External quantum efficiency Forster energy transfer

By using metal as the capping layer, SPPs have been demonstrated as an effective means for increasing the external quantum efficiency of ZnO. The use of thin spacer and metal alloy can eliminate the unwanted Forster energy transfer and support on-resonance SPP coupling. In addition, nanocrystalline Au can on one hand suppress the deep-level emission while on the other hand increase the band-edge emission of ZnO. Finally, the radiative SPP arising from MIM can be used to increase the forward emission of ZnO. 

Therefore, the different complexes affect the external quantum efficiency of dye doped organic light-emitting diodes. This arises, because the efficiency of Forster energy transfer from the matrix to the dye is dependent on the degree of overlap between the EL spectrum of the matrix material and the absorption spectrum of the dye. ... 

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