Energy and cost-efficient, facade-integrated daylight and LED lighting solutions using micro-optic building components

Example of the light-redirecting structure
© AG MST, TU Dortmund
Schematic diagram and example of the light-redirecting structure.
Example of the light-emitting structure
© AG MST, TU Dortmund
Schematic diagram and example of the light-emitting structure.
Intensity distribution curve
© Fraunhofer IBP
Intensity distribution curve of the light-emitting structure in Dialux Evo.

The aim of the project is to improve the building energy performance, the life cycle balance and the quality of indoor environments by using micro-structured optical components for daylighting and electrical lighting applications.

There are two compatible micro-optical structures under development that can be combined with one another, namely

- Light-redirecting structures, which are applied to both sides of transparent substrate layers and are being optimized for redirecting glare-free daylight deeply into the building interior.

- Light-emitting structures at the surface of transparent substrates, which emit laterally injected LED light specifically on one side only. The element remains transparent when viewed from above (plan view).


The project work comprises 6 coordinated work packages:

 Component optimization,

 Production processes,

 Systems integration,

 Testing of components and systems, characterization,

 Prototypical application,

 Participation in IEA SHC Task 56 "Building integrated solar envelope systems".


First results in the form of selected prototypes are expected to be available in spring 2017.


The project receives funding from the German Federal Ministry for Economic Affairs and Energy (BMWi) under reference no. FKZ: 03ET1330D.