This is the third paper in our Light-Emitting Diodes series. The series aims to create a systematic library of LED-based materials and to provide the readers with the description of experiments and pedagogical treatment that would help their students construct, test, and apply physics concepts and mathematical relations. The first paper, published in the February 2014 issue of "The Physics Teacher," provided an overview of possible uses of LEDs in a physics course. The second paper discussed how one could help students learn the foundational aspects of LED physics through a scaffolded inquiry approach, specifically the ISLE cycle. The goals of this paper are to show how the activities described in our second paper help to deepen student understanding of physics and to broaden student knowledge by exploring new phenomena such as fluorescence. Activities described in this paper are suitable for advanced high school courses, introductory courses for physics and engineering majors, courses for prospective physics teachers, and professional development programs. [The first article in this series "Light-Emitting Diodes: A Hidden Treasure," is available in ERIC at EJ1032831; The second article "Light-Emitting Diodes: Exploration of Underlying Physics," is available at EJ1033041.]