Tsis ntev los no, Xib Fwb Xiao Zhengguo cov kev tshawb fawb pab neeg los ntawm Lub Tsev Kawm Ntawv ntawm Physics ntawm University of Science thiab Technology ntawm Tuam Tshoj, Lub Tsev Haujlwm Tseem Ceeb ntawm Kev Sib Koom Tes Quantum Material Physics ntawm Suav Academy ntawm Kev Tshawb Fawb thiab Hefei National Research Center for Microscale Material Science tau ua qhov tseem ceeb. kev vam meej nyob rau hauv lub tshav pob ntawm kev npaj npaum thiab ruaj khov perovskite ib leeg siv lead uaLEDs.

Pab pawg tshawb fawb tau loj hlob zoo, thaj chaw loj thiab ultra-nyias perovskite ib leeg siv lead ua los ntawm kev siv txoj kev txwv qhov chaw, thiab npaj perovskite ib leeg siv lead ua LED nrog qhov ci ci ntawm ntau dua 86000 cd / m2 thiab lub neej ntev txog 12500 h. thawj zaug, uas tau ua ib kauj ruam tseem ceeb ntawm daim ntawv thov ntawm perovskite LED rau tib neegteeb pom kev zoo. Cov txiaj ntsig tseem ceeb, hu ua "High ci thiab ruaj khov ib leeg-crystal perovskite lub teeb-emitting diodes", tau tshaj tawm hauv Nature Photonics thaum Lub Ob Hlis 27.

Hlau halide perovskite tau dhau los ua ib lub cim tshiab ntawm LED zaub thiab cov khoom siv teeb pom kev zoo vim nws lub wavelength tunable, nqaim ib nrab-peak dav thiab qis-kub npaj. Tam sim no, sab nraud quantum efficiency (EQE) ntawm perovskite LED (PeLED) raws li polycrystalline nyias zaj duab xis tau tshaj 20%, piv rau cov lag luam organic LED (OLED). Nyob rau hauv xyoo tas los no, cov kev pab cuam lub neej ntawm feem ntau ntawm high-efficiency perovskite qhiaCov khoom siv LEDnyob ntawm ntau pua mus rau ntau txhiab teev, tseem poob qab OLEDs. Kev ruaj ntseg ntawm cov cuab yeej yuav raug cuam tshuam los ntawm cov yam ntxwv xws li ion txav, tsis sib npaug ntawm cov khoom siv cog qoob loo thiab joule cua sov tsim thaum lub sijhawm ua haujlwm. Tsis tas li ntawd, qhov loj Auger recombination nyob rau hauv polycrystalline perovskite li kuj txwv lub brightness ntawm cov khoom siv.

Hauv kev teb rau cov teeb meem saum toj no, Xiao Zhengguo pab pawg tshawb fawb tau siv txoj hauv kev txwv qhov chaw kom loj hlob perovskite ib leeg muaju rau ntawm cov substrate hauv qhov chaw. Los ntawm kev kho cov kev loj hlob, qhia txog cov organic amines thiab polymers, cov khoom siv lead ua zoo tau txhim kho zoo, yog li npaj cov khoom siv zoo MA0.8FA0.2PbBr3 nyias nyias nyias nyias nrog qhov tsawg kawg nkaus thickness ntawm 1.5 μ m. Qhov saum npoo roughness tsawg dua 0.6 nm, thiab fluorescence quantum yield (PLQYINT) nce mus txog 90%. Lub perovskite ib leeg siv lead ua LED khoom npaj nrog nyias ib leeg siv lead ua raws li lub teeb emitting txheej muaj EQE ntawm 11.2%, lub ci ci ntawm ntau tshaj 86000 cd / m2, thiab lub neej ntawm 12500 h. Nws tau pib mus txog qhov pib ntawm kev lag luam, thiab tau dhau los ua ib qho ntawm cov khoom siv ruaj khov perovskite LED tam sim no.

Cov hauj lwm saum toj no qhia tau hais tias siv nyias perovskite ib leeg siv lead ua raws li lub teeb emitting txheej yog ib qho kev daws teeb meem rau qhov teeb meem kev ruaj ntseg, thiab tias perovskite ib leeg siv lead ua LED muaj kev cia siab zoo hauv thaj chaw ntawm tib neeg lub teeb pom kev zoo thiab cov zaub.