In an earlier contribution in "Physics Education" (Bitzenbauer and Meyn 2020 "Phys. Educ." 55 055031 [see EJ1263541]), we presented a new teaching sequence on quantum optics on the secondary school level, and we reported on promising results of a first pilot study concerning its learning effectiveness. In the sense of design-based research, the developed teaching material is now being revised in several iteration steps and optimised through feedback from teachers from the field in order to favour the implementation of the new teaching approach to quantum physics in secondary schools. We present the design principles from the literature that our teaching material's development is based on and report on a survey of physics teachers' practical experiences with our teaching material.