Researchers of Karlsruhe Institute of Technology (KIT) in Germany have developed a novel, even more economical LED street light by replacing conventional high-performance LED with a special array of weaker LEDs. The new approach succeeded in reducing power consumption by 20 percent. Michael Heidinger at KIT's Light Technology Institute (LTI) designed a smart circuit that compensates aging and failure of individual LEDs. With the new approach, it is possible to install a large number of LEDs on a single board at low cost. Moreover, the LEDs incre...

Use of copper as a fluorescent material allows for the manufacture of inexpensive and environmentally compatible organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) ensures high light yield. Scientists of Karlsruhe Institute of Technology (KIT), CYNORA, and the University of St. Andrews have now measured the underlying quantum mechanics phenomenon of intersystem crossing in a copper complex. The results of this fundamental work are reported in the Science Advances journal and contribute to enhancing the energy efficiency of OLEDs.