Abstract
A highly efficient white organic light emitting diode (WOLED) was fabricated and possible emission mechanisms of a WOLED configured with blue fluorescence and phosphorescent iridium complexes are proposed. The white light emitting layer is comprised of a blue fluorescent emitting layer anthracene and a green and red phosphorescent emitting layer TPBI:11% : 0.5% . The device exhibits white emission with a Commission Internationale de l’Eclairage coordinate of (, ) and the luminance and luminous efficiency was and , respectively, at . Evidence indicates that the good energy overlap between the absorption spectrum of and and the emission spectrum of TPBI results in an effective energy transfer from TPBI to and . The optimal thickness of the green and red emitting layer promotes the injection and emitting of carriers in that layer.
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