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Synthesis, Characterisation, and Electroluminescence Properties of N ‐Coumarin Derivatives Containing Peripheral Triphenylamine
Author(s) -
Kotchapadist Palita,
Prachumrak Narid,
Sunam Thitiya,
Namuangruk Supawadee,
Sudyoadsuk Taweesak,
Keawin Tinnagon,
Jungsuttiwong Siriporn,
Promarak Vinich
Publication year - 2015
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201402680
Subject(s) - triphenylamine , electroluminescence , chemistry , oled , thermal stability , pedot:pss , photoluminescence , substituent , carbazole , photochemistry , analytical chemistry (journal) , layer (electronics) , optoelectronics , materials science , organic chemistry
A series of N ‐coumarin derivatives, namely CTh n T and CTh n CT ( n = 1–2), containing triphenylamine or triphenylamine‐substituted carbazole as substituent were synthesised, and their structures were confirmed by MALDI‐TOF MS, and NMR and IR spectroscopy. Their optical, physical and electroluminescence properties as non‐doped solution‐processed light‐emitters for OLEDs were investigated. DSC, TGA, AFM and PL spectra revealed their good film‐forming properties, high thermal and morphological stability, and good photoluminescence characteristics. The double‐layer solution‐processed OLEDs (ITO/PEDOT:PSS/EML/BCP/LiF:Al) fabricated using CTh n T and CTh n CT as the emissive layer and BCP as the electron‐transporting and hole‐blocking layer, exhibited stable green to orange electroluminescence ( λ EL = 536–592 nm) with turn‐on voltages of 2.7–2.9 V and maximum luminance efficiencies up to 3.94 cd A –1 at 17.6 mA cm –2 (maximum power efficiency of 1.62 lm W –1 ).