Figure 3. Emission spectra of three different types of LEDs with specific emission maxima, recorded with the self-built spectrometer

From

An Experimental Introduction to Basic Principles of the Interaction of Electromagnetic Radiation with Matter

Patrick Schairer, Stephan Wagner, Ekkehard Geidel

World Journal of Chemical Education. 2018, 6(1), 29-35 doi:10.12691/wjce-6-1-6