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Electroluminescent and Optoelectronic Properties of OLEDs with Bay‐Extended, Distorted Perylene Esters as Emitter Materials
Author(s) -
Vollbrecht Joachim,
Blazy Simon,
Dierks Philipp,
Peurifoy Samuel,
Bock Harald,
Kitzerow Heinz
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201700502
Subject(s) - perylene , electroluminescence , common emitter , oled , materials science , optoelectronics , layer (electronics) , excited state , photochemistry , chemistry , nanotechnology , molecule , organic chemistry , physics , nuclear physics
Abstract Three esters with a perylene, a unilaterally, and a bilaterally extended perylene core, respectively, were used as emitter materials for organic light‐emitting diodes. The electroluminescent properties of these devices were studied. Different spectral shifts were found, which can be attributed to the formation of excited dimers (excimers) in the nanofilms of the emitter materials. Thermal treatment of the unilaterally extended derivative resulted in a red‐shift of the electroluminescence owing to the formation of a denser nanofilm. The luminance and efficiency of optoelectronic devices employing the extended perylene esters exceed those of devices using an emitter layer comprised of the perylene ester. Different deposition methods, limitations in the deposition process, and the role of hole‐transporting materials are compared.