2010: HAA Seed Ahmed, MM Duvenhage, OM Ntwaeaborwa and RE Kroon. Luminescence from rare-earth doped silica prepared by the sol-gel method. 55th Conf. of South Africa Institute of Physics (CSIR, Pretoria).
2011: HAA Seed Ahmed, JR Botha, WD Roos, OM Ntwaeaborwa and RE Kroon. Energy transfer in Ce/Tb co-doped sol-gel silica. 4th African Laser Centre Student Workshop (Zevenwacht Wine Estate, Stellenbosch).
2012 RE Kroon, OM Ntwaeaborwa, HC Swart and HAA Seed Ahmed. Lifetime measurements of Ce and the energy transfer mechanism in Ce,Tb co-doped LaF3. Annual HASYLAB Report (DESY synchrotron, Hamburg, Germany)
2012 HAA Seed Ahmed, OM Ntwaeaborwa and RE Kroon. Interaction mechanism for energy transfer from Ce to Tb ions in silica. 5th African Laser Centre Student Workshop (Safari Lodge, Windhoek, Namibia).
