Multi quantum well structures in the deep blue emitted system 2-methyl-9,10-di(1napthyl)anthracene (α, α-MADN) are fabricated. The device structures are optimized with respect to the layer thickness and number of pairs forming the quantum wells. The Electroluminescence spectra are de-convoluted into 3 peaks with peak positions 432 nm, 458 nm and 500 nm, which are believed to arise due to the recombination of electrons and holes in the MADN, MADN/NPB interface and Alq 3 , respectively. It is observed that a better confinement of excitonic charges in different layers causes the efficiency to enhance by more than 25% using optimized thickness parameters and 2 pairs of quantum well structures.
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