Charge Carrier Mobility and Electroluminescence in a Green-Emitting Alternating Block Copolymer with a Methoxy Bi-Substituted Chromophore
نویسندگان
چکیده
We determine the mobility of positive and negative charge carriers in a soluble green-emitting alternating block copolymer with a methoxy bi-substituted conjugated segment. The negative charge carrier mobility of 6 10 11 cm/V.s is directly determined using space-charge-limited current analytical expressions. Positive charge carrier transport is also space-charge-limited, with a mobility of 1 10 8 cm/V.s. The electron trap distribution is exponential, with a characteristic energy of 0.12 eV. A hole trap with energy 0.4 eV was observed. This copolymer is used as emissive material in organic light-emitting diodes that present brightness of 900 cd/m at 12.5 V.
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