Open AccessSubstituent position-induced color tunability in polymer light-emitting diodes
Author(s) -
Jin Young Kim,
Sung Heum Park,
Kwanghee Lee,
In Suk Yum,
Sung Ho Jin
Publication year - 2002
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.1502911
Subject(s) - substituent , electroluminescence , planarity testing , conjugated system , steric effects , materials science , oled , polymer , photochemistry , chemistry , light emitting diode , optoelectronics , crystallography , stereochemistry , nanotechnology , layer (electronics) , composite material
We report substituent position-induced color tunability in polymer light-emitting diodes fabricated with poly[2-{2- or 3- or 4-[(3,7-dimethyloctyl)oxy] phenyoxy}-1,4-phenylenevinylene] (DMOPPPV). When the position of the substituent in DMOP-PPV moves to the ortho, meta, and para sites, the corresponding photo- and electroluminescence spectra shift their peaks to a longer wavelength of about 540, 560, and 585 nm, respectively. We ascribe this to the different degree of steric effect in the backbone for each substituent position. As the substituent position is closer to the main chain, the planarity of the backbone is less conserved, thereby reducing the effective conjugated length of the main chain and broadening the pi-pi(*) energy gapopen6
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