Abstract
Metal complex bis(5,7-dimethyl-8-hydroxyquinolinato)beryllium(II) as a light emissive material had been synthesized and characterized by various spectral techniques. The beryllium complex had high thermal stability (>250°C) as well as high glass transition temperature (>115°C). The prepared metal chelate had a strong photoluminescence (PL) emission at 558nm (FWHM=72nm) and electroluminescence (EL) at 561nm (FWHM=55nm) with good efficiency. Density functional theoretical calculations have been performed to demonstrate the three-dimensional geometries and the frontier molecular orbital energy levels of this metal complex. Sublimed metal chelate formed thin transparent film and found appropriate material for exploring their opto-electronic applications. OLED device was fabricated using this metal complex by vacuum deposition technique with the device configuration of ITO/TPD(30nm)/Be-complex(30nm)/BCP(6nm)/Alq3(28nm)/LiF(1nm)/Al(100nm). The emitted color of the EL device showed Commission Internationale d'Eclairage (CIE) color coordinates as x=0.625, y=0.366 corresponding to greenish yellow color. The maximum luminescence of the fabricated device was reported 1364Cd/m2 at 22V. The maximum current efficiency and power efficiency were 1.75Cd/A and 0.51lm/W at 10V respectively for the fabricated OLED device.
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