7.光电子学new

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1、Slide1Electromagneticspectruminsertwavelengthsofbluetored.6.071Optoelectronics1Slide2ElectromagneticspectrumE=hn=kTeE-Energyk-Plank’sconstantn-frequencyk-Boltzman’sconstantTe-equivalenttemperature°K6.071Optoelectronics2Slide3ElectromagneticSpectrumslidedeletedSlid

2、e4Light-emittingdiodes(LEDs)anodecathodeanodepncathodeWhenelectronsandholescombineinthedepletionregiontheexcessenergyisgivenupintheformofaphoton.Thisenergyischaracteristicofthematerialsfromwhichthejunctionisconstructedandthusthephotonalwayshasthesamewavelength.Toe

3、mitphotonsthejunctionmustbeforwardbiased,andthewavelengthastypicallyred,green,yellow,orintheinfrared.TheLEDsitsinareflectorandiscoveredbyaplasticdiffuser.6.071Optoelectronics4Slide5Light-emittingdiodes(LEDs)simpleLED,red,green,blinkingLED,blinks1-6timesyellow,oran

4、ge,orinfrared.persecond.Canbeusedasatrivialoscillator.Simplemeansofcreatingnumbersandcharacters.ForTricolorLED,greenonenumbersdriveway,redtheother.with74HC4511.6.071Optoelectronics5Slide6LEDsspecsviewingintensityforwardreversemaxDCmaxanglevoltagebreak-currentpower

5、dropdownLEDtypedegreescolorMCDVVmAmWNTE3000indicator80red1.41.6554080NTE3010indicator90green12.2535105NTE3026tristate50red/gree1.5/0.51.65/2.270/35200nNTE3130blinker30yellow35.250.420NTE3017infrared1.286100175Noticethattheforwardvoltagedropisnotthe0.6Vweassociatew

6、ithasilicondiode,andthatthereversebreakdownvoltageisquitesmall.6.071Optoelectronics6Slide7LEDoperationGraphsproducedwithMathematica™6.071Optoelectronics7Slide8LEDDatasheet6.071Optoelectronics8Slide9LEDDatasheet26.071Optoelectronics9Slide10SomeLEDapplicationsvoltag

7、elevelsensorlogicprobeVccVinLEDlightswhenthebreakdownvoltageoftheAlogichighturnsonthezenerisexceeded.TheDarlingtonpairandthesourcemustprovidetheLED.ThisisahighcurrentfortheLED.impedancemeasurement.6.071Optoelectronics10Slide11TristatepolarityindicatorIgAtristatedi

8、odeindicatesthedirectionofDCcurrentflow,orifVinthecurrentisAC.IrR1ThediodeprotectsforreversedvoltagebreakdownandtheresistorsprotectthetristatediodeR2fro