Farar LED iri: Babban hanyoyin fasaha na farin LED don haskakawa sune: ① Blue LED + nau'in phosphor;②RGB LED irin;③ Ultraviolet LED + nau'in phosphor.

1. Blue haske - LED guntu + rawaya-kore phosphor nau'in ciki har da Multi-launi phosphor Kalam da sauran iri.

Layin phosphor mai launin rawaya-kore yana ɗaukar ɓangaren hasken shuɗi daga guntuwar LED don samar da haske mai haske.Sauran ɓangaren hasken shuɗi daga guntu na LED ana watsa shi ta cikin Layer na phosphor kuma yana haɗuwa da hasken rawaya-koren da phosphor ke fitarwa a wurare daban-daban a sararin samaniya.Fitilolin ja, kore da shuɗi suna gauraye su zama farin haske;A cikin wannan hanyar, mafi girman darajar ka'idar phosphor photoluminescence ingantaccen juzu'i, ɗayan ingantaccen ƙididdigewa na waje, ba zai wuce 75% ba;kuma matsakaicin adadin hakar haske daga guntu zai iya kaiwa kusan 70%.Saboda haka, bisa ka'ida, haske mai launin shuɗi-nau'in haske Matsakaicin ingantaccen hasken LED ba zai wuce 340 Lm/W ba.A cikin 'yan shekarun da suka gabata, CREE ya kai 303Lm/W.Idan sakamakon gwajin daidai ne, yana da daraja a yi bikin.

2. Ja, kore da shudi uku na farko launi hadeRGB LED irihada daRGBW- LED iri, da dai sauransu.

R-LED (ja) + G-LED (kore) + B-LED (blue) diodes masu fitar da haske guda uku an haɗa su tare, kuma launuka uku na farko na ja, kore da shuɗin haske waɗanda ke fitowa ana gauraye su kai tsaye a sararin samaniya don zama fari. haske.Domin samar da farin haske mai inganci ta wannan hanya, da farko, LEDs masu launuka daban-daban, musamman koren ledoji, dole ne su kasance masu ingantattun hanyoyin haske.Ana iya ganin wannan daga gaskiyar cewa hasken kore yana lissafin kusan kashi 69% na "hasken farin isoenergy".A halin yanzu, ingancin haske na shuɗi da jajayen LEDs ya yi girma sosai, tare da ƙimar ƙididdigewa na ciki ya wuce 90% da 95% bi da bi, amma ingancin ƙididdige ƙididdigewa na LED LEDs ya yi nisa a baya.Wannan al'amari na ƙarancin haske mai ƙarancin haske na LEDs na tushen GaN ana kiransa "rabin haske kore."Babban dalili shi ne cewa koren LEDs ba su sami kayan aikin epitaxial na kansu ba.Abubuwan da ake da su na phosphorus arsenic nitride suna da ƙarancin inganci a cikin kewayon bakan launin rawaya-kore.Koyaya, ta amfani da kayan epitaxial ja ko shuɗi don yin LEDs kore za su Ƙarƙashin ƙananan yanayin yawa na yanzu, saboda babu asarar canjin phosphor, koren LED yana da ingantaccen haske fiye da shuɗi + phosphor koren haske.An ba da rahoton cewa ingancinsa mai haske ya kai 291Lm/W ƙarƙashin yanayin 1mA na yanzu.Koyaya, ingantaccen ingantaccen hasken kore wanda tasirin Droop ya haifar yana raguwa sosai a manyan igiyoyin ruwa.Lokacin da yawa na yanzu ya ƙaru, ƙarfin haske yana raguwa da sauri.A halin yanzu 350mA, ingantaccen ingantaccen haske shine 108Lm/W.A ƙarƙashin sharuɗɗan 1A, ƙarfin haske yana raguwa.da 66lm/W.

Ga rukuni na III phosphides, fitar da haske cikin koren band ya zama babban cikas ga tsarin kayan aiki.Canza abun da ke ciki na AlInGaP ta yadda zai fitar da kore maimakon ja, lemu ko rawaya yana haifar da rashin isassun tsarewar jigilar kaya saboda ƙarancin tazarar kuzarin tsarin kayan, wanda ke hana ingantaccen haɗaɗɗun haske.

