Al-Attar, H.A., Griffiths, G.C., Moore, T.N., Tavasli, M., Fox, M.A., Bryce, M.R., Monkman, A.P., "Highly Efficient, Solution-Processed, Single-Layer, Electrophosphorescent Diodes and the Effect of Molecular Dipole Moment", Advanced Functional Materials, 2011