1. Blue LED guntu + rawaya koren phosphor, gami da polychrome phosphor wanda aka samu

Rawan phosphor koren rawaya yana ɗaukar hasken shuɗi na wasuLED kwakwalwan kwamfutadon samar da photoluminescence, kuma shuɗin haske daga kwakwalwan LED yana watsawa daga cikin Layer na phosphor kuma yana haɗuwa tare da hasken kore mai launin rawaya wanda phosphor ke fitarwa a wurare daban-daban a sararin samaniya, kuma launin ja koren shudi yana haɗuwa ya zama farin haske; Ta wannan hanyar, matsakaicin ƙimar ka'idar ingantaccen canjin photoluminescence na phosphor, ɗayan ƙimar ƙimar waje, ba zai wuce 75% ba; Mafi girman adadin haske daga guntu zai iya kaiwa kusan 70%. Saboda haka, bisa ka'ida, matsakaicin ingantaccen haske na haske mai haske mai launin shuɗi ba zai wuce 340 Lm / W ba, kuma CREE zai kai 303 Lm / W 'yan shekaru da suka gabata. Idan sakamakon gwajin daidai ne, yana da daraja a yi bikin.

2. Red kore blue uku primary launi hade RGB LED irin, ciki har da RGB W LED irin, da dai sauransu

Na ukuhaske mai fitarwadiodes, R-LED (ja)+G-LED (kore)+B-LED (blue), an haɗa su don samar da farin haske ta hanyar haɗa hasken ja, kore da shuɗi da ke fitowa a sararin samaniya kai tsaye. Domin samar da babban ingantaccen haske mai haske ta wannan hanyar, da farko, duk LEDs masu launi, musamman koren LEDs, dole ne su kasance ingantaccen tushen hasken wuta, wanda ke lissafin kusan 69% na “daidaitaccen farin haske”. A halin yanzu, ingancin haske na LED mai launin shuɗi da jajayen LED ya yi girma sosai, tare da ƙimar ƙima na cikin gida ya wuce 90% da 95% bi da bi, amma ingancin jimlar ciki na koren LED yana da nisa a baya. Wannan al'amari na ƙarancin haske mai haske na tushen GaN LED ana kiransa "raɓan haske kore". Babban dalili shi ne cewa koren LED bai riga ya samo kayan aikin epitaxial na kansa ba. Ingancin abubuwan da ke akwai na sinadarin phosphorus arsenic nitride yana da ƙasa sosai a cikin kewayon chromatographic kore mai launin rawaya. Koyaya, koren LED an yi shi da jan haske ko shuɗi mai haske epitaxial. A ƙarƙashin yanayin ƙarancin ƙarancin halin yanzu, saboda babu asarar canjin phosphor, koren LED yana da ingantaccen haske fiye da hasken shuɗi + phosphor koren haske. An ba da rahoton cewa ingancinsa mai haske ya kai 291Lm/W a ƙarƙashin halin yanzu na 1mA. Koyaya, a ƙarƙashin babban halin yanzu, ingantaccen ingantaccen hasken kore wanda tasirin Droop ya haifar yana raguwa sosai. Lokacin da yawa na yanzu ya ƙaru, ƙarfin haske yana raguwa da sauri. A ƙarƙashin 350mA halin yanzu, ingantaccen haske shine 108Lm/W, kuma ƙarƙashin yanayin 1A, ingantaccen ingantaccen haske yana raguwa zuwa 66Lm/W.

Ga rukuni na III phosphides, fitar da haske zuwa koren band ya zama babban cikas na tsarin kayan. Canza abun da ke ciki na AlInGaP ta yadda zai fitar da koren haske maimakon ja, lemu ko rawaya - haifar da ƙarancin ƙarancin mai ɗaukar hoto saboda ƙarancin ƙarancin makamashi na tsarin kayan aiki, wanda ke hana haɓakar haɓakar radiation mai inganci.

