3rd project
TRANSCRIPT
- 1. November9, 2011Welcome toseminar!1
2. 2 November 9, 2011Ni dung1.Hiu ng quang in 1. Lch s hiu ng quang in 2. Th nghim hiu ng quang in ngoi 3. Cc nh lut quang Gii thch 4. Hiu ng quang in trong 5. ng dng hiu ng quang in2.LED 1. Gii thiu v LED 2. Cu to v nguyn l hot ng 3. u im - nhc im 4. ng dng ca LED 5. Tng lai ca cng ngh LED 3. 1.1 Lch s hiu ng quang in3November 9, 2011 Hin tng quang in l g? 1839,AlexandreEdmond>>Hin tng quang in l hinBecquerel ln u tin quan sttng khi nh sng thch hp chiu thy hiu ng quang in xy ravo mt b mt kim loi, b mt pht vi mt in cc c nhngra cc electron. trong dung dch dn in c chiu sng 1887, Heinrich Hertz quan st thy hiu ng quang in ngoi i vi cc kim loi. Sau Aleksandr Grigoievic Stoletov tin hnh nghin cu mt cch t m v xy dng nn cc nh lut quang in. 1905, Einstein dng m hnh lng t gii thch hin tng quang in, ng c trao gii Nobel cho cng trnh ny nm 1921 4. 4November 9, 20111.2 Th nghim hiu ng quang inNgi ta dng mt thit b gi l t bo quang in kho sthin tng quang in. 5. 5November 9, 2011 6. 6 November 9, 2011 7. 7 November 9, 20111.2 Cc nh lut quang in Tns bc x chiu ti b mt kim loi phi c gi tr ln hn tn s gii hn, gi tr ny gi l gii hn quang in, gii hn quang in ca mi kim loi khc nhau l khc nhau Vi mt kim loi v chm sng nht nh, cng dng in bo ha t l thun vi cng chm sng ti. ng nng ban u ca cc electron khng ph thuc cng chm sng ti m ch ph thuc tn s bc x chiu ti 8. 1.3 Gii thch nh lut quang in8November 9, 2011 Ccm hnh sng ca nhsng khng th gii thchc hiu ng quang inv cc nh lut quang in Nm 1905, Einstein vitmt bi gii thch v hintng quang in trnAnnalen de Physik. Trongbi vit ny, Einstein sdng m hnh lng t caMax Plank nm 1900 giithch cc hin tng quangin. 9. 9November 9, 2011nh lut 1: Tn s bc x chiu ti b mt kim loi phi c gi tr ln hn giihn quang in 10. 10 November 9, 2011Kim loiBc (Ag)0.260ng (Cu) 0.300Km (Zn)0.350Nhm (Al) 0.360Canxi (Ca)0.430Natri (Na)0.500 Kali (K) 0.530Xesi (Cs) 0.580 11. 11November 9, 2011 nh lut 2 : Cng dng quang in bo ha t l thun vi cng chm sng ti.Mi electron ch nhn mt lng t nng lng(photon) nn s quang electron bt ra khi b mtcathode t l thun vi s photon p vo mtcathode trong thi gian 12. 12 November 9, 2011nh lut 3: ng nng ban u ca quang electronkhng ph thuc cng chm sng chiu ti m chph thuc vo tn s ca chm sng ti 13. 13 November 9, 20111.4 Hiu ng quang in trongHin tng to thnh cc electron dn vo ltrng bn trong bn dn, do tc dng ca nhsng c bc sng thch hp gi l hin tngquang in trong. 14. 14 November 9, 2011 15. 15November 9, 2011Quang dnHin tng quang dn l hin tng gim intr sut, tc tng dn in ca bn dn khic nh sng thch hp chiu voGii hn quang in ca mt s bn dn Cht Ge1.88Si 1.11 PbS 4.14 CdS 0.90PbSe 5.65 16. 16November 9, 20111.5 ng dng ca hiu ng quang in Quang tr (photoregistor.) 17. 17 November 9, 2011 18. November 9, 2011Start BeanNo cut? YesOpenWait 10sTia Closeb ct! 19. 19 November 9, 2011Cu to pin mt tri 20. 20November 9, 2011Cm bin ca my nh (CCD, CMOS) Cu to ca cm bin my nh. 21. 21 November 9, 20111.5 ng dng hiu ng quang in 22. 2.1 Gii thiu v Led!22 November 9, 2011Led c pht minh nh th no? Nm 1907 H.J. Round lm th nghim v diod pht sng vi SiC, sau nh khoa hc Nga Oleg Vladimirovich Losev to ra LED u tin.H.J.Round (1881-1966) 23. 23November 9, 2011Gii thiu v LED LED (Light-Emiting Diode),cn gi l diode pht quang,l mt linh kin bn dnLEDsng. pht l g? 24. 24 November 9, 20112.2 Cu to v nguyn l hotng ca LEDLED thc cht l mt diode vi 2 lp bn dn pv n ghp vo nhau. 25. 