Kuwunika kwa njira zazikulu zamaukadaulo zama LED oyera pakuwunikira
Mitundu yoyera ya LED: Njira zazikulu zamakono zowunikira ma LED oyera ndi: 1 buluu LED + mtundu wa phosphor; 2RGB mtundu wa LED; 3 ultraviolet LED + mtundu wa phosphor
1. Chip chabuluu-LED + mtundu wa phosphor wachikasu wobiriwira umaphatikizapo mitundu yambiri yochokera ku phosphor
Phosphor yachikasu yobiriwira imatenga mbali ya kuwala kwa buluu ya chipangizo cha LED kuti ipange photoluminescence, ndipo mbali ina ya kuwala kwa buluu kuchokera ku chipangizo cha LED kumatulutsa phosphor wosanjikiza ndikusintha ndi kuwala kwachikasu kobiriwira komwe kumatulutsa phosphor pa. mfundo zosiyanasiyana m'mlengalenga, ndi kuwala kofiira, kobiriwira ndi buluu kumasakanikirana kuti apange kuwala koyera; Mwa njira iyi, mtengo wapamwamba kwambiri wa kutembenuka kwa photoluminescence wa mphamvu imodzi ya kunja kwa quantum sichidzapitirira 75%; ndipo kuchuluka kwa chip luminescence kumatha kufika pafupifupi 70%, motero, kuwala kwa buluu kumakhala koyera. Kuwala kwa LED sikungapitirire 340 Lm/W, CREE idafika 303Lm/W m'zaka zam'mbuyomu, ndipo ndikofunikira kukondwerera ngati zotsatira za mayeso zili zolondola.
2, Red, wobiriwira ndi buluu atatu choyambirira mitundu kuphatikiza RGB LED mtundu kuphatikizapo RGBW-LED mtundu, etc.
R-LED (yofiira) + G-LED (yobiriwira) + B- LED (buluu) Ma LED atatu amaphatikizidwa, ndipo kuwala kofiira, kobiriwira ndi buluu kwa mitundu itatu yayikuluyi kumasakanikirana mwachindunji mumlengalenga kuti apange kuwala koyera. Kuti apange kuwala koyera kowoneka bwino motere, choyamba, ma LED amitundu yosiyanasiyana, makamaka ma LED obiriwira, ayenera kukhala magwero owunikira kwambiri, omwe pafupifupi 69% amawonekera kuchokera ku "kuwala koyera". mphamvu ya ma LED a buluu ndi ofiira akhala akukwera kwambiri, ndipo mphamvu yamkati ya quantum ndi yoposa 90% ndi 95%, motero, koma mphamvu ya mkati mwa ma LED obiriwira ndi yotsalira kwambiri. Chodabwitsa kuti kuwala kobiriwira kochokera ku GaN kochokera ku GaN sikuli kothandiza kumatchedwa "gap green light." Chifukwa chachikulu ndi chakuti LED yobiriwira sinapeze epitaxial zinthu zake. Zida zomwe zilipo kale za phosphorous-arsenic nitride zimakhala ndi mphamvu zochepa mumtundu wachikasu-wobiriwira, ndipo kuwala kofiira kapena kuwala kwabuluu epitaxial zinthu zimagwiritsidwa ntchito kupanga LED yobiriwira. Pakuchepa kwa kachulukidwe kakali pano, ma LED obiriwira amakhala ndi kuwala kowala kwambiri kuposa kuwala kwa buluu + phosphor wobiriwira chifukwa chosatayika kutembenuka kwa phosphor. Zimanenedwa kuti kuwala kowala kumafika ku 291 Lm / W pa 1 mA. Komabe, kuwala kwa kuwala kobiriwira komwe kumayambitsidwa ndi zotsatira za Droop kumachepetsedwa kwambiri pakalipano, ndipo pamene kachulukidwe kameneka kakuwonjezeka, mphamvu ya kuwala ndi mofulumira adatchithisira. Pakalipano 350 mA, kuwala kowala ndi 108 Lm/W, ndipo pansi pa chikhalidwe cha 1 A, kuwala kowala kumatsikira ku 66 Lm/W.
Kwa ma phosphides a Gulu la III, kutulutsa kuwala ku gulu lobiriwira kumakhala chotchinga chachikulu kuzinthu zakuthupi. Kusintha kapangidwe ka AlInGaP kumapangitsa kuti ikhale yobiriwira m'malo mofiira, lalanje kapena yachikasu - zomwe zimapangitsa kuti pakhale kutsekeka kosakwanira konyamula katundu chifukwa cha kuchepa kwamphamvu kwa dongosolo lazinthu, ndikuchotsa kuyambiranso kothandiza kwa ma radiation.
