Uhlalutyo lweendlela eziphambili zobugcisa kwii-LED ezimhlophe zokukhanyisa
Iintlobo ze-LED ezimhlophe: Iindlela eziphambili zobugcisa kwii-LED ezimhlophe zokukhanyisa zi: I-1 blue LED + uhlobo lwe-phosphor; Uhlobo lwe-2RGB LED; I-3 ye-ultraviolet LED + uhlobo lwe-phosphor
1. Itshiphu ye-Blue-LED + uhlobo lwephosphor etyheli-luhlaza lubandakanya ukuphuma kwephosphor enemibala emininzi
Umaleko we-phosphor otyheli-luhlaza ufunxa inxalenye yokukhanya okuluhlaza kwetshiphu ye-LED ukuvelisa i-photoluminescence, kwaye elinye inxalenye yokukhanya okuluhlaza okwesibhakabhaka ukusuka kwi-chip ye-LED ihambisa umaleko we-phosphor kwaye idibana nokukhanya okutyheli-luhlaza okhutshwa yiphosphor kwi. amanqaku ahlukeneyo kwindawo, kunye nokukhanya okubomvu, okuluhlaza kunye nohlaza okwesibhakabhaka kuxube ukwenza ukukhanya okumhlophe; Ngale ndlela, ixabiso eliphezulu lethiyori ye-photoluminescence yokuguqulwa kokusebenza kakuhle yenye ye-quantum esebenzayo yangaphandle ayiyi kudlula i-75%; kunye nesantya sokutsalwa kwe-chip luminescence sinokufikelela kuphela malunga ne-70%, ngoko ke ithiyori, ukukhanya okuluhlaza okwesibhakabhaka kumhlophe. Ukusebenza kokukhanya kwe-LED akuyi kudlula i-340 Lm / W, i-CREE ifikelele kwi-303Lm / W kwiminyaka edlulileyo, kwaye kuyafaneleka ukubhiyozela ukuba iziphumo zovavanyo zichanekile.
I-2, Ebomvu, eluhlaza kunye nebhlowu idibaniso yemibala emithathu ephambili ye-RGB ye-LED ebandakanya uhlobo lwe-RGBW-LED, njl.
I-R-LED (ebomvu) + G-LED (eluhlaza) + B- I-LED (eluhlaza okwesibhakabhaka) Ii-LED ezintathu zidityanisiwe, kunye nokukhanya okubomvu, okuluhlaza kunye nokuluhlaza kwemibala emithathu ephambili ixutywe ngokuthe ngqo kwisithuba ukwenza ukukhanya okumhlophe. Ukuze kuveliswe ukukhanya okumhlophe okuphezulu ngale ndlela, okokuqala, ii-LED zemibala eyahlukeneyo, ngakumbi ii-LED eziluhlaza, kufuneka zibe yimithombo yokukhanya ephezulu, emalunga ne-69% ebonakalayo "kwi-energy white light". ukusebenza kwe-LED eluhlaza okwesibhakabhaka kunye nobomvu kuye kwaphezulu kakhulu, kwaye ukusebenza kwe-quantum yangaphakathi kungaphezulu kwe-90% kunye ne-95%, ngokulandelanayo, kodwa i-quantum yangaphakathi ye-LED eluhlaza isemva kakhulu. Isenzeko sokuba ukukhanya okuluhlaza okusekwe kwi-GaN okusekwe kwe-LED akusebenzi kakuhle kubizwa ngokuba yi "gap yokukhanya okuluhlaza." Isizathu esona sizathu kukuba i-LED eluhlaza ayizange ifumane izinto zayo ze-epitaxial. Izinto ezikhoyo ze-phosphorous-arsenic nitride series zinokusebenza okuphantsi kwi-spectrum ye-yellow-green spectrum, kunye nokukhanya okubomvu okanye i-blue light epitaxial material isetyenziselwa ukwenza i-LED eluhlaza. Kwiimeko ezisezantsi zokuxinana kwangoku, ii-LED eziluhlaza zinokukhanya okuphezulu kokukhanya kunokukhanya okuluhlaza okwesibhakabhaka + kwephosphor ngenxa yokulahleka kokuguqulwa kwephosphor. Kuxelwa ukuba ukukhanya okukhanyayo kufinyelela kwi-291 Lm / W kwi-1 mA. Nangona kunjalo, umphumo wokukhanya wokukhanya okuluhlaza okubangelwa yi-Droop effect iyancitshiswa kakhulu kumbane omkhulu, kwaye xa ukuxinwa kwangoku kwanda, umphumo wokukhanya yehliswa ngokukhawuleza. Kwixesha langoku le-350 mA, ukukhanya okukhanyayo yi-108 Lm / W, kwaye phantsi kwemeko ye-1 A, ukukhanya okukhanyayo kwehla kwi-66 Lm / W.
Kwi-phosphides yeQela le-III, ukukhutshwa kokukhanya kwibhanti eluhlaza kuba ngumqobo osisiseko kwinkqubo yezinto. Ukutshintsha ukubunjwa kwe-AlInGaP kwenza ukuba kukhanye luhlaza endaweni yobomvu, i-orenji okanye i-yellow-ebangela ukuvalelwa komthwali ngokwaneleyo ngenxa ye-gap yamandla ephantsi kwenkqubo yezinto eziphathekayo, ukuphelisa ukuhlanganiswa okusebenzayo kwe-radiative.
