Browse > Article
http://dx.doi.org/10.12925/jkocs.2012.29.3.12

Study on the Efficient White Organic Light-Emitting Diodes using the Material of Binaphthyl Group  

Yeo, Hyun-Ki (Dept. of Chemical & Biological Engineering, Korea University)
Publication Information
Journal of the Korean Applied Science and Technology / v.29, no.3, 2012 , pp. 459-465 More about this Journal
Abstract
We had synthesized a green dopant material based on the binaphthyl group, 7,7'-(2,2'dimethoxy-1,1'-binaphthyl-3,3'-diyl) bis(4-(thiophen -2-yl) benzo[e][1,2,5] thiadiazole (TBT). We also fabricated the white organic light emitting diode (OLED) with a phosphorescent blue emitter : iridium(III)bis[(4,6-di-fluoropheny)-pyridinato -N,C2]picolinate (FIrpic) doped in N,N'-dicarbazolyl-3,5-benzene (mCP) of hole transport type host material and both TBT and bis(2-phenylquinolinato)- acetylacetonate iridium(III) (Ir(pq)2acac) doped in 1,3,5-tris(N-phenylbenzimidazole -2-yl)benzene (TPBi) of electron transport type host material. As a result, the property of white OLED using TBT, which demonstrated a maximum luminous efficiency and external quantum efficiency of 5.94 cd/A and 3.23 %, respectively. It also showed the pure white emission with Commission Internationale de I'Eclairage (CIE) coordinates of (0.34, 0.36) at 1000 nit.
Keywords
TBT; Organic Light Emitting Diode; White OLED;
Citations & Related Records
연도 인용수 순위
  • Reference
1 K. E. Zimeles, A. T. Hussaim, D. D. C. Bradely, A. R. Marks, and G. Wegner, Optical Spectroscopy of Field-induced Charge in Poly(3-hexyl thienylene) Metal-insulator-semiconductor Structures: Evidence for polarons, Phys. Rev. Lett. 66, 2231 (1991).
2 S. Chichibu, T. Azuhata, T. Sota and S. Nakamura, Spontaneous Emission of Localized Excitons in InGaN Single and Multiquantum well Structures, Appl. Phys. Lett. , 69, 4188 (1996).
3 J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, et al,, Light-emitting Diodes Based on Conjugated Polymers, Nature, 347, 539 (1990).
4 M. Pope, H. P. Kallmann, and P. Magnante, Electroluminescence in Organic Crystals, J. Chem. Phys. 38, 2042 (1963).
5 W. Helfrich and W. G. Schneider, Recombination Radiation in Anthracene Crystals, Phys. Rev. Lett. 14, 229 (1965).
6 "Strusture and Method of Fabricating Organic Devices" U. S. Patent No. 6982179.
7 S. A. Van Slyke, C. H. Chen, and C. W. Tang, Organic Electroluminescent Devices with Improved Stability. Appl. Phys. Lett. 69, 2160 (1996).
8 L. S. Hung, C. W. Tang, and M. G. Mason, Enhanced Electron Injection in Organic Electroluminescence Devices Sing an Al / LiF electrode. Appl. Phys. Lett, 70 152 (1997).
9 M. A. Baldo, D. F. O' Brien, Y. You, A. A. Shoustikov, S. Sibley, M. E. Thompson, and S. R. Forrest, Highly Efficient Phosphorescent Emission from Organic Electroluminescent Devices, Nature, 395, 151 (1998).
10 D. F. O'Brien, M. A. Baldo, M. R. Thompson, and S. R. Forrest, Improved Energy Transfer in Electrophosphorescent Devices, Appl. Phys. Lett., 74, 442 (1999).
11 Brian W. D'Andrade and Stephen R. Forrest, White Organic Light-Emitting Devices for Solid-State Lighting, Adv. Mater., 16, 1585 (2004).
12 B. W. D'Andrade, R. J. Holmes and S. R. Forrest, Efficient Organic Electrophosphorescent White-Light- Emitting Device with a Triple Doped Emissive Layer, Adv. Mater., 16, 624 (2004).
13 Yi Zhou, Qingguo He, Yi Yang, Haizheng Zhong, Chang He, Guangyi Sang, Wei Liu, Chunhe Yang, Fenglian Bai and Yongfang Li, Binaphthyl-Containing Green- and Red-Emitting Molecules for Solution-Processable Organic Light- Emitting Diodes, Advanced Functional Materials. 18, 3299 (2008).
14 K. B. Simonsen, K. V. Gothelf, and K. A. J-gensen, A Simple Synthetic Approach to 3,3'-Diaryl BINOLs, J. Org. Chem., 63, 7536 (1998).
15 F. Huang, L. T. Hou, H. L. Shen, J. X. Jiang, F. Wang, H. Y. Zhen, and Y. Cao, Synthesis, Photophysics, and Electroluminescence of High-efficiency Saturated Red Light-emitting Polyfluorene-based Polyelectrolytes and Their Neutral Precursors, J. Mater. Chem., 15, 2499 (2005).