Mosiyana ndi zimenezi, nitrides ya Gulu la III ndizovuta kwambiri kukwaniritsa, koma vuto silingatheke. Ndi dongosololi, zinthu ziwiri zomwe zimapangitsa kuti kuchepeko kuchepe chifukwa cha kuwonjezereka kwa kuwala mu gulu lobiriwira ndi: kutulutsa kunja kwa quantum ndi kuwonongeka kwa magetsi. Kuchepa kwa magwiridwe antchito akunja kumabwera chifukwa chakuti kuwala kobiriwira kwa LED kumakhala ndi magetsi opita patsogolo a GaN, zomwe zimapangitsa kuti mphamvu yosinthira mphamvu ikhale yochepa. Choyipa chachiwiri ndichakuti kuwala kwa LED kobiriwira kumachepa pomwe kachulukidwe ka jakisoni akuchulukirachulukira, womwe umagwidwa ndi kutsika. Mphamvu ya Droop imawonekanso mu ma LED a buluu, koma ndiyofunikira kwambiri mu ma LED obiriwira, zomwe zimapangitsa kuti mafunde apansi agwire ntchito. Komabe, pali zifukwa zambiri zomwe zimayambitsa droop zotsatira, osati Auger pawiri, komanso misplacement, chonyamulira kusefukira kapena ma elekitironi kutayikira. Zotsirizirazi zimakulitsidwa ndi gawo lamagetsi lamkati lamagetsi.
Choncho, njira yowonjezeretsa kuwala kowala kwa ma LED obiriwira: kumbali imodzi, momwe mungachepetsere mphamvu ya Droop pansi pa zinthu zomwe zilipo epitaxial kuti muwonjezere kuwala; mbali yachiwiri, kutembenuka kwa photoluminescence kwa LED ya buluu kuphatikizapo phosphor yobiriwira imatulutsa kuwala kobiriwira, Njirayi ingapeze kuwala kobiriwira kobiriwira, ndipo mwachidziwitso kungathe kupindula kwambiri kuposa kuwala koyera komweko, komwe kumakhala kuwala kobiriwira kosakhazikika, ndipo kuyera kwamtundu komwe kumachitika chifukwa chakukula kwa mawonekedwe kumachepa, zomwe sizikuwoneka bwino, koma kwa wamba Palibe vuto pakuwunikira. Kuwala kobiriwira komwe kumapezeka ndi njirayi kumakhala ndi kuthekera kopitilira 340 Lm / W, koma sikupitilira 340 Lm / W mutaphatikiza kuwala koyera. Chachitatu, pitirizani kufufuza ndikupeza zinthu zake za epitaxial, kokha Mwa njira iyi, pali chiyembekezo chakuti mwa kupeza kuwala kobiriwira kuposa 340 Lm / w, kuwala koyera pamodzi ndi zofiira, zobiriwira ndi zabuluu ma LED atatu oyambirira akhoza kukhala. apamwamba kuposa malire a kuwala kwa blue chip mtundu woyera LED 340 Lm/W.
3.UV LED chip + atatu pulayimale mtundu phosphor kuwala
Choyipa chachikulu cha ma LED oyera awiri pamwambapa ndikugawa kwamalo kofanana kwa kuwala ndi chromaticity. Kuwala kwa Ultraviolet sikuwoneka ndi maso a munthu. Choncho, kuwala kwa ultraviolet kutulutsidwa kuchokera ku chip, kumatengedwa ndi phosphor yamtundu woyamba wa encapsulating layer, ndipo photoluminescence ya phosphor imasinthidwa kukhala kuwala koyera, komwe kumatulutsidwa mumlengalenga. Uwu ndiye mwayi wake waukulu, monga nyali zachikhalidwe za fulorosenti, ilibe kusalingana kwamitundu. Komabe, kuwala koyerekeza kwa mtundu wa ultraviolet chip mtundu woyera wa LED sikungakhale kokwera kuposa mtengo woyerekeza wa mtundu wa blue chip kuwala koyera, ndipo ndikocheperako kukhala wapamwamba kuposa mtengo woyerekeza wa kuwala koyera kwa mtundu wa RGB. Komabe, ndikungopanga ma phosphor apamwamba kwambiri a trichromatic phosphors oyenera kusangalatsa kwa kuwala kwa ultraviolet kuti n'zotheka kupeza ma LED oyera amtundu wa ultraviolet omwe ali pafupi kapena aluso kwambiri kuposa ma LED awiri oyera apano. Kuyandikira kwa ma LED a buluu a kuwala kwa ultraviolet, kuthekera Kukula kwakukulu kwa mafunde apakati ndi mafunde afupiafupi amtundu wa ultraviolet mtundu wa LED ndi, kosatheka.