Effect of energy transfer on electroluminescent performance in blend-layer organic light-emitting devices

The photo- and electroluminescence properties of the blend films of Alq3 and MEH-PPV with various weight ratios are studied. The Förster energy transfer with a relatively large Förster radius (46.9 Å) and governs the device luminescent performance, although there are some effect of phase separation. It is found that the energy transfer process governs not only the PL properties in the blend films but also the EL performance of the blend-layer OLEDs.