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Creating a Molecular‐scale Graded Electronic Profile in a Single Polymer to Facilitate Hole Injection for Efficient Blue Electroluminescence
Author(s) -
Huang ChihWei,
Peng KangYung,
Liu ChingYang,
Jen TzuHao,
Yang NengJye,
Chen ShowAn
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200800109
Subject(s) - materials science , electroluminescence , polymer , optoelectronics , blue light , grafting , nanotechnology , composite material , layer (electronics)
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.