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

Rahul Kumar¹, Ritu Srivastava², Akshay Kumar¹, M. N. Kamalasanan² and K. Singh¹

¹  School of Physics and Material Science, Thapar University - Patiala-147004, India
²  Centre for Organic Electronics, National Physical Laboratory - New Delhi-110012, India

Corresponding author: kusingh@thapar.edu

Received: 13 January 2010
Accepted: 30 May 2010

Abstract

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 π-π* transition. An organic-light–emitting diode (OLED) has been fabricated using this material. The fundamental structures of the device exhibit ITO/α-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.