An ionic terfluorene derivative for saturated deep-blue solid state light-emitting electrochemical cells
Journal
Journal of Materials Chemistry
Journal Volume
21
Journal Issue
12
Pages
4175-4181
Date Issued
2011
Author(s)
Abstract
In this study, we obtained saturated deep-blue electroluminescence (EL) from solid state light-emitting electrochemical cells (LECs) incorporating the ionic terfluorene derivative 1, which we synthesized through covalent tethering of methylimidazolium moieties as pendent groups of terfluorene. Compound 1 exhibited the deep-blue emission, extremely high quantum yield, and reversible redox behavior that are characteristic of terfluorene derivatives. LEC devices incorporating terfluorene 1 exhibited deep-blue EL with CIE coordinates of (0.159, 0.115) and (0.151, 0.122) in the absence and presence, respectively, of the ionic liquid (IL) BMIM·PF6. The peak external quantum efficiency and peak power efficiency of 1 in the presence of the IL reached 1.14% and 1.24 lm W−1, respectively. These CIE coordinates are the most saturated blue emissions ever reported for LECs.
SDGs
Type
journal article