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Optical Modulation Characteristics of Red Organic Light Emitting Diodes for the Application on the Electro-optical Conversion Device

전기-광 변환소자 응용을 위한 적색 유기 EL 소자의 광변조 특성

  • Published : 2005.06.01

Abstract

We fabricated red organic light emitting diodes(OLEDs) utilizing tis(8-hydroxyquinoline) aluminum $(Alq_3)$ doped with $5\%$ of (4-(dicyanomethylene)-2-i-propyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran) (DCJTI) and investigated the driving and modulation characteristics for applying to the electro-optical conversion device. To improve the driving characteristics of red OLEDs, 3 V of offset voltage, which is equal to the turn on voltage, Is applied to the device. Offset voltage enhanced the optical EL output and reduced the rise time of EL waveforms of red OLEDs, and hence the cutoff frequency is increased with increasing applied voltage. The optical pulse of 100 MHz has been obtained from red OLEDs. Therefore, we confirmed that the red OLEDs can be applied to the fields of optical communication as an electro-optical conversion device.

References

  1. P. Modak, D. Delbeke, I. Moerman, R. Baets, P. Van Daele, and P. Demeester, 'InAlGaP microcavity LEDs on Ge-substrates', J. Crystal Growth, Vol. 221, p. 668, 2000
  2. 김주승, 김종욱, 구할본, 'Exciplex를 이용한 백색 전계발광소자의 발광특성', 전기전자재료학회논문지, 14권, 9호, p. 762, 2001
  3. C. W. Tang and S. A. Vanslyke, 'Organic electroluminescent diodes', Appl, Phys, Lett., Vol. 51, No. 12, p. 913, 1987
  4. Y. Ohmori, H. Kajii, T. Sawatan, H. Veta and K. Yoshino, 'Enhancement of electroluminescence utilizing confined energy transfer for red emission', Thin Solid Films, Vol. 399, p. 407, 2001
  5. 김주승, 구할본, 'Poly(3-hexylthiophene)의 PL 발광 메카니즘에 관한 연구', 전기전자재료학회논문지, 14권,2호, p. 133, 2001
  6. Y. Ohmori, H. Kajii, T. Sawatan, H. Veta 'Realization of polymeric optical intergrated devices utilizing organic light-emitting diodes and photodetectors fabricated on a polymeric waveguide', IEEE J. Selected Topics in Quantum Electronics, Vol. 10, No. 1, p. 70, 2004
  7. H. Kajii and Y. Ohmori, 'Transient properties of organic electroluminescent diode using 8-hydroxyquinoline aluminum doped with rubrene as an electro-optical, conversion device for polumeric integrated devices', Jpn. J. Appl, Phys., Part 1, No. 41, p. 2746, 2002
  8. C. W. Chang, Y. T. Kao, and E. W. G. Diau, 'Fluorescence lifetime and nonradiative relxation dynamics of DCM in nonpolar solvent', Chem. Phys. Lett., Vol. 374, p.110, 2003
  9. S. Tokita, H. Tanaka, K. Noda, A. Okada, and Y. Taga, 'Thermal stability oligomeric tripheny llamine/tris (8-quinolinolato) aluminum electroluminescent devices', Appl. Phys. Lett. 70, p. 1929, 1997 https://doi.org/10.1063/1.118782
  10. J. S. Kim, B. Y. Seo, and H. B. Gu, 'Exciplex emission and energy transfer in white light-emitting organic electroluminescent device', Synth. Met., Vol. 132, p. 285, 2003
  11. W. Brutting. H. Riel, T. Beierlein, and W. Riess, 'Influence of trapped and interfacial charges in organic multilayer light-emitting devices', J. Appl. Phys., Vol. 89, p. 1704, 2001