Abstract
The white light emitting diode based on small molecules, which have double emitting layers, was fabricated by combining a solution process and a vacuum deposition process. The organic light emitting diode that we have prepared utilizes a three phosphorescent guest materials, iridium(III)bis(4′,6′-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate, fac tris(2-phenylpyridine) iridium (III) and tris[1-phenylisoquinolinato-C2, N] iridium (III), exhibits a high color rendering index of over 82. Despite its ease of fabrication, the peak power efficiency was about 16 lm/W. The high efficiency was attributed to the distribution of the emitting region over the two emitting layers, which is caused by energy transfer between the phosphorescent guests.
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