Green-light–emitting electroluminescent device based on a new cadmium complex

EPL (Europhysics Letters) (Impact Factor: 2.1). 06/2010; 90(5). DOI: 10.1209/0295-5075/90/57004


A new cadmium complex is synthesized to investigate its stability and applicability for a luminescent device. The as-prepared Cd(Bpy)q sample is characterized by Fourier-transformed infra-red spectroscopy (FTIR), thermal gravimetric analyzer (TGA) and photoluminescence (PL). The prepared sample shows excellent thermal stability up to 380 °C. A maximum is observed at 240 nm in absorption spectra which is attributed to the pi-pi* transition. An organic-light-emitting diode (OLED) has been fabricated using this material. The fundamental structures of the device exhibit ITO/alpha-NPD/Cd(Bpy)q/BCP/Alq3/LiF/Al. The electroluminescence (EL) device emits bright green light with maximum luminescence 1683 cd/m2 at 20 V.

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Available from: Akshay Kumar, Feb 16, 2014
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    • ". These electroluminescent materials emit light in the visible region. Nowadays cadmium complexes also have been synthesized by different groups for their use in OLEDs due to their thermal stability and wide spectral range as reported by Sotoyama et al. (2008),Gao et al. (2014)and Kumar et al.(2010,2011and 2014). In this work, we report the synthesis of a new photoluminescent material cadmium[(1,10-phenanthroline)(8-hydroxyquinoline)] and its optical properties (photoluminescence,UV-visible-spectra), structural properties (FTIR,NMR) and thermal stability (TGA ). "
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    ABSTRACT: A new photoluminescence material cadmium [(1,10-phenanthroline)(8-hydroxyquinoline)] Cd(Phen)q has been synthesized and characterized. The prepared material Cd(Phen)q was characterized by Fourier-infrared spectroscopy(FTIR),Nuclear magnetic resonance spectroscopy (NMR),Thermo gravimetric analysis (TGA), UV-visible spectroscopy and photoluminescence (PL). Solution of this material Cd(Phen)q in toluene showed absorption maxima at 256nm and 295nm which may be attributed to the moderate energy (π – π*) transitions of the aromatic rings while absorption maxima at 335nm and 387 nm observed were due to the coordination of cadmium and organic ligands (Phen and q).The photoluminescence spectrum of Cd(Phen)q in toluene solution showed peak at 510nm.This material is thermally stable up to 4000C. The time resolved photoluminescence spectra of this material Cd(Phen)q showed two life time components, 3.8 ns and 15 ns respectively.
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    ABSTRACT: The stability and applicability of new cadmium complex, Cdmq2, is investigated for electroluminescent device application. The Cdmq2 is characterised by different characterisation techniques. It shows excellent thermal stability up to 440 °C. A maximum is observed at 390 nm in absorption spectra which attributed to π - π* transition. Organic light emitting diode (OLED) has been fabricated using this material. The integral parts of the device were ITO/α-NPD/Cdmq2/BCP/Alq3/LiF/Al. Electroluminescence (EL) device emits yellowish green light with maximum luminescence 1185 cd/m2 at 23V.
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