Falanqaynta waddooyinka ugu muhiimsan ee farsamada ee LED-yada cad ee nalka
Noocyada LED-yada cad: Wadooyinka farsamada ugu muhiimsan ee LED-yada cad ee nalalka waa: 1 buluug LED + nooca fosfoor; 2RGB nooca LED; 3 ultraviolet LED + nooca fosfoor
1. chip-buluug-LED nooca fosfoorka jaalaha-cagaaran waxaa ku jira soosaar fosfoor oo midabyo badan leh.
Lakabka fosfor ee jaalaha-cagaaran wuxuu nuugaa qayb ka mid ah iftiinka buluugga ah ee chip-ka LED-ka si uu u dhaliyo sawir-qaadis, iyo qaybta kale ee iftiinka buluugga ah ee chip-ka LED-ku wuxuu gudbiyaa lakabka fosfooraska wuxuuna la mid yahay iftiinka jaalaha-cagaaran ee ka soo baxaya fosfoorku at meelo kala duwan oo meel bannaan ah, iyo casaanka, cagaarka iyo iftiinka buluuga ah ayaa isku dhafan si ay u sameeyaan iftiin cad; Sidan, qiimaha aragtida ugu sarreeya ee wax ku oolnimada beddelka photoluminescence ee mid ka mid ah waxtarka tirada dibadda kama badan doono 75%; iyo heerka soo saarida ee luminescence chip gaari karaa oo kaliya ku saabsan 70%, sidaa darteed aragti ahaan, iftiinka buluug waa caddaan. Waxtarka iftiinka LED kama badnaan doono 340 Lm/W, CREE waxay gaartay 303Lm/W sanadihii hore, waxaana mudan in la dabaaldego haddii natiijooyinka imtixaanku ay sax yihiin.
2, Casaan, cagaar iyo buluug saddex midab oo isku dhafan RGB LED nooca oo ay ku jiraan nooca RGBW-LED, iwm.
R-LED (casaan) + G-LED (cagaaran) + B- LED (buluug) Saddexda LED waa la isku daray, iyo casaan, cagaar iyo buluug ee saddexda midab ee aasaasiga ah si toos ah ayaa loogu qasaa meel bannaan si ay u sameeyaan iftiin cad. Si loo soo saaro iftiin cad oo tayo sare leh habkan, marka hore, LEDs midabyo kala duwan, gaar ahaan LEDs cagaaran, waa inay ahaadaan ilo iftiin tayo sare leh, oo qiyaastii 69% laga arki karo "iftiin cad oo tamar ah". waxtarka LED-yada buluuga iyo casaanka ayaa aad u sarreeya, waxtarka tirada gudaha ayaa ka sarreeya 90% iyo 95%, siday u kala horreeyaan, laakiin waxtarka gudaha gudaha ee LED-yada cagaaran ayaa aad uga dambeeya. Ifafaalaha in iftiinka cagaaran ee GaN-ku-saleysan LED uusan ahayn mid hufan waxaa loo yaqaan "farqiga iftiinka cagaaran." Sababta ugu weyn ayaa ah in LED-ga cagaaran uusan helin walxaha epitaxial u gaar ah. Walxaha taxan ee fosfooraska-arsenic nitride ee jira waxay leeyihiin waxtarkoodu hooseeyo ee kala duwanaanshaha jaalaha-cagaaran, iyo nalka cas ama nalka buluuga ah ee epitaxial ayaa loo isticmaalaa si loo sameeyo LED-ga cagaaran. Xaaladaha cufnaanta hoose ee hadda, LED-yada cagaaran waxay leeyihiin waxtarka iftiinka ka sarreeya buluug + phosphor iftiinka cagaaran sababtoo ah ma lumin beddelka fosfooraska. Waxaa lagu soo waramayaa in waxtarka iftiinka uu gaaro 291 Lm / W at 1 mA. Si kastaba ha ahaatee, saameynta iftiinka iftiinka cagaaran ee uu keeno saameynta Droop ayaa si weyn hoos loogu dhigaa qulqul weyn, iyo marka cufnaanta hadda la kordhiyo, saameynta iftiinka si degdeg ah hoos loogu dhigay. Waqtiga xaadirka ah ee 350 mA, waxtarka iftiinka waa 108 Lm/W, iyo xaalada 1 A, waxtarka iftiinka wuxuu hoos ugu dhacayaa 66 Lm/W.
Kooxda III phosphides, iftiiminta iftiinka kooxda cagaaran waxay noqotaa caqabad aasaasi ah oo ku ah nidaamka walxaha. Beddelidda ka kooban AlInGaP waxay ka dhigtaa cagaar dhalaalaysa halkii ay ka ahaan lahayd casaan, oranji ama jaalle — taasoo keenaysa xannibaadda qaadaha oo aan ku filnayn taas oo ay ugu wacan tahay farqiga tamarta yar ee nidaamka walxaha, taasoo meesha ka saaraysa dib-u-habaynta shucaaca ee waxtarka leh.
