Electronic and thermal properties of compounds bearing diimide, azomethine and triphenylamine units
PBN-AR
Instytucja
Centrum Materiałów Polimerowych i Węglowych Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Optical Materials
ISSN
0925-3467
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2014
Numer zeszytu
Strony od-do
543-551
Numer tomu
37
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 7)
Pozostali autorzy
+ 5
Słowa kluczowe
en
Polyimides;
(poly)Azomethines;
Azomethine diimides;
Electrochemistry;
Photoluminescence;
Organic light-emitting diodes
en
LIGHT-EMITTING-DIODES;
HOLE TRANSPORT;
ELECTROPHOSPHORESCENT DEVICES;
OPTICAL-PROPERTIES;
PHOTOLUMINESCENCE;
STABILITY;
POLYMERS
Streszczenia
Język
en
Treść
New triphenylamine containing azomethine diimides and two kinds of poly(azomethine imide)s, i.e., linear and branched were synthesized. These compounds were prepared from two diamines, that is, N,N'-bis(4-amino-2,3,5,6-tetramethylphenyl)phtalene-1,2,4,5-dicarboximide (DAPhDI), N,N'-bis(5-aminonaphtalen)naphthalene-1,4,5,8-dicarboxyimide (DANDI-2) and 4-formyltriphenylamine, 4,4'-diformyltriphenylamine and 4,4',4 ''-triformyltriphenylamine. The structures of the compounds were characterized by means of FTIR, H-1 NMR spectroscopy and elemental analysis; the results show an agreement with the proposed structure. Thermal properties of prepared azomethine diimides and polymers were evaluated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Obtained compounds exhibited high thermal stability with 5% weight-loss temperatures above 390 degrees C. Azomethine diimides exhibited glass-forming properties with high glass-transition temperatures 216 and 308 degrees C. Optical properties of the prepared compounds were investigated by UV vis and photoluminescence (PL) measurements. All compounds emitted blue light in NMP solution and in solid state as blend with PMMA. The electrochemical properties, that is, orbital energies and resulting energy gap were estimated based on cyclic voltammetry (CV). All synthesized material showed reversible reduction process, furthermore AzPhDI and AzNDI showed partially reversible oxidation process. Electrochemical hand gap was found in the range 1.23-1.70 eV. Low molecular weight model compounds were tested as bipolar host materials in blue phosphorescent organic light emitting diodes (OLEDs). The devices exhibited turn-on voltages of about 5.5 V and maximum brightness of 40-220 cd/m(2). (C) 2014 Elsevier B.V. All rights reserved.
Cechy publikacji
oryginalny artykuł naukowy
Inne
System-identifier
PX-56b463548106eb71826e40e4
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