Determination of Planck’s Constant using Light Emitting Diodes

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dc.contributor.authorMosiori, Cliff Orori
dc.contributor.authorOeba, Duke Ateyh
dc.contributor.authorShikambe, Reuben
dc.date.accessioned2017-12-28T08:07:12Z
dc.date.available2017-12-28T08:07:12Z
dc.date.issued2017
dc.descriptionResearch Articleen_US
dc.description.abstractPlanck’s constant is named after Max Planck, a nineteenth-century physicist who first described it by relating it as E=husual meanings. It is a relationship used when comparing a quantum of energy absorbed to that emitted during electron transitions which can be extended to emission by light-emitting diodes. The purpose of this study was to determine Planck’s constant using the energy needed to excite free electrons in a light emitting diode. When a light-emitting diode is switched on, electrons recombine with holes within and release energy in the form of photons which can be determined using energy band gaps of the semiconductor composite material used to fabricate the LED. Therefore, LEDs consist of a chip of doped semiconducting layers to create a p-n junction. In LEDs, current flows easily from the p-side to the n-side but not in the reverse from electrodes with different voltages. When an electron meets a hole, it is inhaled and it falls into lower energy level releasing energy in the form of a photon. Photon emissions take place when electrons return to a lower energy state. Therefore, electrons within a LED crystal are excited to a higher energy state and any radiation emitted depends on the p-n junction direct band gap. Depending on the materials used, LEDs emit radiation with energies corresponding to either near-infrared, visible, or near-ultraviolet light. In reality, a LED is designed to have a small area (approximately less than 1 mm2). In this work, an electric current was used to excite electrons and the corresponding energy was measured using a voltmeter. Planck’s constant was calculated by substituting the obtained frequency and energy from the voltmeter in the relationship, E = h.en_US
dc.identifier.citationTraektoriâ Nauki = Path of Science. 2017. Vol. 3, No 10en_US
dc.identifier.issn2413-9009
dc.identifier.urihttp://ir-library.ku.ac.ke/handle/123456789/17987
dc.language.isoenen_US
dc.publisherPublishing Center Dialogen_US
dc.subjectLEDsen_US
dc.subjectBohr frequencyen_US
dc.subjectFermi’s Golden Ruleen_US
dc.subjectMax Plancken_US
dc.subjectEigen-functionsen_US
dc.subjectTime-independent Schrödinger equationen_US
dc.subjectTransition momenten_US
dc.subjectBloch oscillationen_US
dc.titleDetermination of Planck’s Constant using Light Emitting Diodesen_US
dc.typeArticleen_US
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