Recombination efficiency distribution

Figure 13-11. (a) A diagram showing ihc spatial distribution of lire relative hole and electron currents in an OLED. The recombination efficiency h is equal to the fraction of the electron (hole) current that docs not make it to the anode (cathode) (b) cll icicncy-currcni balance diagram for OLEDs. Sec text for details. 

The nature of the analytic solution led to the concept of an efficiency-current balance diagram, which is useful even when the assumptions of the analytic result do not hold. In Figure 13-1 la, a schematic of the spatial distribution of the electron and hole currents inside an OLED is shown. The difference in height between the left and right ends of the boundary is the recombination efficiency, b, which is equal to In Figure 13-1 lb, the ordinate of the diagram is the... 

The electronic state distribution of the excitons trapped in the material affect recombination efficiency. An excited configuration of a molecule consists of an excited electron in a LUMO state paired with a hole in a HOMO state. The hole,... 

The effect of an inertial increase in recombination intensity I(t) was observed experimentally in many insulating crystals including alkali halides [51, 52], Ba3(P04)2 [53], a-Al203 [54], Na-salt of DNA (Fig. 4.4) [52], The advantage of this technique which is efficient for the identification of tunnelling stages of reactions in insulators is that the initial and final steady-state recombination profiles are known and could be calculated by means of equation (4.2.11) unlike the initial distribution which is usually believed to be random but in fact is unknown. 

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