Taas bedelkeeda, kooxda III nitrides aad bay u adag tahay in la gaaro, laakiin dhibtu maaha mid laga gudbi karo. Nidaamkan, laba arrimood oo keena waxtarka hoos u dhaca sababtoo ah fidinta iftiinka ee qaybta cagaaran waa: waxtarka quantum dibadda iyo hoos u dhaca waxtarka korontada. Hoos u dhaca waxtarka tirada dibadda ayaa ka imanaya xaqiiqda ah in LED-ka cagaaran uu leeyahay koronto hore oo sare oo GaN ah, taas oo keenta in heerka beddelka awoodda hoos u dhaco. Khasaaraha labaad ayaa ah in LED-ka cagaaran uu yaraado marka cufnaanta hadda la isku duro uu kordho, kaas oo ay ku xayiran tahay saameynta hoos u dhaca. Saamaynta Droop waxay sidoo kale ka muuqataa LED-yada buluuga ah, laakiin waxay xitaa aad uga sii muhiimsan tahay LED-yada cagaaran, taasoo keentay hoos u dhaca socodka hawlgalka. Si kastaba ha ahaatee, waxaa jira sababo badan oo sababa hoos u dhaca, ma aha oo kaliya xarunta Auger, laakiin sidoo kale meelaynta khaldan, qulqulka sidaha ama dareeraha elektaroonigga ah. Tan dambe waxaa lagu xoojiyay koronto gudaha ah oo koronto ah.
Sidaa darteed, habka loo wanaajiyo waxtarka iftiinka iftiinka ee LED-yada cagaaran: dhinaca kale, sida loo yareeyo saameynta Droop ee hoos yimaada xaaladaha walxaha epitaxial ee jira si kor loogu qaado iftiinka iftiinka; dhinaca labaad, beddelka photoluminescence ee LED buluug ah oo lagu daray fosfoor cagaaran siidayna iftiin cagaaran, Habka heli kartaa iftiin cagaaran-wax ku ool ah oo sare, iyo aragti ahaan gaari karaa in ka badan saamaynta iftiinka cad hadda, kaas oo iska leh iftiin cagaaran oo aan iskeed ahayn, iyo nadiifnimada midabka ee ay keento fidinta muuqaalka ayaa hoos u dhacda, taas oo aan ku habboonayn soo bandhigida, laakiin kuwa caadiga ah Dhibaato kuma laha iftiinka. Saamaynta iftiinka cagaarka ah ee lagu helo habkani wuxuu leeyahay suurtogalnimada in ka badan 340 Lm / W, laakiin wali kama badna 340 Lm / W ka dib marka la isku daro iftiinka cad. Seddexaad, sii wad cilmi baarista oo aad hesho qalabkeeda epitaxial, kaliya Sidan, waxaa jira rajo ah in la helo iftiin cagaaran oo ka badan 340 Lm / w, iftiinka cad ee casaanka, cagaarka iyo buluugga ah ee saddexda midab ee LEDs ayaa laga yaabaa inay noqdaan. ka sarreeya xadka hufnaanta iftiinka ee nooca chip buluugga cad ee LED 340 Lm / W.
3.UV LED chip + saddex iftiin fosfoor midabka aasaasiga ah
Ciladda ugu weyn ee soo jireenka ah ee labada sare ee LED-yada cad waa qaybinta aan sinnayn ee iftiinka iyo chromaticity. Iftiinka ultraviolet ma arki karo isha aadanaha. Sidaa darteed, ka dib marka iftiinka ultraviolet uu ka soo baxo chips, waxaa nuugaya saddexda fosfoor ee midabka aasaasiga ah ee lakabka daboolaya, iyo photoluminescence ee fosfooraska ayaa loo beddelaa iftiin cad, ka dibna ku sii deynaya meel bannaan. Tani waa faa'iidada ugu weyn, sida nalalka dhaadheer ee dhaqameed, ma laha sinnaansho midab meel bannaan. Si kastaba ha ahaatee, saamaynta iftiinka aragtida ah ee ultraviolet chip nooca cad ee LED ma noqon karto mid ka sarreeya qiimaha aragtida ah ee nooca buluuga ah ee nalka cad, waxayna u badan tahay inay ka sarreyso qiimaha aragtida RGB nooca iftiinka cad. Si kastaba ha ahaatee, kaliya iyada oo loo marayo horumarinta fosfooraska trichromatic waxtarka sare leh ee ku habboon kicinta iftiinka ultraviolet waxaa suurtagal ah in la helo LED-yada cad ee nooca ultraviolet ee u dhow ama xitaa ka waxtar badan marka loo eego labada LEDs cad ee hadda. U dhowaanshaha nalalka buluuga ah ee iftiinka ultraviolet, suurtagalnimada Inta badan ee weyn ee mowjadaha dhexdhexaadka ah iyo nooca ultraviolet-gaaban ee LED-yada, ayaa ah mid aan macquul ahayn.