Browse > Article
http://dx.doi.org/10.4313/JKEM.2005.18.7.641

Fabrication of a White Organic Light Emitting Diode By Synthesizing a Novel Non-conjugated Blue Emitting Material PPPMA-co-DTPM Copolymer  

Cho, Jae-Young (건국대학교 전자공학부)
Oh, Hwan-Sool (건국대학교 전자공학부)
Kim, Tae-Gu (건국대학교 전자공학부)
Yoon, Seok-Beom (공주대학교 광응용과학)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.18, no.7, 2005 , pp. 641-646 More about this Journal
Abstract
To fabricate a single layer white organic light emitting diode (OLED), a novel non-conjugated blue emitting material PPPMA-co-DTPM copolymer was synthesized containing a perylene moiety unit with hole transporting and blue emitting ability and a triazine moiety unit with electron transporting ability. The devices were fabricated using PPPMA-co-DTPM $(PPPMA[70\;wt\%]:DTPM[30\;wt\%])$ copolymer by varying the doping concentrations of each red, green and blue fluorescent dye, by molecular-dispersing into Toluene solvent with spin coating method. In case of ITO/PPPMA-co-DTPM:TPB$(3\;mol\%):C6(0.04\;mol\%):NR(0.015\;mol\%)/Al$ structure, as they were molecular-dispersing into 30 mg/ml Toluene solvent, nearly-pure white light was obtained both (0.325, 0.339) in the CIE coordinates at 18 V and (0.335, 0.345) at 15 V. The turn-on voltage was 3 V, the light-emitting turn-on voltage was 4 V, and the maximum external quantum efficiency was $0.667\%$ at 24.5 V. Also, in case of using 40 mg/ml Toluene solvent, the CIE coordinate was (0.345, 0.342) at 20 V.
Keywords
White organic light emitting diode; Non-conjugated copolymer; PPMA; DTPM; PPPMA-co-DTPM;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. Kido, H. Shionoya, and K. Nagai, 'Single-layer white light-emitting organic electro-luminescent devices based on dye-dispersed poly(N-vinylcarbazole)', Appl, Phys. Lett., Vol. 67, No. 16, p. 2281, 1995
2 J. Y. Cho, S. J. Choi, S. B. Yoon, and H. S. Oh, 'A study on the luminous properties of the white-light-emitting organic LED with two-wavelength using $DPVBi/Alq_3:Rubrene$ structure', J. of KIEEME(in Korean), Vol. 16, No.7, p. 616, 2003
3 H. S. Oh, Y. Cho, S. J. Choi, M. K. Kang, and S. B. Yoon, 'A study on the optical and electrical properties of the white-light-emitting organic LED with two-wavelength using DPVBi/Rubrene structure', J. of KIEEME(in Korean), Vol. 17, No.2, p. 217, 2004
4 X. T. Tao, Y. D. Zhang, T. Wada, and H. Sasabe, 'Novel main-chain poly-carbazoled as hole and electron transport materials in polymer light-emitting diodes', Appl, Phys. Lett., Vol. 71, No. 14, p. 1921, 1997
5 G. G. Malliaras, J. R. Salem, P. J. Brock, and C. Scott, 'Electrical characteristics and efficiency of single-layer organic light-emitting diodes', Physical Review B, Vol. 58, No. 20, p. R13411, 1998
6 C. W. Tang and S. A. VarrSlyke, 'Organic electroluminescent diodes', Appl. Phys. Lett., Vol. 51, No. 12, p. 913, 1987
7 C. W. Tang, S. A. VanSlyke, and C. H. Chen, 'Electrolurninescence of doped organic thin films', J. Appl, Phys., Vol. 65, No.9, p. 3610, 1989