Sabanin haka, yana da wahala ga III-nitrides don cimma babban inganci, amma matsalolin ba su da ƙarfi.Yin amfani da wannan tsarin, ƙaddamar da hasken zuwa bandeji mai haske, abubuwa biyu da za su haifar da raguwar inganci su ne: raguwar ƙimar ƙididdigewa na waje da ƙarfin lantarki.Rage haɓakar ƙimar ƙididdigewa na waje ya fito ne daga gaskiyar cewa ko da yake ratar band ɗin kore ya ragu, koren LEDs suna amfani da ƙarfin ƙarfin gaba mai girma na GaN, wanda ke haifar da canjin canjin wutar lantarki ya ragu.Rashin hasara na biyu shine cewa koren LED yana raguwa yayin da yawan allura na yanzu ya karu kuma sakamakon faduwa ya kama shi.Har ila yau, tasirin Droop yana faruwa a cikin LED masu launin shuɗi, amma tasirin sa ya fi girma a cikin koren LEDs, yana haifar da ƙananan aiki na yau da kullum.Koyaya, akwai hasashe da yawa game da abubuwan da ke haifar da faɗuwar tasirin, ba kawai sake haɗuwa da Auger ba - sun haɗa da tarwatsewa, ambaliya mai ɗaukar kaya ko ɗigon lantarki.Ƙarshen yana haɓaka ta hanyar babban ƙarfin lantarki na ciki.

Sabili da haka, hanyar da za a inganta ingantaccen haske na LED LEDs: a gefe guda, nazarin yadda za a rage tasirin Droop a ƙarƙashin yanayin kayan epitaxial na yanzu don inganta ingantaccen haske;a daya hannun, yi amfani da photoluminescence canza launi na blue LEDs da koren phosphor don fitar da koren haske.Wannan hanya na iya samun haske mai inganci mai inganci, wanda bisa ka'ida zai iya cimma ingantaccen haske fiye da farin haske na yanzu.Hasken koren ba na kwatsam ba ne, kuma raguwar tsaftar launi da ke haifar da faɗuwar sa ba ta da kyau ga nuni, amma bai dace da talakawa ba.Babu matsala ga haske.Ingancin hasken kore da aka samu ta wannan hanyar yana da yuwuwar kasancewa mafi girma fiye da 340 Lm/W, amma har yanzu ba zai wuce 340 Lm/W ba bayan haɗawa da farin haske.Na uku, ci gaba da bincike da nemo kayan aikin epitaxial na ku.Ta wannan hanyar kawai, akwai ƙyalli na bege.Ta hanyar samun hasken kore wanda ya fi 340 Lm/w, farin farin haɗe da manyan LEDs masu launi guda uku na ja, kore da shuɗi na iya zama mafi girma fiye da ƙimar ingantaccen haske na 340 Lm/w na shuɗi-nau'in farin haske LEDs. .W.

3. Ultraviolet LEDguntu + phosphor kala uku na farko suna fitar da haske.

Babban lahani na waɗannan nau'ikan fararen LEDs guda biyu na sama shine rashin daidaituwa rarraba sarari na haske da chromaticity.Idon mutum ba zai iya gane hasken ultraviolet ba.Saboda haka, bayan hasken ultraviolet ya fita daga guntu, sai ya zama nau'in nau'in phosphor uku na farko a cikin marufi, kuma yana canza shi zuwa haske mai haske ta hanyar photoluminescence na phosphors, sannan kuma ya fita zuwa sararin samaniya.Wannan ita ce babbar fa'idarsa, kamar fitilun fitilu na gargajiya, ba shi da rashin daidaituwar launi na sarari.Koyaya, ingantaccen haske na ka'idar ultraviolet guntu farin haske LED ba zai iya zama sama da ƙimar ka'idar shuɗi guntu farin haske ba, balle ƙimar ƙimar farin haske na RGB.Koyaya, ta hanyar haɓaka phosphor masu inganci masu inganci uku-primary da ke dacewa da tashin hankali na ultraviolet za mu iya samun LEDs fararen ultraviolet waɗanda ke kusa ko ma fi inganci fiye da na sama biyu fararen LEDs a wannan matakin.Mafi kusa da blue ultraviolet LEDs sune, mafi kusantar su.Mafi girma shi ne, matsakaici-kalaman da kuma gajere nau'in UV irin farin LEDs ba zai yiwu ba.