A Schiff base bis(salicylidene)propylene-1,3-diamine (salpen) 2 and its complex with zinc metal as bis(salicylidene)propylene-1,3-diaminatozinc(II) [Zn(salpen) 2 ] were prepared and characterised by various spectral techniques. The zinc complex had high thermal stability (> 300 • C) as well as high glass transition temperature (> 150 • C). Optical properties of the metal complex were studied by UV-visible absorption and photoluminescence emission spectroscopy. Multilayered organic electroluminescent devices were fabricated with a structure ITO/α-NPD/Zinc(salpen) 2 /BCP/Alq 3 /LiF/Al, using the zinc complex as an emissive material. The electroluminescence peak emission was centred at 513 nm with colour chromaticity having Commission Internationale d'Eclairage (CIE) coordinates x = 0.26 and y = 0.50. A bright blue-green emission with a luminance of 1990 Cd/m 2 was recorded at 15 V as an optimum voltage.
2-(2-Pyridyl)benzimidazolato)-2-methyl-8-hydroxyquinolinatozinc(II)[ZnPBI(Meq)], 2-(2-pyridyl)benzimidazolato)-5-chloro-8-hydroxyquinolinatozinc(II) [ZnPBI (Clq)] and 2-(2-pyridyl)benzimidazolato)-8-hydroxyquinolinatozinc(II) [ZnPBI(q)] were synthesized and characterized for the purpose to be used as electroluminescent materials. All complexes emitted bright colored light on excitation by ultraviolet light source which showed their suitability for the operation in opto-electronic devices. Using a selected complex [ZnPBI(Meq)] as emissive layer, multilayered organic electroluminescent device was fabricated having structure ITO/a-NPD/Zinc complex/BCP/Alq 3 /LiF/Al, that produced bright bluish green emission at 532 nm. Maximum luminescence observed was 4038 cd/m 2 at 18 V while the turn on voltage of the device was 7 V. The Commission Internationale d'Eclairage chromaticity of the device had color coordinates at x = 0.35, y = 0.44 and was found to be independent of the operating voltages. The [ZnPBI(Meq)] complex exhibited high thermal stability ([300°C) and high glass transition temperature ([150°C).
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