10 results match your criteria: "Annamalai University Annamalainagar 608 002[Affiliation]"
Efficient inverted bottom emissive organic light emitting diodes (IBOLEDs) with tin dioxide and/or Cd-doped SnO nanoparticles as an electron injection layer at the indium tin oxide cathode:electron transport layer interface have been fabricated. The SnO NPs promote electron injection efficiently because their conduction band (-3.6 eV) lies between the work function ( ) of ITO (4.
View Article and Find Full Text PDFEfficient blue, green and red phosphorescent OLEDs have been harvested from silver nanoparticles embedded at a glass:Ga-Zr-codoped TiO interface. The embedded silver nanoparticles at the interface removed the non productive hole current and enhanced the efficiencies. The blue emitting device (456 nm) with emissive layer Ir(fni) exhibits a maximum luminance () of 40 512 cd m (ITO - 37 623 cd m), current efficiency ( ) of 41.
View Article and Find Full Text PDFThe photophysical, electrochemical and electroluminescent properties of newly synthesized blue emitters with donor-π-acceptor geometry, namely, 4'-(1-(naphthalen-1-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-(2-[1,1'-biphenyl]vinyl)-4-amine (NSPI-TPA), 4'-(1-(2-methylnaphthalen-1-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-(2-[1,1'-biphenyl]vinyl)-4-amine (MNSPI-TPA), 4-(2-(4'-(diphenylamino)-(2-[1,1'-biphenyl]vinyl)-4-yl)-1-phenanthro[9,10-]imidazol-1-yl)-1-naphthalene-1-carbonitrile (SPNCN-TPA) and 4-(2-(4-(9-carbazol-9-yl)styryl)-1-phenanthro[9,10-]imidazol-1-yl)naphthalene-1-carbonitrile (SPNCN-Cz) were analyzed. The conjugation length in the emitters is not conducive to pure emission and hence, a molecular twisting strategy was adopted in NSPI-TPA, MNSPI-TPA, SPNCN-TPA and SPNCN-Cz to enhance pure emission. The emissive state (HLCT) of twisted D-π-A molecules containing both LE and CT (HLCT) states was tuned for high PL ( ) (LE) and high exciton utilization ( ) (CT) efficiencies by replacing triphenylamine (strong donor) with carbazole (weak donor).
View Article and Find Full Text PDFComparative optical, electroluminescence and theoretical studies were performed for ()-4'-(1-(4-(2-(1-(4-morpholinophenyl)-1-phenanthro[9,10-]imidazol-2-yl)vinyl)phenyl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-[1,1'-biphenyl]-4-amine (SMPI-TPA) and ()-4-(4-(2-(4-(2-(4-(9-carbazol-9-yl)phenyl)-1-phenanthro[9,10-]imidazol-1-yl)styryl)-1-phenanthro[9,10-]imidazol-1-yl)phenyl)morpholine (SMPI-Cz). These compounds show excellent thermal properties, dual charge transport properties and form thin films under thermal evaporation. Blue OLEDs (CIE: 0.
View Article and Find Full Text PDFRSC Adv
February 2018
Department of Chemistry, Annamalai University Annamalainagar 608 002 Tamilnadu India +91 9443940735.
We have fabricated stable efficient iridium(iii)-bis-5-(1-(naphthalene-1-yl)-1-phenanthro[9,10-]imidazole-2-yl) benzene-1,2,3-triol (acetylacetonate) [Ir(NPIBT) (acac)] doped inverted bottom-emissive green organic light-emitting diodes using Ti-doped ZrO nanomaterials as the electron injection layer. The current density () and luminance () of the fabricated devices with Ti-doped ZrO deposited between an indium tin oxide cathode and an Ir(NPIBT) (acac) emissive layer increased significantly at a low driving voltage (V) compared with control devices without Ti-doped ZrO. The Ti-doped ZrO layer can facilitate the electron injection effectively and enhances the current efficiency ( ) of 2.
View Article and Find Full Text PDFIndian J Med Res
September 2014
Unit of Vector Biology & Phytochemistry Department of Zoology, Annamalai University Annamalainagar 608 002, Tamil Nadu, India.
Evid Based Complement Alternat Med
September 2007
Department of Biochemistry, Faculty of Science, Annamalai University Annamalainagar 608 002, Tamil Nadu, India.
Hibiscus sabdariffa (HS) is an edible medicinal plant, indigenous to India, China and Thailand and is used in Ayurveda and traditional medicine. Alcoholic extract of HS leaves (HSEt) was studied for its anti-hyperammonemic and antioxidant effects in brain tissues of ammonium chloride-induced hyperammonemic rats. Oral administration of HSEt (250 mg kg(-1) body weight) significantly normalizes the levels of ammonia, urea, uric acid, creatinine and non-protein nitrogen in the blood.
View Article and Find Full Text PDFPol J Pharmacol
February 2004
Department of Biochemistry, Faculty of Science, Annamalai University Annamalainagar-608 002, Tamil Nadu, India.
The effects of alpha-ketoglutarate (alpha-KG) on sodium valproate-induced hyperammonemia and hepatotoxicity were studied in biochemical experiments in rats. The levels of ammonia, urea, serum transaminases, hydroperoxides and thiobarbituric acid reactive substances were significantly increased in sodium valproate-treated rats. These levels were significantly decreased in alpha-KG- and sodium valproate-treated rats.
View Article and Find Full Text PDFIndian J Dermatol Venereol Leprol
October 2012
Department of Dermatology, Radiology & Pathology. Rajah Muthiah Medical College & Hospital, Annamalai University. Annamalainagar- 608 002, India.