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Synthesis and Characterization of 9‐(Fluoren‐2‐yl)anthracene Derivatives as Efficient Non‐Doped Blue Emitters for Organic Light‐Emitting Diodes
Author(s) -
Prachumrak Narid,
Namuangruk Supawadee,
Keawin Tinnagon,
Jungsuttingwong Siriporn,
Sudyoadsuk Taweesak,
Promarak Vinich
Publication year - 2013
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.201300165
Subject(s) - oled , electroluminescence , anthracene , triphenylamine , chemistry , doping , photochemistry , thiophene , quantum efficiency , amorphous solid , biphenyl , optoelectronics , materials science , layer (electronics) , organic chemistry
A series of 9‐(fluoren‐2‐yl)anthracene derivatives bearing either thiophene (FATh), triphenylamine (FAT and FATT) or pyrene (FATP) moieties as substituents have been designed, synthesized, and characterized as non‐doped blue emitters for organic light‐emitting diodes (OLEDs). Their optical, electrochemical and thermal properties have been investigated, and their molecular structure‐property relationships were evaluated. All FAT, FATT and FATP compounds possess combined blue‐light‐emitting and hole‐transporting characteristics, and showed stable amorphous states with high fluorescence quantum yields in solution (up to 89 %) and strong luminance in the OLED devices, whereas FATh showed poor photoluminescent and electroluminescent properties. Efficient, non‐doped blue and Alq3‐based green OLEDs were fabricated and characterized. The blue and green devices with maximum luminance efficiencies and CIE coordinates of 3.17 cd A –1 and (0.13, 0.14), and 3.81 cd A –1 and (0.28, 0.50) were achieved, respectively, with FATT having 4‐{bis[4′‐(diphenylamino)biphenyl‐4‐yl]amino}phenyl substituents as emitting layer and hole‐transporting layer, respectively. These devices also showed considerably low turn‐on voltages of 3.0 and 2.6 V, respectively.