Influence of p-isopropenylcalixarenestyrene copolymer buffer layer over Alq3 based OLEDs P. K. Petrova, R. L. Tomova, R. T. Stoycheva-Topalova and St. M. Miloshev Eur. Phys. J. Appl. Phys., 51 3 (2010) 33210 Published online: 02 September 2010 DOI: 10.1051/epjap/2010111