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High power efficiency phosphorescent poly(dendrimer) OLEDs

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Abstract

We show that it is possible to produce an efficient solution-processable phosphorescent poly(dendrimer) OLED with a 32 lm/W power efficiency at 100 cd/m2 without using a charge transporting host or any improvements in light extraction. This is achieved by using the dendrimer architecture to control inter-chromophore interactions. The effects of using 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA) as a charge transporting host and using a double dendron structure to further reduce inter-chromophore interactions are also reported.

©2012 Optical Society of America

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Figures (4)

Fig. 1
Fig. 1 The materials structures of phosphorescent polymer 1, poly(dendrimer) 2 and poly(dendrimer) 3.
Fig. 2
Fig. 2 Absorption (left panel), photoluminescence (center panel) and electroluminescence (right panel) of a neat film of 2 (thin black line, device A for EL), a blended film of 20 wt% 2 in TCTA (dashed thin blue line, device B for EL) and a neat film of 3 (thick red line, device C for EL).
Fig. 3
Fig. 3 Current density (A) and brightness (B) of the devices versus voltage. The emissive layer was a neat film of 2 (device A, black line), a blended film of 2, 20 wt% in TCTA (device B, dashed blue line) and a neat film of 3 (device C, red line).
Fig. 4
Fig. 4 External quantum efficiency (A) and power efficiency (B) of the devices versus brightness. The emissive layer was a neat film of 2 (device A, black line), a blended film of 20 wt% of 2 in TCTA (device B, dashed blue line) and a neat film of 3 (device C, red line).
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