OPTI 380A Lab 1 - Semiconductor Light Sources - slides-2

OPTI 380A Lab 1 - Semiconductor Light Sources - slides-2 -...

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1 OPTI 380A Intermediate Optics Lab 1: Semiconductor Light Sources Tom Milster Professor, College of Optical Sciences, University of Arizona milster@arizona edu milster@arizona.edu Light Emitting Diode (LED) Forward 7/27/2010 OPTI380A - Lab 1: Semiconductor Light Sources 2 Bias Anode (p) Cathode (n) - + !
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2 Light Emitting Diode (LED) Forward Bias Cathode (n) - ! Anode (p) + 7/27/2010 3 OPTI380A - Lab 1: Semiconductor Light Sources LED Far-Field Pattern ! LED far-field patterns vary greatly, depending on the electrode layout and the type of lens in which the LED is encased. ! The LED you will be using in the lab has this characteristic: Cotco LED LD-701CHR1-A5 7/27/2010 OPTI380A - Lab 1: Semiconductor Light Sources 4
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3 Light Emitting Diode (LED) ! Semiconductor that emits incoherent narrow-spectrum of light upon application of a current. ! An LED is a semiconductor diode with a structure called the p-n junction. Blue, green and red LEDs Spectra of blue, yellow-green and red LEDs FWHM is ~24-27 nm 7/27/2010 OPTI380A - Lab 1: Semiconductor Light Sources 5 Other LED Characteristics for This Lab Cotco LED LD-701CHR1-A5 Emission area ~ 1mm 2 7/27/2010 OPTI380A - Lab 1: Semiconductor Light Sources 6
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4 Inorganic semiconductor materials ! aluminum gallium arsenide (AlGaAs) - red and infrared ! aluminum gallium phosphide (AlGaP) - green ! aluminum gallium indium phosphide (AlGaInP) - high-brightness orange- red, orange, yellow, and green ! gallium arsenide phosphide (GaAsP) - red, orange-red, orange , and yellow ! gallium phosphide (GaP) - red, yellow and green ! gallium nitride (GaN) - green, pure green (or emerald green), and blue ! indium gallium nitride (InGaN) - near ultraviolet, bluish-green and blue ! silicon carbide (SiC) as substrate blue 7/27/2010 OPTI380A - Lab 1:
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OPTI 380A Lab 1 - Semiconductor Light Sources - slides-2 -...

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