1. Chip LED-ka buluuga ah + fosfoor cagaaran oo jaale ah, oo ay ku jiraan soosaarida fosfoor polychrome

Lakabka fosfoorka cagaaran ee jaalaha ah wuxuu nuugaa iftiinka buluuga ah ee qaarchips LEDsi loo soo saaro photoluminescence, iyo iftiinka buluugga ah ee chips-ka LED-ka ayaa ka soo baxa lakabka fosfooraska oo isku dhejinaya iftiinka cagaarka ah ee jaalaha ah ee fosfoorka ee meelo kala duwan oo meel bannaan ah, iyo iftiinka buluugga cagaaran ee casaanka ah ayaa isku dhafan si ay u sameeyaan iftiin cad; Sidan oo kale, qiimaha ugu sarreeya ee aragtida wax ku oolnimada beddelka photoluminescence ee fosfoor, mid ka mid ah waxtarka tirada dibadda, kama badan doono 75%; Heerka ugu sarreeya ee iftiinka ka soo baxa chip wuxuu gaari karaa oo keliya 70%. Sidaa darteed, aragti ahaan, waxtarka ugu sarreeya ee iftiinka buluuga ah ee iftiinka buluuga ah kama badan doono 340 Lm/W, CREE waxay gaari doontaa 303 Lm / W dhowr sano ka hor. Haddii natiijooyinka imtixaanku ay sax yihiin, waxaa habboon in la dabaaldego.

2. Cagaaran casaanka ah ee saddexda midab ee aasaasiga ah ee RGB LED nooca, oo ay ku jiraan RGB W LED nooca, iwm

SaddexdaiftiimayaDiodes, R-LED (casaan)+G-LED (cagaaran)+B-LED (buluug), ayaa la isku daray si ay u sameeyaan iftiin cad iyagoo si toos ah u qasaya iftiinka casaanka, cagaarka iyo buluugga ah ee ka baxaya meel bannaan. Si loo dhaliyo wax ku oolnimada sare ee iftiinka cad ee habkan, marka hore, dhammaan LED-yada midabka, gaar ahaan LED-yada cagaaran, waa inay ahaadaan ilo iftiin waxtar leh, taas oo xisaabisa qiyaastii 69% "iftiin cad oo siman". Waqtigan xaadirka ah, hufnaanta iftiinka LED-ka buluugga ah iyo LED-ka cas ayaa aad u sarreeya, iyada oo waxtarka gudaha gudaha uu ka sarreeyo 90% iyo 95% siday u kala horreeyaan, laakiin waxtarka gudaha gudaha ee LED-ka cagaaran ayaa aad uga dambeeya. Dhacdadan waxtarka iftiinka cagaaran ee hooseeya ee GaN ku salaysan LED waxaa loo yaqaan "farqiga iftiinka cagaaran". Sababta ugu weyn ayaa ah in LED-ga cagaaran uusan wali helin walxaha epitaxial u gaar ah. Hufnaanta agabka taxanaha ah ee arsenic nitride fosfooraska ee jira aad ayuu u hooseeyaa marka loo eego kala duwanaanshaha chromatographic cagaaran ee jaalaha ah. Si kastaba ha ahaatee, LED-ga cagaaran wuxuu ka samaysan yahay nalka cas ama nalka buluuga ah ee epitaxial. Marka la eego xaaladda cufnaanta hoose ee hadda jirta, sababtoo ah ma jiro lumin beddelka fosfooraska, LED-ka cagaaran wuxuu leeyahay waxtarka iftiinka sare ee iftiinka buluugga ah + iftiinka cagaaran ee fosfooraska. Waxaa lagu soo waramayaa in waxtarkeeda iftiinka ahi uu gaaro 291Lm/W oo hoos yimaada 1mA hadda. Si kastaba ha ahaatee, marka la eego hadda sare, waxtarka iftiinka cagaaran ee iftiinka cagaaran ee uu keeno saameynta Droop ayaa si weyn hoos ugu dhacaysa. Marka cufnaanta hadda korodho, waxtarka iftiinka ayaa si degdeg ah hoos u dhacaya. Marka la eego 350mA hadda, waxtarka iftiinka waa 108Lm/W, iyo xaalad 1A, waxtarka iftiinka ayaa hoos u dhacaya 66Lm/W.

Kooxda III phosphides, iftiiminta iftiinka kooxda cagaaran waxay noqotay caqabada aasaasiga ah ee nidaamka walxaha. Beddelidda ka kooban AlInGaP si ay u iftiimiso iftiinka cagaarka halkii casaan, oranji ama jaalle ah - oo keenaysa xaddidid ku filnaan la'aanta sideyaasha waxaa sabab u ah farqiga tamarta yar ee nidaamka maaddooyinka, taas oo meesha ka saaraysa dib-u-habaynta shucaaca waxtarka leh.

