Creating a Molecular-scale Graded Electronic Profile in a Single Polymer to Facilitate Hole Injection for Efficient Blue Electroluminescence


  • The authors thank the Ministry of Education and the National Science Council for financial support though projects 91E-FA04-2-4A and NSC 95-2752-E-007-008&005-PAE, respectively. Supporting Information is available online from Wiley InterScience or from the author.


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Graded electronic profile in single polymer can be established by grafting dual hole-transporting groups onto the polymer structure with finely adjusted spatial and energetic sequence among them. Light emitting devices based on these materials exhibit external quantum efficiencies of 4.54% and 7.53% for deep blue and blue emitting devices, respectively. The present efficiencies for devices with merely simple sandwich structures challenge other polymer-based blue devices to date.