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Durability tests of solution-processed organic electrophosphorescent devices (SP-PHOLEDs) with small organic molecules have been investigated. By using poly(ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT) as a buffer layer and indium zinc oxide (IZO) as an anode, device durability was markedly improved. The lifetime of the SP-PHOLED, defined as half-luminous at an initial luminance of 1,000 cd/m 2 , was 60 h.
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Ooe et al. (2006) studied this question.
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