as an electrode. The solution-processed Ag film was transferred to a polymer hot-melt film and then laminated onto the PLED layer. The laminated device exhibited good performances in turn-on voltage (5.0 V), brightness (2500 cd/m²) and current efficiency (0.6 cd/A), which were comparable to that of the evaporated device.

Keywords:

PLEDs (polymer light-emitting diodes), Solution process, Lamination, Silver nanoparticle

Acknowledgments

이 논문은 2015년도 한밭대학교 교내학술연구비의 지원을 받아 수행되었음.

References

Burroughes, J. H., Bradley, D. D. C., Brown, A. R., Marks, R. N., Mackay, K., Friend, R. H., Burns, P. L., Holmes, A. B., 1990, Light-Emitting Diodes Based on Conjugated Polymers, Nature, 347 539-541. [https://doi.org/10.1038/347539a0]
Shin, S., Yang, M., Guo , L. J., Youn , H., 2013, Roll‐to‐Roll Cohesive, Coated, Flexible, High‐Efficiency Polymer Light‐Emitting Diodes Utilizing ITO‐Free Polymer Anodes, Small, 9 4036-4044. [https://doi.org/10.1002/smll.201300382]
Youn, H., Jeon, K., Shin, S., Yang, M., 2012, All-Solution Blade–Slit Coated Polymer Light-Emitting Diodes, Org. Electron, 13 1470-1478. [https://doi.org/10.1016/j.orgel.2012.04.008]
Youn, H., Park, H. J., Guo, L. J., 2015, Organic Photovoltaic Cells: From Performance Improvement to Manufacturing Processes, Small, 11 2228-2246. [https://doi.org/10.1002/smll.201402883]
Youn, H., Park, H. J., Guo, L. J., 2015, Printed Nanostructures for Organic Photovoltaic Cells and Solution‐Processed Polymer Light‐ Emitting Diodes, Energy Technology, 3 340-350. [https://doi.org/10.1002/ente.201402163]
Sandstrom, A., Dam, H. F., Krebs, F. C., Edman, L., 2012, Ambient Fabrication of Flexible and Large-Area Organic Light-Emitting Devices Using Slot-Die Coating, Nature Communications, 3 1002. [https://doi.org/10.1038/ncomms2002]
Ma, W., Iyer, P. K., Gong, X., Liu, B., Moses, D., Bazan, G. C., Heeger, A. J., 2005, Water/Methanol‐Soluble Conjugated Copolymer as an Electron‐Transport Layer in Polymer Light‐Emitting Diodes, Adv. Mater., 17 274-277. [https://doi.org/10.1002/adma.200400963]
Wu, H., Huang, F., Mo, Y., Yang, W., Wang, D., Peng, J., Cao, Y., 2004, Efficient Electron Injection From a Bilayer Cathode Consisting of Aluminum and Alcohol-/Water-Soluble Conjugated Polymers, Adv. Mater., 16 1826-1830. [https://doi.org/10.1002/adma.200400067]
Youn, H., Yang, M., 2010, Solution Processed Polymer Light-Emitting Diodes Utilizing a ZnO/Organic Ionic Interlayer With Al Cathode, Appl. Phys. Lett., 97 243302. [https://doi.org/10.1063/1.3526308]
Zhang, Y., Huang, F., Chi, Y., Jen, A. K. Y., 2008, Highly Efficient White Polymer Light-Emitting Diodes Based on Nanometer-Scale Control of the Electron Injection Layer Morphology Through Solvent Processing, Adv. Mater., 20 1565-1570. [https://doi.org/10.1002/adma.200701988]
Oh, S. H., Vak, D., Na, S. I., Lee, T. W., Kim, D. Y., 2008, Water‐ Soluble Polyfluorenes as an Electron Injecting Layer in PLEDs for Extremely High Quantum Efficiency, Adv. Mater., 20 1624-1629. [https://doi.org/10.1002/adma.200702229]
Garcia, A., Brzezinski, J. Z., Nguyen, T. Q., 2009, Cationic Conjugated Polyelectrolyte Electron Injection Layers: Effect of Halide Counterions, J. Phys. Chem. C, 113 2950-2954. [https://doi.org/10.1021/jp806374s]
Park, J. H., Park, O. O., Yu, J. W., Kim, J. K. , Kim, Y. C., 2004, Effect of Polymer-Insulating Nanolayers on Electron Injection in Polymer Light-Emitting Diodes, Appl. Phys. Lett., 84 1783. [https://doi.org/10.1063/1.1667014]
Kim, K. Y., 2012, Preparation of Highly Stabilized Silver Nanopowders by the Thermal Reduction and Their Properties, Bulletin of the Korean Chemical Society, 33 3987-3992. [https://doi.org/10.5012/bkcs.2012.33.12.3987]
Park, H. S., Park, H. S., Gong, M. S., 2010, Preparation of Silver/Polystyrene Nanocomposites by Radical Polymerization Using Silver Carbamate Complex, Polymer Korea, 34 144-149. [https://doi.org/10.7317/pk.2010.34.2.144]
Kim, K. Y., 2012, Preparation of Silver Nano Powders and Properties of Their Reverse Off-Set Ink, Master Thesis, Dankook University, Republic of Korea.
Hasan, S. A. U., Youn, H., 2017, Multi-Layer Transfer and Lamination (MTL) Process Assisted by a High-Pressure Air Jet for Highly Efficient Solution-Processed Polymer Light Emitting Diodes, Nanoscale, 9 9716-9722. [https://doi.org/10.1039/C7NR01859B]
Hong, J., He, Y., 2012, Effects of Nano Sized Zinc Oxide on the Performance of PVDF Microfiltration Membranes, Desalination, 302 71-79. [https://doi.org/10.1016/j.desal.2012.07.001]