Using LEDs and Phosphorescent Materials To Teach High School Students Quantum Mechanics. A Guided-Inquiry Laboratory for Introductory High School Chemistry

Kazem Kazerounian
Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269
William P. Green , Alan Trotochaud and Julia Sherman
E. O. Smith High School, Storrs, CT 06268
Elias W. Faraclas
Digi International, Lindon, UT 84042
J. Chem. Educ., 2009, 86 (3), p 340
DOI: 10.1021/ed086p340
Publication Date (Web): March 1, 2009

Abstract

The quantization of electronic energy levels in atoms is foundational to a mechanistic explanation of the periodicity of elemental properties and behavior. This paper presents a hands-on, guided inquiry approach to teaching this concept as part of a broader treatment of quantum mechanics, and as a foundation for an understanding of chemical behavior. The approach is centered around two laboratory experiments in which students use light emitting diodes (LEDs) to test hypotheses related to the quantization of energy levels. In the first experiment, students determine the relationship between the voltage required to light a series of LEDs and the wavelength of the light emitted. In the second experiment, they determine the relationship between the intensity and wavelength of a series of LEDs to the intensity of the glow produced by a piece of phosphorescent material exposed to those LEDs. From the experiments and guided discussion, the students can build a solid understanding of the quantization of energy levels and transitions in atoms. This can provide them with a firm foundation on which to build their understandings of quantum mechanics and chemical behavior in general.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Chemical Engineering

Keywords (Feature):

View from My Classroom

Keywords (Pedagogy):

Calculator-Based Learning

Keywords (Subject):

Atomic Properties / Structure
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  • Received: August 03, 2009

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