Förster energy transfer in combinatorial arrays of selective doped organic light-emitting devices

Cheon, K.O.; Shinar, J.
February 2004
Applied Physics Letters;2/16/2004, Vol. 84 Issue 7, p1201
Academic Journal
Energy transfer in highly-efficient doped organic light-emitting devices (OLEDs) is described and discussed. The OLEDs include a hole transport layer (HTL) and an electron transport layer composed of an efficient blue emitter. A region of the HTL adjacent to the host blue-emitting layer was doped with an efficient guest red dye. The blue emitter-to-red dye energy transfer probability P[sub HG][sup η] was determined by comparing the emission from the two fluorophores and its dependence on the applied field. P[sub HG][sup η] decreases with increasing field, probably due to an increasing fraction of dye molecules which are positively charged, i.e., which trap a hole. It is also estimated that at fields as low as 0.4 MV/cm, ∼50% of the dye emission is due to trap emission rather than Förster energy transfer. The analysis yields a Förster energy transfer radius R[sub 0]=33.5±3.5 Å. © 2004 American Institute of Physics.


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