25 November 9, 2011Quy cch ng gi n led kiu 5mm 26. 26November 9, 2011 Bng led thng thng c 2 loi : Mini Power Led : Cng sut nh hn0.5W High Power Led : Cng sut ln hn0.5 W (0.5W,1W,2W..) Mt b n led c cu to t nhngbng led nh, cc bng lin kt vi nhauqua mt bo mch in t bo mch cchc nng cung cp ngun v tn hiuiu khin cho bng n led. 27. 27 November 9, 2011B N LEDMt b n led c cu to t nhng bng led nh, cc bnglin kt vi nhau qua mt bo mch in t bo mch c chcnng cung cp ngun v tn hiu iu khin cho bng n led. 28. 28November 9, 2011S lc v diode Diode l mt thit b bn dn ch cho dng in i theo mt chiu da trn s hot ng ca lp tip gip p-n 29. 29November 9, 2011 Khi diode c phn cc thun, cc ht mang inKhi diode c phn cc nghch, cc ht mangd dng itip gip gip p-n, cho php dng in Lp qua lp tip P-N hnh thnhin khng th i qua lp tip gip p-n nn khng i quac dng in qua diode 30. 30 November 9, 2011Nguyn l to ra nh sng ca LED 31. 31 November 9, 2011 32. 32 November 9, 2011 33. 33November 9, 2011 Vy theo nguyn l th LED c th pht ra nh sngtrng khng? LED trng hot ng nh no? => Theo nguyn l th LED khng th to ra nh sngtrng v s h mc nng lng ca electron ch to raphoton c tn s nht nh. => LED trng pht ra nh sng trng l nh s t hp 3nh sng -Lc-Lam (RGB) theo nguyn tc phi mupht x, hoc c th to ra nh sng mu trng theonguyn tc quang pht quang (ging nh n hunhquang) bng cch ph ln bng LED UV mt lp vt liuhunh quang! 34. 34 November 9, 2011Phng php mi trong sx led xanh lc Gn y pht trin mt pp mi sn xut n led nh sngxanh vi hiu sut nh sng cnng ln rt nhiu ln Bng cch khc axit mt ngvi kch thc nano trn b mtgia phn bng ngc bch vlp gali nito ca n led c thpht ra nh sng xanh, khi phttrin loi n led xanh l cy smang n mt thit b mi vinng sut cao hn, chiu sng tthn. 35. Mt s loi n LED 35 November 9, 2011RGB led 36. 36 November 9, 20112.3 u im- Nhc im ca led u im Hiu sut cao Mu sc ti Nh gn Thi gian p ng nhanh S dng linh hot ( sng/m, tp trung) bn cao (kh v, tui th 50 000h, t trc trc) Thn thin vi mi trng 37. 37 November 9, 2011Nhc im Gi thnh ban u cao Tui th ph thuc nhit D b nh thng bi in th cao v ch cho dng in i qua theo 1 chiu 38. 38 November 9, 20112.4 ng dng ca n ledV Chiu sng u im nn c dng rt nhiu c nhiu 39. Dng lm n bo hiu39 November 9, 2011 n sng mn giao thng n bo ngunn phanh 40. Dng trong trang tr 40 November 9, 2011 41. 41 November 9, 2011Led 7 on Thi trang led Led TV 42. 42 n soi tin gi 9, 2011November dng led UV Cng IrDA ng dng ca led ph hngngoi v t ngoiCamera nhn mvi led hng ngoiMy in sy kh mc bngLED UV 43. 43 November 9, 2011 Tng lai ca cng ngh led Hnh nh clip led ca X2000 Khi ch gom sng lc chiu ln tngn pin t vX2000 dngLed chip Cu to LED cng sut cao (HPLED) 44. 2.5 Th h k tha ca LED: OLED 44 November 9, 2011(Oranic LED - diode pht quang hu c) OLED l cng ngh led dng vt liu hu c gia 2 incc to ra nh sng V s dng vt liu hu c nn OLED c nhng c tnhm LED khng th c nh: Nh hn Do hn Mng hn Trong sut Vt liu d to ra hn 45. 45 November 9, 2011Mt vi cng ngh OLEDOLED ma trn th ng (passive-matrix OLED-PMLED)OLED ma trn ch ng (active-matrix OLED-AMOLED)OLED trong sut (transparent OLED)OLED pht sng nh (top-emitting OLED)OLED gp c (foldable OLED-FOLED)OLED trng (white OLED) 46. 46November 9, 2011T liu tham kho:Vi s thc hin ca:Howstuffworks.comTrnh Minh TngDesignrecycleinc.comWikipedia.orgL Quang Tu Nguyn Th Thanh TuynElectronicsweekly.comCng nhiu Trn Vn Trngsite v forum khcDisigned by [email protected] 47. 47 November 9, 2011