Mefuta e tšoeu ea LED: Litsela tse kholo tsa tekheniki tsa LED e tšoeu bakeng sa mabone ke: ① Blue LED + mofuta oa phosphor;②Mofuta oa LED oa RGB;③ Ultraviolet LED + mofuta oa phosphor.

1. Leseli le leputsoa - LED chip + mofuta oa phosphor o mosehla o motala o kenyelletsang mefuta e mengata ea mefuta e mengata ea phosphor le mefuta e meng.

Lera la phosphor le botala bo bosehla le monya karolo ea leseli le leputsoa ho tsoa ho chip ea LED ho hlahisa photoluminescence.Karolo e 'ngoe ea leseli le leputsoa le tsoang ho chip ea LED e fetisoa ka lera la phosphor ebe e kopana le leseli le botala bo bosehla bo hlahisoang ke phosphor libakeng tse sa tšoaneng sebakeng.Mabone a khubelu, a matala le a maputsoa a tsoakane ho etsa khanya e tšoeu;Ka mokhoa ona, boleng bo phahameng ka ho fetisisa ba theory ea phosphor photoluminescence phetolo ea katleho, e 'ngoe ea matla a ka ntle a quantum, e ke ke ea feta 75%;'me tekanyo e phahameng ka ho fetisisa ea ho ntša leseli ho tloha ho chip e ka fihla feela hoo e ka bang 70%.Ka hona, ka khopolo, lebone le lesoeu la mofuta o moputsoa Matla a holimo a khanyang a LED a ke ke a feta 340 Lm/W.Lilemong tse 'maloa tse fetileng, CREE e fihlile ho 303Lm/W.Haeba liphetho tsa liteko li nepahetse, ho loketse ho keteka.

2. Bofubelu, botala le boputsoa tse tharo tsa mantlha tsa motsoako oa mebalaMefuta ea LED ea RGBkenyeletsaRGBW- Mefuta ea LED, joalo-joalo.

R-LED (khubelu) + G-LED (e tala) + B-LED (putsoa) li-diode tse tharo tse ntšang khanya li kopantsoe hammoho, 'me mebala e meraro ea mantlha ea khanya e khubelu, e tala le e putsoa e hlahisoang e tsoakoa ka kotloloho sebakeng hore e be tšoeu. kganya.E le ho hlahisa khanya e tšoeu e sebetsang hantle ka tsela ena, pele ho tsohle, li-LED tsa mebala e sa tšoaneng, haholo-holo li-LED tse tala, li tlameha ho ba mehloli ea leseli e sebetsang hantle.Sena se ka bonoa tabeng ea hore leseli le letala le etsa hoo e ka bang 69% ea "isoenergy white light".Hona joale, bokhoni bo khanyang ba li-LED tse putsoa le tse khubelu bo phahame haholo, ka matla a ka hare a quantum a fetang 90% le 95% ka ho latellana, empa katleho ea ka hare ea li-LED tse tala e saletse morao haholo.Ketsahalo ena ea khanya e tlase ea khanya e tlase ea li-LED tse thehiloeng ho GaN e bitsoa "lekhalo la khanya e tala."Lebaka le ka sehloohong ke hore li-LED tse tala ha li e-s'o fumane lisebelisoa tsa tsona tsa epitaxial.Lisebelisoa tse teng tsa phosphorus arsenic nitride li na le ts'ebetso e tlase haholo mofuteng o mosehla oa botala.Leha ho le joalo, ho sebelisa lisebelisoa tsa epitaxial tse khubelu kapa tse putsoa ho etsa li-LED tse tala tla Tlas'a maemo a tlaase a tlaase a hona joale, hobane ha ho na tahlehelo ea phetoho ea phosphor, LED e tala e na le bokhoni bo phahameng bo khanyang ho feta leseli le leputsoa + la phosphor.Ho tlalehoa hore katleho ea eona e khanyang e fihla ho 291Lm / W tlas'a boemo ba hona joale ba 1mA.Leha ho le joalo, ts'ebetso e khanyang ea khanya e tala e bakoang ke phello ea Droop e theoha haholo maqhubung a maholo.Ha boima ba hona joale bo eketseha, bokhoni bo khanyang bo theoha ka potlako.Ho 350mA hajoale, katleho e khanyang ke 108Lm/W.Tlas'a maemo a 1A, katleho e khanyang ea fokotseha.ho isa ho 66Lm/W.

Bakeng sa li-phosphides tsa Sehlopha sa III, ho khantša leseli ka har'a sehlopha se setala ho fetohile tšitiso ea mantlha bakeng sa litsamaiso tsa lintho tse bonahalang.Ho fetola sebopeho sa AlInGaP hore e ntše botala ho fapana le bofubelu, lamunu kapa bosehla bo fella ka ho koalloa ho sa lekana ha mopalami ka lebaka la lekhalo le batlang le le tlase la matla a sistimi ea thepa, e thibelang ho kopanya mahlaseli a sebetsang hantle.

