A new tutorial on exciton-phonon coupling in Yambo is available. In this tutorial we will show how to generate exciton-phonon matrix elements and calculate phonon-assisted absorption and emission. In the last part of the tutorial the exciton-phonon matrix elements will be used to calculate exciton life-time. The tutorial is based on a preliminary version of Yambo not fully tested, used at your own risk:

https://www.yambo-code.eu/wiki/index.php/Exciton-phonon_coupling_and_luminescence

More detail on this implementation are available in the Phd thesis of Pierre Lechifflart:
Exciton-phonon coupling and phonon-assisted luminescence in hexagonal Boron Nitride nanostructures