Ngokwahlukileyo, i-nitrides yeQela le-III inzima kakhulu ukuyifumana, kodwa ubunzima abunakugqithiswa. Ngale nkqubo, izinto ezimbini ezibangela ukuba ukusebenza kakuhle kunciphe ngenxa yokwandiswa kokukhanya kwibhanti eluhlaza zezi: ukusebenza kakuhle komthamo wangaphandle kunye nokuthotywa kombane. Ukuncipha kokusebenza komyinge wangaphandle kuphuma kwinto yokuba i-LED eluhlaza inomthamo ophezulu ohamba phambili weGaN, obangela ukuba izinga lokuguqulwa kwamandla lihle. Ububi besibini kukuba i-LED eluhlaza iyancipha njengoko inxinano yangoku yenaliti isanda, ebanjwe yimpembelelo ye-droop. Impembelelo yeDroop ibonakala kwii-LED eziluhlaza okwesibhakabhaka, kodwa ibaluleke ngakumbi kwii-LED eziluhlaza, okukhokelela ekusebenzeni okuphantsi kwemisinga. Nangona kunjalo, kukho izizathu ezininzi zesizathu se-droop effect, kungekhona kuphela i-Auger compound, kodwa kunye nokungahambi kakuhle, ukuphuphuma kwe-carrier okanye ukuvuza kwe-electron. Le yokugqibela iphuculwe ngamandla aphezulu ombane angaphakathi ombane.
Ngoko ke, indlela yokuphucula ukusebenza okukhanyayo kwee-LED eziluhlaza: kwelinye icala, indlela yokunciphisa i-Droop effect phantsi kweemeko ezikhoyo ze-epitaxial zokuphucula ukukhanya; Inkalo yesibini, ukuguqulwa kwe-photoluminescence ye-LED eluhlaza okwesibhakabhaka kunye ne-phosphor eluhlaza ikhupha ukukhanya okuluhlaza, Indlela inokufumana ukukhanya okuluhlaza okuphezulu, kwaye ngokwethiyori inokufikelela phezulu kunokukhanya okumhlophe kwangoku, okukukukhanya okuluhlaza okungekho ngokuzenzekelayo, kunye nokucoceka kombala okubangelwa ukwanda kwe-spectral kuyancipha, okungathandekiyo ukuboniswa, kodwa okuqhelekileyo Akukho ngxaki ngokukhanyisa. Umphumo wokukhanya okuluhlaza ofunyenwe ngale ndlela unamathuba angaphezu kwe-340 Lm / W, kodwa ayikadluli i-340 Lm / W emva kokudibanisa ukukhanya okumhlophe. Okwesithathu, qhubeka nophando kunye nokufumana izinto zayo ze-epitaxial, kuphela Ngale ndlela, kukho ithemba lokuba ngokufumana ukukhanya okuluhlaza ngaphezu kwe-340 Lm / w, ukukhanya okumhlophe kudityaniswe nombala obomvu, oluhlaza kunye nohlaza okwesibhakabhaka ii-LED ezintathu eziphambili zombala iphezulu kunomda wokusebenza kokukhanya kohlobo lwe-blue chip emhlophe ye-LED 340 Lm/W.
I-chip ye-3.UV ye-LED + ukukhanya kwe-phosphor yombala emithathu ephambili
Esona siphene siphambili kwezi zimbini ii-LED ezimhlophe kukwabiwa kwendawo engalinganiyo yokukhanya kunye nechromaticity. Ukukhanya kwe-ultraviolet akubonakali kwiliso lomntu. Ke ngoko, emva kokukhutshwa kokukhanya kwe-ultraviolet kwi-chip, ifunxwa yimibala emithathu ye-phosphors yombala we-encapsulating layer, kwaye i-photoluminescence ye-phosphor iguqulwa ibe kukukhanya okumhlophe, okuye kukhutshwe kwisithuba. Le yeyona nzuzo inkulu, njengezibane zemveli ze-fluorescent, ayinakho ukungalingani kombala wendawo. Nangona kunjalo, isiphumo sokukhanya kwethiyori yohlobo lwe-ultraviolet chip emhlophe ayinakuba phezulu kunexabiso lethiyori yohlobo lwe-blue chip ukukhanya okumhlophe, kwaye ayinakwenzeka ukuba ibe phezulu kunexabiso lethiyori yohlobo lokukhanya okumhlophe kwe-RGB. Nangona kunjalo, kuphela ngokuphuhliswa kwe-phosphors ephezulu ye-trichromatic efanelekileyo kwi-excitation yokukhanya kwe-ultraviolet ukuba kunokwenzeka ukufumana ii-LED ezimhlophe ze-ultraviolet ezikufutshane okanye ezisebenza ngakumbi kune-LED ezimbini ezimhlophe zangoku. Ukusondela kwii-LEDs ze-ultraviolet eziluhlaza okwesibhakabhaka, kunokwenzeka Ukuba ubukhulu be-medium-wave kunye ne-short-wave ye-ultraviolet uhlobo lwe-LED ezimhlophe, akunakwenzeka.