Taas bedelkeeda, way ku adag tahay Kooxda III nitrides inay gaadhaan waxtar sare, laakiin dhibtu maaha mid laga gudbi karo. Marka nalka lagu kordhiyo band-ga cagaaran ee nidaamkan leh, labada arrimood ee hoos u dhigi doona waxtarka ayaa ah waxtarka tirada dibadda iyo waxtarka korontada. Hoos u dhaca waxtarka tirada dibadda waxay ka timaaddaa xaqiiqda in kasta oo farqiga band cagaaran uu hooseeyo, LED-ga cagaaran waxay isticmaashaa koronta hore ee GaN, taas oo yaraynaysa heerka beddelka awoodda. Khasaaraha labaad waa cagaarkaasLED-ka ayaa yaraadaiyada oo korodhka cufnaanta hadda la isku duro oo ay ku xayiran tahay saamaynta hoos u dhaca. Saamaynta hoos u dhaca ayaa sidoo kale ka muuqata LED buluug ah, laakiin aad ayey ugu daran tahay LED-ka cagaaran, taasoo keentay hoos u dhac ku yimaada shaqada caadiga ah ee hadda jirta. Si kastaba ha ahaatee, waxaa jira sababo badan oo saameeya hoos u dhaca, ma aha oo kaliya dib u habeynta Auger, laakiin sidoo kale kala-baxa, qulqulka side ama daadinta elektaroonigga ah. Midda dambe waxaa lagu xoojiyay koronto gudaha ah oo koronto ah.

Sidaa daraadeed, siyaabaha lagu hagaajinayo waxtarka iftiinka iftiinka ee LED-ka cagaaran: dhinaca kale, baro sida loo yareeyo saameynta Droop si loo hagaajiyo waxtarka iftiinka ee shuruudaha qalabka epitaxial ee jira; Dhanka kale, LED-ka buluuga ah iyo fosfoor cagaaran ayaa loo isticmaalaa beddelka iftiinka iftiinka si loo sii daayo iftiinka cagaaran. Habkani wuxuu heli karaa iftiin cagaaran oo leh waxtar sare oo iftiin leh, kaas oo aragti ahaan lagu gaari karo waxtarka iftiinka sare ee iftiinka cad ee hadda jira. Waxay iska leedahay iftiinka cagaarka ah ee aan iskiis u dhicin. Hoos-u-dhaca nadiifnimada midabka ee ay sababtay fidinta muuqaalkiisa ayaa ah mid aan ku habboonayn soo bandhigida, laakiin dhib kuma aha iftiinka caadiga ah. Waa suurtagal in la helo waxtarka iftiinka cagaaran ee ka weyn 340 Lm / W, Si kastaba ha ahaatee, iftiinka cad ee isku dhafan kama badnaan doono 340 Lm / W; Seddexaad, sii wad baaritaanka oo hel qalabkaaga epitaxial. Sidan oo keliya ayaa jiri kara rajo rajo ah in ka dib markii 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 ka sarreeyaan xadka waxtarka iftiinka ee chip blue LED cad oo ah 340 Lm/W.

3. Chip LED-ka Ultraviolet + fosfoor midab leh

Ciladda ugu weyn ee ka jirta labada nooc ee kor ku xusan ee LED-ka cad waa in qaybinta iftiinka iyo chroma ay tahay mid aan sinnayn. Iftiinka UV waa mid aan la arki karin isha aadanaha. Sidaa darteed, iftiinka UV ee ka soo baxaya chip-ka waxaa nuugaya fosfoor saddex midab ah oo lakabka baakadka ah, ka dibna laga beddelo iftiinka phosphor ee iftiinka cad oo u soo baxaya meel bannaan. Tani waa faa'iidada ugu weyn, sida laambad-dhaqameedka fluorescent, ma laha midab meel bannaan oo aan sinnayn. Si kastaba ha noqotee, hufnaanta aragtida iftiinka ultraviolet chip nooca cad ee LED kama sarreyn karto qiimaha aragtida ee nooca chip blue nalka cad, iska daa qiimaha aragtida ee nooca RGB iftiinka cad. Si kastaba ha noqotee, kaliya adoo horumarinaya fosfooraska tricolor hufan ee ku habboon kicinta iftiinka UV waxay suurtagal noqon kartaa in la helo ultraviolet cad LED oo leh iftiin la mid ah ama xitaa ka sarreeya labada LEDs cad ee kor ku xusan marxaladdan. Sida ugu dhow ee ultraviolet LED waa iftiinka buluuga ah, waxay u badan tahay inay noqoto, LED-ka cad ee leh mowjad dhexdhexaad ah iyo khadadka ultraviolet gaaban ayaa noqon doona mid aan macquul ahayn.