1. Buluu LED Chip + yellow wobiriwira phosphor, kuphatikizapo polychrome phosphor zotumphukira

Mtundu wachikasu wobiriwira wa phosphor umatenga kuwala kwa buluu kwa enaLED chipskupanga photoluminescence, ndi kuwala kwa buluu kuchokera ku tchipisi ta LED kumachokera ku phosphor wosanjikiza ndikusintha ndi kuwala kwachikasu kobiriwira komwe kumatulutsa phosphor kumalo osiyanasiyana mumlengalenga, ndipo kuwala kobiriwira kobiriwira kumasakanikirana kuti apange kuwala koyera; Mwanjira iyi, kuchuluka kwazambiri zongoyerekeza za kutembenuka kwa photoluminescence kwa phosphor, imodzi mwazabwino zakunja kwachulukidwe, sikudutsa 75%; Kuwala kwapamwamba kwambiri kuchokera ku chip kumatha kufika pafupifupi 70%. Chifukwa chake, mongoyerekeza, kuwala kokwanira kwa kuwala koyera kwa buluu sikudutsa 340 Lm/W, ndipo CREE idzafika 303 Lm/W zaka zingapo zapitazo. Ngati zotsatira za mayeso ndi zolondola, ndi bwino kukondwerera.

2. Red wobiriwira buluu atatu choyambirira mtundu kuphatikiza RGB LED mtundu, kuphatikizapo RGB W LED mtundu, etc

Atatuwokuwalama diode, R-LED (wofiira) + G-LED (wobiriwira) + B-LED (buluu), amaphatikizidwa kuti apange kuwala koyera mwa kusakaniza mwachindunji kuwala kofiira, kobiriwira ndi buluu komwe kumatulutsa mumlengalenga. Kuti apange kuwala koyera kowala kwambiri motere, choyamba, ma LED amitundu yonse, makamaka ma LED obiriwira, ayenera kukhala owunikira bwino, omwe amawerengera pafupifupi 69% ya "kuwala kofanana kwamphamvu koyera". Pakalipano, kuwala kwa buluu wa buluu ndi LED yofiira kwakhala kokwera kwambiri, ndi mphamvu yamkati ya quantum yoposa 90% ndi 95% motsatira, koma mphamvu yamkati yamtundu wa LED yobiriwira ili kumbuyo kwambiri. Chodabwitsa ichi cha kuwala kochepa kobiriwira kwa GaN based LED kumatchedwa "green light gap". Chifukwa chachikulu ndikuti LED yobiriwira sinapezebe zinthu zake za epitaxial. Kuchita bwino kwa zida zomwe zilipo kale za phosphorous arsenic nitride ndizochepa kwambiri mumtundu wachikasu wobiriwira wa chromatographic. Komabe, LED yobiriwira imapangidwa ndi kuwala kofiira kapena buluu kuwala kwa epitaxial zipangizo. Pansi pa kachulukidwe kakang'ono kamakono, chifukwa palibe kutayika kwa phosphor, kuwala kobiriwira kwa LED kumakhala ndi kuwala kowala kwambiri kuposa kuwala kwa buluu + phosphor wobiriwira. Akuti kuwala kwake kowala kumafika pa 291Lm/W pansi pa 1mA pano. Komabe, pansi pamakono apamwamba, kuwala kowala kwa kuwala kobiriwira komwe kumayambitsidwa ndi Droop effect kumachepa kwambiri. Pamene kachulukidwe panopa ukuwonjezeka, dzuwa kuwala amachepetsa mofulumira. Pansi pa 350mA pano, kuwala kowala ndi 108Lm/W, ndipo pansi pa chikhalidwe cha 1A, kuwala kowala kumatsika mpaka 66Lm/W.

Kwa maphosfide a gulu la III, kutulutsa kuwala ku gulu lobiriwira kwakhala chopinga chachikulu cha dongosolo lazinthu. Kusintha kapangidwe ka AlInGaP kotero kuti imatulutsa kuwala kobiriwira m'malo mofiira, lalanje kapena chikasu - kuchititsa kuchepa kwa chonyamulira chosakwanira chifukwa cha kuchepa kwamphamvu kwa dongosolo lazinthu, zomwe zimalepheretsa kuyanjananso kwa radiation.

