11-25-08

11-25-08 - optical power generated: Emit time , ;...

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Unformatted text preview: optical power generated: Emit time , ; reenm’bifiaition 13mm 3: . m fight}. Pepi; N 33:? Paige , [mmmbinatiens][ phn'tzans energy] Pam m ' ' " i ' loadline: m Ei- WE m Vii) intersection gives operating point ' A. GaAs LEI? is dgaigned m gem-am 15 111W 3 V battery and had resistar. T m .293 K (mam tampaxatm) is 1 x 19‘3 A/czmg 19M rasistamai at” light in a germ aircuit with a Asgume that fiae émisaian wavelength is 860 my .: 332: m 1139-3 the meme satmtifin fififl‘éifilt {iflflSifiy g and the junctiaz: area 53 (1 mm}? Damaging ‘the requixed. Sainim: {Esng Mill»? )3 the regaim current is m min m . g; m 9‘ 813% {€3.&8)(-6,63 x 10*34)(3 x 10mg) Wit? W 5&3“ i0 3 {10”35/13192X10“? cm?) a 1143*“3 A; Sam-(13,21) gives mam mlmgje . 1% figglfi x (mm. )(293) 11163139 5; ‘ 1.5 3:10-19" 1M > 5‘ mm IV 2:) Nate “that; thia 3381112353 games? recmbizaatimmutside the depletian regifin. Far ganja: remmbinatian inside £1153 dapiatm rgginng Vig- ail! ha Wise this3 {11* 05965 192 Tim rtaaistaace is than fauna frat}: Eq.(11«3 ) ' 3 Modulation and time response V LED frequency response Emission Efficiency radiative rate: since ' Auger process fiftflfga] m flaw “E” B?" R fa %2 internal efficiency: n m Wmm Canime the radiativg effigignaies aft): GaAs (£39 a 1.42 eV} and In.ggGa.4?As {Eg : 0.?4 éV): far time 3am alactmn {163511;}? of 22 m 5 X 1.813 {Em—'3‘ Take Aligax canstéms {1f 5 x 16‘39 cmfi/s and 1 319% {mg/3 far Gafia and InGaAs} mp3s» tivaly. ‘ Sgiatim: Fr}? (33%.). the. radiaéiva and Auger rates an (aging Br fiam Table’iflél) . I _ 3V ’ V w, :2 Barn 3 (7.2 x 10493:”) (5 x iaisgm”3) a 3,6 x 1095'? >. a , w ‘_ 3W3. wfificm ‘13 4'2”, «3—: nger « CAR a» (5 r»: 10 7;) (5 x 16E cm ) h 125 x 10 5 Far l‘nfigGagfis the éa'rmpanding rates are W} m Bria m (é x mm???) :x: 1033mm?) x 2 1x: 103 a”: - - -5. _ 2W -g5m » ‘ ~13 .453”. a m; WAuger «- an m X 395.18 gm m 34:10 5 Nam that all these rates axe mmh Iargar than $133 némadiafive decay fate ti} traps, Am w 10? 3””. Themfore flag efficiency far the W9 materiala is .35 35 + .125 GaAS: aim; 1': 2 0,97 IRGaAS: mm; x :- $31374 External Efficiency Problem 1: light can be reabsorbed by semiconductor Estimate the external effisianay-far a GaAg LED emitting into air; 3mm: Light. is emitted iatn a gene of half—aagie 336“ a rad. The geiié angle is ' ' Qwfiiwwflagmazém ml the Fresaei tmszéfissiaa i3 ¥ , was; 1* =3§5m13 Tm1-( )mlm(m):0.6$ .fl;+flg 313+}. The :23:th afiiiziezzcy i3 i113: 0246 , 4 , - ’. 3&9! gm gig {068) 3 Dome LED (indicator Light) Burrus type (multimode fiber coupling) ...
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This note was uploaded on 03/17/2010 for the course PH 2501 taught by Professor Quimby during the Fall '09 term at WPI.

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11-25-08 - optical power generated: Emit time , ;...

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