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Study on the Emission Properties of Visible Light Source using Energy Transfer

에너지전달을 이용한 가시광 Light Source의 발광특성에 관한 연구

  • Published : 2004.11.01

Abstract

Red organic electroluminescent (EL) devices based on tris(8-hydroxyquinorine aluminum) (Alq$_3$) doped with red emissive materials, 4-(dicyanomethylene)-2-t-butyl -6-(l,1,7,7-tetramethyljulolidyl-9-enyl)4H-pyran (DCJTB). poly(3-hexylthiophene) (P3HT). rubrene and 4-dicyanomethylene-2-methyl-6[2-(2,3.6.7-tetrahydro-lH,5H-benzo-[i,j]quinolizin-8yl)vinyl]-4H-pyran (DCM2) were fabricated for applying to the red light source, The photoluminescence (pL) intensities of red emissive materials doped in Alq$_3$ are limited by the concentration quenching with increasing the doping ratio and the doping concentration of DCJTB, DCM2, P3HT and rubrene measured at the maximum intensity showed 5, 1, 0.5 and 2 wt%, respectively. Time-resolved PL dynamic results showed that the PL lifetime of red emissive materials doped in Alq$_3$ were increased more than the value of material itself. It means that the efficient energy transfer occurred in the mixed state and Alq$_3$ is a suitable host materials for red emissive materials, The device which was used DCJTB as a dopant achieved the best result of the maximum luminance of 594 cd/$m^2$ at 15 V and showed the chromaticity coordinates of x=0,624, y=0,371.

Keywords

References

  1. X. Y. Zheng, W. Q. Zhu, Y. Z. Wu, X. Y. Jiang, R. G. Sun, Z. L. Zhang, and S. H. Xu, 'A white OLED based on DPVBi blue light emitting host and DCJTB red dopant', Displays, Vol. 24, p. 121, 2003 https://doi.org/10.1016/j.displa.2003.09.004
  2. 김주승, 김종욱, 구할본, 'Exciplex를 이용한 백색 전계발광소자의 발광특성', 전기전자재료학회논문지, 14권, 9호, p. 762, 2001
  3. 오환술, 조재영, 최성진, 강명구, 윤석범, 'DPVBi/Rubrene 구조를 사용한 2-파장 방식의 백색유기 발광소자의 광학적, 전기적 특성에 관한 연구', 전기전자재료학회논문지, 17권, 2호, p. 217, 2004
  4. C. W. Tang and S. A. Vanslyke, 'Organic electroluminescent diodes', Appl. Phys. Lett., Vol. 51, No. 12, p. 913, 1987 https://doi.org/10.1063/1.98799
  5. Yutaka Ohmori, Hirotake Kajii, Takumi Sawatani, Hiroshi Ueta, and Katsumi Yoshino, 'Enhancement of electroluminescence utilizing confined energy transfer for red emission', Thin Solid Films, Vol. 399, p. 407, 2001
  6. T. Virgili, D. G. Lidzey, and D. D. C. Bradley, 'Red-light-emitting diodes via efficient energy transfer from poly(9,9-dioctylfluorene) to tetraphenylporphyrin', Synth. Met., Vol. 111-112, p. 203, 2000 https://doi.org/10.1016/S0379-6779(99)00347-1
  7. Andrei Shoustikov, Yujian You, Paul E. Burrows, Mark E. Thompson, and Stephene R. Forrest, 'Orange and red organic light-emitting devices using aluminum tris(5-hydroxyquinoxanline)', Synth. Met., Vol. 91, p. 217, 1997 https://doi.org/10.1016/S0379-6779(98)80034-9
  8. J. Morgado, F. Cacialli, R. H. Friend, R. Iqbal, G. Yahioglu, L. R. Milgram, S. C. Moratti, and A. B. Holmes, 'Tuning the red emission of a soluble poly(p- phenylene vinylene) upon grafting of porphyrin side groups', Chem. Phys. Lett., Vol. 325, p. 552, 2000 https://doi.org/10.1016/S0009-2614(00)00725-9
  9. W. Brutting, S. Berleb, and A. G. Muckl, 'Space-charge limited conduction with a field and temperature dependent mobility in Alq light-emitting devices', Synth, Met., Vol. 122, p. 99, 2001 https://doi.org/10.1016/S0379-6779(00)01342-4
  10. 김주승, 구할본, 'Poly(3-hexylthiophene)의 PL 발광 메카니즘에 관한 연구', 전기전자재료학회논문지, 14권, 2호, p. 133, 2001
  11. H. Nishino, G, Yu, A. J. Heeger, T. A. Chen, and R. D. Rieke, 'Electrolumineacence from blend films of poly(3-hexylthiophene) an poly(N-vinylcarbazole)', Synth. Met., Vol. 68, p. 243, 1995 https://doi.org/10.1016/0379-6779(94)02295-A
  12. T. Kobayashi, J. Hamazaki, H. Kunugita, K. Ema, T. Endo, M. Rikukawa, and K. Sanui, 'Coexistence of photoluminescence from two intrachain states in polythiophene films', Phys. Rev. B 67, p. 205, 2003