Mosiyana ndi zimenezi, zimakhala zovuta kwambiri kuti nitrides ya Gulu III ikwaniritse bwino kwambiri, koma vuto silingatheke. Kuwala kukakhala kowonjezera ku gulu la kuwala kobiriwira ndi dongosololi, zinthu ziwiri zomwe zidzachepetse mphamvu ndizokwanira kunja kwa quantum ndi mphamvu zamagetsi. Kuchepa kwa magwiridwe antchito akunja kumachokera ku mfundo yakuti ngakhale kusiyana kwa gulu lobiriwira kumakhala kotsika, kuwala kobiriwira kwa LED kumagwiritsa ntchito magetsi apamwamba a GaN, omwe amachepetsa kutembenuka kwa mphamvu. Choyipa chachiwiri ndi chobiriwirachoLED imachepandi kuwonjezeka kwa kachulukidwe ka jekeseni ndipo amagwidwa ndi droop effect. Droop effect imawonekanso mumtundu wa buluu wa LED, koma ndiyowopsa kwambiri mu LED yobiriwira, zomwe zimapangitsa kuchepa kwa magwiridwe antchito wamba. Komabe, pali zifukwa zambiri droop zotsatira, osati Auger recombination, komanso dislocation, chonyamulira kusefukira kapena kutayikira zamagetsi. Zotsirizirazi zimakulitsidwa ndi gawo lamagetsi lamkati lamagetsi.

Chifukwa chake, njira zosinthira kuwala kowala kwa LED yobiriwira: mbali imodzi, phunzirani momwe mungachepetsere mphamvu ya Droop kuti muwongolere kuwala kowala pansi pazida zomwe zilipo kale; Kumbali inayi, buluu la LED kuphatikiza phosphor wobiriwira amagwiritsidwa ntchito kutembenuka kwa photoluminescence kuti atulutse kuwala kobiriwira. Njirayi imatha kupeza kuwala kobiriwira ndi kuwala kowala kwambiri, komwe mwalingaliro kumatha kukwaniritsa kuwala kowala kwambiri kuposa kuwala koyera komweko. Ndi ya kuwala kobiriwira kodziwikiratu. Kutsika koyera kwamtundu komwe kumachitika chifukwa chakukula kwake sikoyenera kuwonetsedwa, koma palibe vuto pakuwunikira wamba. Ndizotheka kupeza kuwala kobiriwira kokulirapo kuposa 340 Lm/W, Komabe, kuwala kophatikizana koyera sikudutsa 340 Lm/W; Chachitatu, pitirizani kufufuza ndikupeza zipangizo zanu za epitaxial. Pokhapokha pangakhale kuwala kwa chiyembekezo kuti mutapeza kuwala kobiriwira kwambiri kuposa 340 Lm/w, kuwala koyera pamodzi ndi ma LED ofiira, obiriwira ndi a buluu amitundu itatu yamtundu wamtundu wamtundu wa LED akhoza kukhala apamwamba kuposa malire a kuwala kwa chip blue. LED yoyera ya 340 Lm/W.

3. Ultraviolet LED chip + tri color phosphor

Choyipa chachikulu cha mitundu iwiri yomwe ili pamwambayi ya LED yoyera ndikuti kugawa kwapang'onopang'ono kwa kuwala ndi chroma sikufanana. Kuwala kwa UV sikuoneka ndi maso. Chifukwa chake, kuwala kwa UV komwe kumachokera ku chip kumatengedwa ndi phosphor yamtundu wa tri color of the package layer, kenako kusinthidwa kuchokera ku photoluminescence ya phosphor kupita ku kuwala koyera ndikutulutsa mumlengalenga. Uwu ndiye mwayi wake waukulu, monga nyali yachikhalidwe ya fulorosenti, ilibe mtundu wosiyana wa danga. Komabe, kuwunikira kowoneka bwino kwa mtundu wa ultraviolet chip mtundu woyera wa LED sikungakhale kokwera kuposa mtengo woyerekeza wa kuwala koyera kwa mtundu wa blue chip, osasiyapo mtengo woyerekeza wa kuwala koyera kwa mtundu wa RGB. Komabe, pokhapokha popanga maphosphor amtundu wa tricolor oyenerera kutulutsa kuwala kwa UV ndizotheka kupeza ultraviolet yoyera ya LED yokhala ndi kuwala kofanana kapena kopambana kuposa ma LED awiri oyera omwe tawatchula pamwambapa. Kuyandikira kwa kuwala kwa ultraviolet LED ndi kuwala kwa buluu, kumakhala kowonjezereka, ndipo kuwala koyera kwa LED kokhala ndi mafunde apakatikati ndi mizere yayifupi ya ultraviolet sikutheka.