Multi domain modelling of power LEDs based on measured isothermal and transient I-V-L characteristics

Recent research has already proved that the characteristics of LED systems can be analyzed creating multi-domain models with tightly coupled electrical, thermal and optical operation. Transient models of the electric and thermal effects have been already successfully established but experimental verification of the dynamic optical behavior was neglected as fast radiometric and photometric measurements have not been available. The present paper outlines two measurement techniques which extend the methodology towards radiometric transients, calibrated by isothermal results. It proposes adequate instrumentation and highlights metrology problems through a measurement example.