Journal
ORGANIC ELECTRONICS
Volume 13, Issue 7, Pages 1197-1203Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2012.03.019
Keywords
Blue organic light-emitting diode; Anthracene; Triplet-triplet annihilation
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The molecular design strategies for the host materials suitable for highly efficient, blue fluorescent organic light-emitting diodes (OLEDs) are demonstrated. The device characteristics of blue fluorescent OLEDs are compared with different host materials. Some devices exhibit a highly efficient blue electroluminescence with a high external quantum efficiency of more than 7%. The correlation between OLED efficiency and triplet-triplet annihilation is characterized by measuring the up-conversion of triplet excited states into singlet ones. The host materials require an anthracene unit and a bulky molecular structure to prevent the overlap of anthracene units between adjacent molecules in the film. (C) 2012 Elsevier B. V. All rights reserved.
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