Browse > Article

Optimization of Mg:Ag Cathodes and Effect of LiF Electron Injection Layer on the Characteristics of Top Emission Organic Light Emitting Diodes  

Song, Min Seok (Department of Electronic Engineering, Gachon University)
Kwon, Sang Jik (Department of Electronic Engineering, Gachon University)
Cho, Eou-Sik (Department of Electronic Engineering, Gachon University)
Publication Information
Journal of the Semiconductor & Display Technology / v.21, no.1, 2022 , pp. 71-74 More about this Journal
Abstract
For the process simplification in the fabrication of organic light emitting diode(OLED), top emission OLED (TEOLED) was fabricated without lithium fluoride(LiF) used as an electron injection layer (EIL). After co-deposition of Mg and Ag with a different process conditions, a cathode material adjacent to EIL was optimized when Mg and Ag have a ratio of 1:9 considering sheet resistance and transmittance. From the energy band diagram of TEOLED, band gap difference between Trisaluminium (Alq3) and Mg:Ag cathode show the difference of 0.4 eV according to the usage of LiF The fabricated TEOLED without LiF showed the improvement of 5.2 % and 2.7 % in the luminance and the current density comparing that with LiF. The results show there is no significant difference in OLED characteristics regardless of LIF layer in the TEOLED structures.
Keywords
Top emission organic light emitting diode(OLED); lithium fluoride(LiF); cathode; energy band diagram; luminance; current density;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J.-M. Lee, C. H. Kang, J. S. Yoo, H. W. Hwang, S. K. Hong, Y. M Ha, and B.-K. Ju, "Analysis and simulation of reddish overshoot in active matrix organic light-emitting diode display with varying p-doped hole transport layer concentrations ", Org. Electron., Vol. 99, p106328, 2021.   DOI
2 W. Ren, K. R. Son, T. H. Park, V. Murugadoss, and T. G. Kim, "Manipulation of blue TADF top-emission OLEDs by the first-order optical cavity design: toward a highly pure blue emission and balanced charge transport", Photonics Research, Vol. 9, pp1502-1512, 2021   DOI
3 G.-R. Chen, J. Duan, S. Liu, G.-W. Yue, and M. Qian, "Optical calculation of transparency of Ag film cathode in top-emitting OLED applicatio", Comp. Mater. Sci,, Vol. 203, p111038, 2022.   DOI
4 X. Zheng, Y. Liu, Y. Zhu, F. Ma, C. Feng, Y. Yu, H. Hu, and F. Li, "Efficient inkjet-printed blue OLED with boosted charge transport using host doping for application in pixelated display", Opt. Mater., Vol. 101, p109755, 2020.   DOI
5 K. Dhbaibi, L. Abella, S. Meunier-Della-Gatta, T. Roisnel, N. Vanthuyne, B. Jamoussi, G. Pieters, B. Racine, E. Quesnel, J. Autschbach, J. Crassous, and L. Favereau, "Achieving high circularly polarized luminescence with push-pull helicenic systems : from rationalized design to top-emission CP-OLED applications", Chem. Sci., Vol. 12, pp5522-5533, 2021.   DOI
6 S. Shin, H. W. Yoon, Y. Jang, and M. Hong, "Stoichiometric silicon nitride thin films for gas barrier, with applications to flexible and stretchable OLED encapsulation", Appl. Phys. Lett., Vol. 118, p181901, 2021.   DOI
7 J.-H. Oh and J.-W. Park, "Designing a solution-processable electron transport layer for transparent organic light-emitting diode", Org. Electron., Vol. 96, p106252, 2021.   DOI
8 W. S. Cho, J. Y. Park, S. Baek, C. S. Choi, S.-H. Cho, K. Hong, and J.-L. Lee, "Completely Hazy and Transparent Films by Embedding Air Gaps for Elimination of Angular Color Shift in Organic Light-Emitting Diodes", ACS Appl. Mater. Interfaces., Vol. 13, pp39660-39670, 2021.   DOI
9 D.-G. Moon, "Vacuum thermal evaporated transparent cathodes for organic light-emitting devices", Vacuum Magazine, Vol. 1, pp19-23, 2014 https://doi.org/10.5757/vacmag.1.2.19   DOI
10 X. Chen, D. Wu, J. Wang, Y. Zhou, Z. Zhang, C. Li, J. Zhang, P. Chen, and Y. Duan, " A highly transparent laminated composite cathode for organic light-emitting diodes", Appl. Phys. Lett. Vol. 119, p073301, 2021.   DOI
11 J. T. Lim, C. H. Jeong, J. H. Lee, G. Y. Yeom, E.-C. Shin, E. H. Lee, and T. W. Kim, "High-Luminance Top-Emitting Organic Light- Emitting Diodes Using Cs/Al/Au as the Semitransparent Multimetal Cathode" Journal of The Electrochemical Society, Vol. 154, pp.J302-J305, 2007   DOI
12 X. Chen, D. Wu, J. Wang, Y. Zhou, Z. Zhang, C. Li, J. Zhang, P. Chen, and Y. Duan, "A highly transparent laminated composite cathode for organic light-emitting diodes" Appl. Phys. Lett. Vol. 119, 073301, 2021   DOI