Ka lehlakoreng le leng, ho thata haholo ho III-nitride ho finyella katleho e phahameng, empa mathata a ke ke a hlōloa.Ho sebelisa tsamaiso ena, ho atolosa leseli ho sehlopha sa khanya e tala, lintlha tse peli tse tla etsa hore ho fokotsehe ha ts'ebetso ke: ho fokotseha ha matla a ka ntle a quantum le matla a motlakase.Ho fokotseha ha katleho ea bokantle ba kantle ho tsoa tabeng ea hore le hoja lekhalo la lihlopha tse tala li le tlase, li-LED tse tala li sebelisa matla a holimo a GaN, e leng se etsang hore sekhahla sa phetoho ea matla se fokotsehe.Phoso ea bobeli ke hore LED e tala e ea fokotseha ha sekhahla sa ente se ntse se eketseha mme se ts'oaroa ke phello ea droop.Phello ea Droop e boetse e hlaha ka li-LED tse putsoa, ​​​​empa phello ea eona e kholo ho li-LED tse tala, e leng se bakang ts'ebetso e tlase e tloaelehileng ea ts'ebetso ea hona joale.Leha ho le joalo, ho na le likhopolo-taba tse ngata mabapi le lisosa tsa phello ea droop, eseng feela Auger recombination - li kenyelletsa dislocation, carrier overflow kapa electron leakage.Ea ho qetela e ntlafatsoa ke sebaka se phahameng sa motlakase se ka hare sa motlakase.

Ka hona, mokhoa oa ho ntlafatsa katleho ea khanya ea li-LED tse tala: ka lehlakoreng le leng, ithute mokhoa oa ho fokotsa phello ea Droop tlas'a maemo a lisebelisoa tsa epitaxial tse teng ho ntlafatsa bokhoni ba leseli;ka lehlakoreng le leng, sebelisa phetoho ea photoluminescence ea li-LED tse putsoa le li-phosphors tse tala ho ntša khanya e tala.Mokhoa ona o ka fumana khanya e tala e sebetsang hantle haholo, eo ka khopolo e ka finyellang khanya e phahameng ho feta ea hona joale e tšoeu.Ke khanya e tala e sa itleleng feela, 'me ho fokotseha ha bohloeki ba mebala ho bakoang ke ho pharalla ha eona ha ho ratehe bakeng sa lipontšo, empa ha hoa tšoanela batho ba tloaelehileng.Ha ho na bothata ba ho khantša.Tšebeliso ea khanya e tala e fumanoang ke mokhoa ona e na le monyetla oa ho ba moholo ho feta 340 Lm / W, empa e ntse e ke ke ea feta 340 Lm / W ka mor'a ho kopanya le leseli le lesoeu.Taba ea boraro, tsoela pele ho etsa lipatlisiso le ho fumana lisebelisoa tsa hau tsa epitaxial.Ke ka tsela ena feela, ho na le tlhase ea tšepo.Ka ho fumana leseli le letala le phahameng ho feta 340 Lm/w, leseli le lesoeu le kopantsoeng ke li-LED tse tharo tsa mantlha tsa mebala e khubelu, e tala le e putsoa e ka ba holimo ho feta moeli oa katleho o khanyang oa 340 Lm/w oa li-blue chip-type white light light LEDs. .W.

3. Leseli la ultravioletchip + mebala e meraro ea mantlha ea phosphors e ntša leseli.

Bothata bo ka sehloohong ba mefuta e 'meli e ka holimo ea li-LED tse tšoeu ke kabo e sa lekaneng ea sebaka sa khanya le chromaticity.Leseli la ultraviolet le ke ke la bonoa ka leihlo la motho.Ka hona, ka mor'a hore lebone la ultraviolet le tsoe ka har'a chip, le monngoa ke li-phosphor tse tharo tse ka sehloohong tse ka har'a sephutheloana sa liphutheloana, 'me le fetoloa leseli le lesoeu ka photoluminescence ea phosphors, ebe le kenngoa sebakeng.Ena ke molemo oa eona o moholo, joalo ka mabone a setso a fluorescent, ha e na ho se lekane ha 'mala oa sebaka.Leha ho le joalo, matla a theoretical light a ultraviolet chip white light LED a ke ke a ba holimo ho feta boleng ba theory ea blue chip white light, re se re sa re letho ka boleng ba theory ea RGB white light.Leha ho le joalo, ke feela ka nts'etsopele ea li-phosphor tsa mebala e meraro ea mantlha tse loketseng ho hlasimolla ha ultraviolet re ka fumanang li-LED tse tšoeu tsa ultraviolet tse haufi kapa tse sebetsang hantle ho feta tse peli tse tšoeu tsa LED mothating ona.Ha li le haufi le li-LED tsa ultraviolet tse putsoa, ​​ho na le monyetla o moholo oa hore li.Ha e le kholoanyane, li-LED tse tšoeu tsa mofuta oa maqhubu a mahareng le maqhubu a makhutšoane ha li khonehe.