A paper published by PhD student Mohammad Babazadeh, Associate Professor David Huang, and Professor Paul Burn in Physical Chemistry Chemical Physics on “Calculating transition dipole moments of phosphorescent emitters for efficient organic light-emitting diodes” has been selected by the journal as a 2019 HOT Article. The research in the paper provides new insight into the role of molecular geometry and environmental effects on the orientation of the transition dipole moment, which plays a key role in determining the efficient of out-coupling of light from organic light-emitting diodes.