Charge carrier mobility and electroluminescence in a green-emitting alternating block copolymer with a methoxy bi-substituted chromophore

AUTOR(ES)

Dongge, Ma, Hümmelgen, I. A., Xiabin, Jing, Daike, Wang, Zhiyong, Hong, Lixiang, Wang, Xiaojiang, Zhao, Fosong, Wang

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2000-06

RESUMO

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 eV. 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 dc/m² at 12.5 V.

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