2005 Volume 78 Issue 9 Pages 1608-1611
We fabricated organic light-emitting diodes (OLED) from horse-heart cytochrome c, and measured the electroluminescence (EL) spectra, current–voltage and EL intensity–voltage characteristics. The external quantum efficiency evaluated from those characteristics was 6–8 × 10−8 at an applied voltage of 13 V. The EL spectrum shows the Soret band around 400 nm, the Q band around 500 nm, and the 690 nm band. The three bands became obscure for a sample prepared in an acidic solution (pH = 1.68) and in a basic solution (pH = 10.01). Based on the energy diagram of the /ITO/cytochrome c/Al/ junction, we considered the difference in the EL spectrum from the photoluminescence or absorption spectrum.
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