Sabanin haka, yana da wahala ga rukunin III nitrides don cimma babban aiki, amma wahalar ba ta da ƙarfi. Lokacin da aka shimfiɗa hasken zuwa bandeji mai haske mai launin kore tare da wannan tsarin, abubuwa biyu da za su rage tasirin su ne ƙimar ƙididdiga na waje da ƙarfin lantarki. Rage ƙimar ƙididdige ƙididdigewa na waje ya zo ne daga gaskiyar cewa ko da yake ratar band ɗin kore ya yi ƙasa, koren LED yana amfani da babban ƙarfin wutar lantarki na GaN, wanda ke rage ƙimar juyawar wutar lantarki. Rashin lahani na biyu shine koreLED yana raguwatare da karuwar yawan allura na yanzu kuma an kama shi ta hanyar faɗuwa. Tasirin juzu'i kuma yana bayyana a cikin shuɗi LED, amma ya fi tsanani a cikin koren LED, yana haifar da ƙarancin ingancin aiki na yau da kullun. Koyaya, akwai dalilai da yawa don tasirin faɗuwa, ba kawai sake haɗuwa da Auger ba, har ma da tarwatsewa, ambaliya mai ɗaukar kaya ko ɗigon lantarki. Ƙarshen yana haɓaka ta wurin babban ƙarfin lantarki na ciki.

Sabili da haka, hanyoyin da za a inganta ingantaccen haske na koren LED: a gefe guda, nazarin yadda za a rage tasirin Droop don inganta ingantaccen haske a ƙarƙashin yanayin kayan kayan epitaxial; A gefe guda, ana amfani da LED mai shuɗi tare da koren phosphor don canza hasken haske don fitar da hasken kore. Wannan hanya na iya samun koren haske tare da ingantaccen haske mai haske, wanda bisa ka'ida zai iya samun ingantaccen haske fiye da farin haske na yanzu. Nasa ne na hasken kore maras kwatsam. Rashin tsaftar launi da ke haifarwa ta hanyar faɗaɗawar sa ba shi da daɗi don nunawa, amma ba matsala ga hasken yau da kullun. Yana yiwuwa a sami ingantaccen haske mai haske fiye da 340 Lm / W, Duk da haka, haɗewar farin haske ba zai wuce 340 Lm / W ba; Na uku, ci gaba da bincike da nemo kayan aikin epitaxial na ku. Ta wannan hanyar ne kawai za a iya samun haske na bege cewa bayan samun ƙarin hasken kore fiye da 340 Lm/w, farin hasken da aka haɗe da ja, kore da shuɗi na LEDs masu launi na farko na iya zama mafi girma fiye da iyakar ingancin haske na guntu mai shuɗi. Farar LED na 340Lm/W.

3. Ultraviolet LED guntu + tri launi phosphor

Babban lahani na nau'ikan farin LED na sama shine cewa rarraba sarari na haske da chroma ba daidai ba ne. Hasken UV ba ya iya gani ga idon ɗan adam. Don haka, hasken UV da ke fitowa daga guntu yana ɗaukar phosphor kala uku na marufi, sa'an nan kuma ya juyo daga photoluminescence na phosphor zuwa farin haske kuma yana fitowa cikin sarari. Wannan ita ce babbar fa'idarsa, kamar fitilun gargajiya na gargajiya, ba ta da launi mara daidaituwa. Koyaya, ingantaccen ingantaccen haske na ultraviolet guntu nau'in farin LED ba zai iya zama sama da ƙimar ka'idar blue guntu irin farin haske ba, balle ma ƙimar ka'idar farin haske nau'in RGB. Koyaya, ta hanyar haɓaka ingantattun phosphors masu inganci waɗanda suka dace da haɓakar hasken UV za'a iya yiwuwa a sami farin ultraviolet LED tare da ingantaccen haske mai kama ko ma mafi girma fiye da farar LED guda biyu da aka ambata a sama a wannan matakin. Mafi kusancin LED na ultraviolet yana zuwa haske mai shuɗi, mafi kusantar ya kasance, kuma farin LED mai matsakaicin kalaman da gajeriyar layin ultraviolet ba zai yiwu ba.