Wuhan University pab pawg tshawb fawb tshiab: liab Mini LED ua haujlwm tau nce 30%

Tsis ntev los no, pab pawg Zhou Shengjun ntawm Wuhan University tau tsim ib txheej tshiab Schottky-contact intrinsic current blocking layer (SCBL), uas tuaj yeem txhim kho qhov tam sim no diffusion hauv thaj chaw nquag. Thiab txhim kho qhov ua tau zoo ntawm lub teeb rho tawm ntawm AlGaInP liab. Mini LED(LEE).

Daim duab saum toj no qhia (a) cov qauv ntaus ntawv, thiab (b) cov txheej txheem tsim khoom raws li AlGaInP lub teeb liab ntsug qauv Mini Led nrog SCBL. (c) SCBL thiab (d) AlGaInP raws li lub teeb liab ntsug qauv Mini LED sab saum toj saib opticallub tshuab tsom iavcov duab.

Tus thawj coj tshawb fawb Shengjun Zhou tau hais tias pab neeg tau siv cov khoom sib cuag Schottky ntawm indium tin oxide (ITO) thiab p-GaP, nrog rau cov khoom sib cuag ohmic ntawm ITO thiab p-GaP + los tsim SCBL, uas tau pom los ntawm txoj kev hloov pauv ntev.

Zhou Shengjun tau hais tias SCBL tuaj yeem txo qhov tam sim no nyob ib puag ncig lub electrode p thiab txhawb kev sib kis tam sim no, yog li txhim kho kev rho tawm lub teeb ntawm AlGaInP liab Mini LED. Vim muaj kev sib kis tam sim no thiab kev rho tawm lub teeb, Mini leds nrog SCBL qhia txog kev faib tawm ntawm lub zog ci ntsa iab, lub zog tso zis optical siab dua, thiab kev ua haujlwm quantum sab nraud siab dua (EQE).

AlGaInP liab Mini LED yog siv dav ua ib feem tseem ceeb ntawm cov xim puv npo cov zaub vim nws lub teeb ci ntsa iab, kev siv hluav taws xob tsawg thiab lub neej ntev.

Txawm li cas los xij, tam sim no nyob ib puag ncig lub p electrode ua rau muaj kev faib tawm tam sim no tsis sib npaug hauv thaj chaw nquag. Tsis tas li ntawd, vim tias feem ntau ntawm cov photons tsim nyob rau hauv thaj chaw nquag raug nqus lossis cuam tshuam los ntawm cov hlau opaque p electrode, qhov ua tau zoo ntawm lub teeb rho tawm (LEE) ntawm AlgainP-based Mini LED yog qis.

Yuav kom daws tau qhov teeb meem no, cov kws tshawb fawb tau qhia txog SCBL los txhim kho qhov tam sim no diffusion thiab lub teeb extraction ntawm AlgainP-based Mini leds. Los ntawm kev siv Schottky contacts ntawm ITO thiab P-gap, SCBL tuaj yeem tiv thaiv tam sim no crowding nyob ib ncig ntawm p electrode. Tam sim no raug yuam mus rau hauv thaj chaw nquag los ntawm P-GAP + ohmic contact txheej kom tsis txhob nqus thiab cuam tshuam ntawm lub teeb los ntawm opaque hlau p electrode.

Cov txiaj ntsig tau qhia tias qhov ua tau zoo sab nraud (EQE) ntawm AlGaInP raws li Mini LED siv SCBL tuaj yeem nce ntxiv txog li 31.8% ntawm qhov tam sim no ntawm 20mA piv rau AlGaInP raws li Mini LED tsis muaj SCBL. Yog li ntawd, SCBL thev naus laus zis yuav tsum tau siv rau kev tsim khoom loj ntawm AlgainP-raws li liab Mini LED yav tom ntej.

Nws yog ib qho tsim nyog sau tseg tias pab pawg Zhou Shengjun ntawm Wuhan University kuj tau tshaj tawm ntau cov txiaj ntsig tshawb fawb LED tshiab. Piv txwv li, hauv thaj chaw ntawm cov teeb pom kev zoo ultraviolet tob, pab pawg tau qhia txog Algan-based ultra-thin tunnel junction (26 nm) hauv cov teeb pom kev zoo ultraviolet tob, uas ua rau muaj kev hloov pauv electro-optical ntawm cov teeb pom kev zoo ultraviolet tob los ntawm 5.5%.

Hauv kev ua haujlwm ntawm Mini LED, pab neeg tau txhim kho kev ua haujlwm ntawm cov chips xiav thiab ntsuab flip Mini LED los ntawm kev siv Full-angle Distributed Bragg Reflector (DBR). Nyob rau hauv qhov xwm txheej ntawm 10mA txhaj tshuaj tam sim no, lub zog tso zis optical ntawm xiav thiab ntsuab Mini LED raws li ITO / DBR yog nce ntxiv txog li 7.7% thiab 7.3%, raws li.