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Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes
Author(s) -
Tagare Jairam,
Ulla Hidayath,
Kajjam Aravind Babu,
Satyanarayan M.N.,
Vaidyanathan Sivakumar
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700056
Subject(s) - triphenylamine , oled , common emitter , electroluminescence , materials science , thermal stability , photochemistry , thermal decomposition , optoelectronics , analytical chemistry (journal) , chemistry , nanotechnology , organic chemistry , layer (electronics)
In this work, new star‐shaped conjugated organic emitter, namely tris(4‐(1‐(9,9‐diethyl‐9H‐fluoren‐2‐yl)‐1H‐phenanthro[9,10‐d]imidazol‐2‐yl)phenyl)amine (PIFTPA) with donor‐π‐acceptor (D‐π‐A) structure, was designed and synthesized by combining three fluoren‐phenanthroimidazole arms into a triphenylamine core and characterized using 1 H, 13 C NMR and mass spectrometry. The detailed photophysical, thermal, electrochemical and electroluminescence properties were systematically studied. The organic emitter exhibits high glass transition temperature (230 °C) and high thermal stability with decomposition temperature. Electrochemical analysis reveals that the emitter has distinct oxidation and reduction behaviours. Furthermore, theoretical calculations (DFT) were performed to get a better understanding of the electronic structure. The OLEDs using this emitter as emissive material showed good device performance (6.45 cd/A, 4.39 lm/W, and 3.01%) with yellow emission and a low turn‐on voltage (2.87 V). The results demonstrate that TPA integrated with phenthroimdazole plays an important role in the device performance.